1. COMPOUND INTEREST CALCULATOR
Intro (above calculator)
Headline: See Exactly How Your Money Grows Over Time
Compound interest is the reason a dollar saved at 25 is worth far more than a dollar saved at 45. It's also why Einstein reportedly called it the "eighth wonder of the world." Whether or not he said it, the math is remarkable.
When you earn interest on your original principal and on the interest already earned, growth accelerates over time. The longer the runway, the more dramatic the effect. A $10,000 investment growing at 7% annually becomes $76,000 over 30 years — not $31,000 as it would with simple interest.
This calculator shows you exactly how your money grows based on four variables: starting amount, monthly contributions, annual interest rate, and time. Adjust any slider and watch the projection update in real time.
How to Use (below calculator)
How to use this calculator:
Starting amount — Enter what you have invested or saved today. If you're starting from zero, set this to $0.
Monthly contribution — How much you plan to add each month. Even $50/month makes a significant long-term difference.
Annual interest rate — Historical US stock market average is roughly 7% (inflation-adjusted) or 10% (nominal). For savings accounts, use the current rate your bank offers.
Time period — How many years you plan to let the money grow.
What the results mean:
Final balance — The total projected value at the end of your timeframe
Total contributed — The actual dollars you put in
Interest earned — The growth generated by compounding — the "free" money
Frequently asked questions:
What interest rate should I use? For long-term stock market investments, financial planners commonly use 6–7% (inflation-adjusted) or 9–10% (nominal, before inflation). For a high-yield savings account, use your current account rate. For a conservative estimate, use 5%.
How does compounding frequency affect the result? Daily compounding earns slightly more than monthly, which earns more than annual. Most investment accounts compound monthly or daily. The difference is modest but meaningful over very long periods.
Why does starting early matter so much? Because early years generate interest that itself compounds in later years. Money invested at 25 has 40 years to multiply. The same dollar invested at 35 has only 30. This 10-year gap is worth hundreds of thousands of dollars by retirement.
2. BUDGET CALCULATOR
Intro (above calculator)
Headline: Build a Budget That Reflects Your Real Life
Most budgets fail not because people lack discipline, but because the budget never matched reality in the first place. A budget built on wishful thinking about grocery costs or transportation expenses will be abandoned within weeks.
This calculator starts with what you actually earn and helps you allocate it clearly across needs, wants, and savings — using the proven 50/30/20 framework as a starting guide. Needs (rent, utilities, groceries, minimum debt payments) should account for roughly 50% of after-tax income. Wants (dining, entertainment, subscriptions) around 30%. Savings and debt payoff: 20%.
Adjust the categories to match your real spending, and see in real time whether your budget is balanced — and how much room you have to save each month.
How to Use (below calculator)
How to use this calculator:
Monthly take-home income — Enter your after-tax income. If paid biweekly, multiply your paycheck by 26 and divide by 12.
Fixed expenses — Rent, mortgage, car payments, insurance, minimum debt payments. These don't change month to month.
Variable expenses — Groceries, utilities, gas, dining, entertainment. Use your real average, not your ideal.
Savings goals — Emergency fund, retirement contributions, investment accounts.
What to look for: If your needs exceed 50% of income, housing or transportation costs may need to be addressed. If savings is near zero, look for the largest discretionary categories first — dining and subscriptions are typically the highest-leverage cuts.
Frequently asked questions:
What is the 50/30/20 rule? A budgeting framework that allocates 50% of after-tax income to needs, 30% to wants, and 20% to savings and debt repayment. It's a starting point, not a rigid rule — adjust based on your income, location, and goals.
What's the difference between a need and a want? A need is something required for basic functioning and work: housing, basic food, utilities, transportation to work, minimum debt payments. A want is everything else. Netflix, restaurants, new clothes, hobbies — these are wants, not needs, even if they feel essential.
I can't save 20% — what should I do? Start wherever you can. Even 5% saved consistently is better than 0%. As income grows or fixed expenses decrease, ratchet up the savings rate. Automating any amount — even $25/month — builds the habit.
3. INFLATION CALCULATOR
Intro (above calculator)
Headline: What Is Your Money Actually Worth Over Time?
Inflation is sometimes called the "invisible tax" — it quietly reduces the purchasing power of money without anyone sending you a bill. Something that cost $100 in 2010 costs about $155 today. The dollar didn't disappear; it just buys less.
Understanding the real impact of inflation is essential for financial planning. It affects how much you actually need in retirement, whether your savings account is growing or shrinking in real terms, and how to evaluate investment returns honestly.
This calculator shows exactly how inflation erodes purchasing power over any timeframe — or conversely, how much a future dollar amount is worth in today's terms.
How to Use (below calculator)
How to use this calculator:
Starting amount — The dollar amount you want to evaluate (current savings, future retirement target, cost of a planned purchase)
Annual inflation rate — US inflation has averaged roughly 3% over the long run. The Fed targets 2%. Use 3% for conservative long-term planning; adjust based on current conditions.
Time period — How many years into the future you're projecting.
What the results show:
Future value — What today's amount would need to grow to in order to have the same purchasing power
Real value — What a future dollar amount is worth in today's purchasing power
Frequently asked questions:
What inflation rate should I use for planning? For long-term financial planning, 3% is the most commonly used assumption. For near-term projections (1–3 years), current inflation data from the Bureau of Labor Statistics provides a more accurate starting point.
Why does inflation matter for my savings account? If your savings account earns 1% annually and inflation runs at 3%, your money is losing 2% of purchasing power each year in real terms — even as the nominal balance grows. This is why keeping large amounts of cash long-term is a wealth-erosion strategy.
How does inflation affect retirement planning? Significantly. A $1 million portfolio at retirement has very different purchasing power depending on whether it was planned with or without inflation adjustment. Always plan in real (inflation-adjusted) dollars, not nominal ones.
4. RETIREMENT CALCULATOR
Intro (above calculator)
Headline: Are You on Track to Retire? Find Out in 60 Seconds.
Most people don't know whether they're saving enough for retirement. Financial planners often cite a target of 10–15% of income — but the right number depends entirely on when you start, how much you already have, and what lifestyle you want in retirement.
This calculator gives you a personalized answer. Enter your age, current savings, monthly contribution, expected return rate, and retirement age — and see your projected nest egg, monthly retirement income (based on the 4% safe withdrawal rate), and how inflation will affect the real value of your savings.
Adjust the sliders to see how small changes — an extra $100/month, retiring two years later, one additional percentage point of return — compound into dramatically different outcomes.
How to Use (below calculator)
How to use this calculator:
Current age and retirement age — Sets your investment timeline. Every additional year of growth has an outsized effect.
Current savings — Your existing retirement accounts (401k, IRA, brokerage investments). Don't include emergency funds or money you plan to spend before retirement.
Monthly contribution — What you're adding each month across all retirement accounts. Include employer matching contributions.
Annual return rate — Financial planners typically use 6–7% for conservative projections, 8–10% for more optimistic. Adjust based on your asset allocation.
Inflation rate — Used to calculate the "real value" of your future balance in today's dollars.
Retirement duration — How many years you expect to spend in retirement. At 65, US life expectancy is roughly 85+.
Frequently asked questions:
How much do I need to retire? The 4% rule suggests you can sustainably withdraw 4% of your portfolio annually. Divide your desired annual retirement income by 0.04 to find your target. For $60,000/year: $60,000 ÷ 0.04 = $1.5 million.
What's a realistic return rate assumption? The S&P 500 has averaged roughly 10% annually over the long run (7% inflation-adjusted). A diversified portfolio with some bonds might average 6–8%. For conservative planning, 6–7% is widely used by financial planners.
What if I'm behind on retirement savings? Increasing your contribution rate — even by 1–2% — has a significant impact compounded over time. Also check that you're capturing any employer match in full; that's the highest-return action available regardless of starting balance.
5. DEBT PAYOFF CALCULATOR
Intro (above calculator)
Headline: See Exactly When You'll Be Debt-Free — And How Much You'll Save
Most people know their monthly debt payment. Far fewer know how many years they'll be paying — or what the total interest cost actually is. A $5,000 credit card balance at 22.99% APR with minimum payments only takes over 15 years to clear and costs more than $8,000 in total interest.
This calculator changes that. Add every debt you carry, choose the avalanche (highest interest first) or snowball (smallest balance first) strategy, set an extra monthly payment, and see your complete payoff timeline — debt by debt, with exact dates and total interest saved.
Understanding the real cost of your debt is the first step to eliminating it efficiently.
How to Use (below calculator)
How to use this calculator:
Add your debts — Name, current balance, and APR for each. Include all credit cards, car loans, student loans, personal loans.
Choose a strategy:
Avalanche — Attacks the highest-interest debt first. Saves the most money mathematically.
Snowball — Attacks the smallest balance first. Creates early wins that build motivation.
Extra monthly payment — Any amount above your minimums dramatically accelerates payoff. Even $50–$100/month matters.
See your results — Total interest saved, payoff date, and the exact order each debt gets eliminated.
Frequently asked questions:
Which is better: avalanche or snowball? Avalanche saves more money. Snowball builds more momentum. Research suggests snowball leads to better real-world follow-through for people who've struggled with debt payoff before. The best strategy is the one you'll actually stick to.
How much does one extra payment per year save? On a $200,000 mortgage at 6.5%, making one extra payment annually saves approximately $37,000 in interest and cuts about 4 years off the loan. Extra payments are most powerful on high-interest debt.
Should I pay off debt or invest? For debt above ~8–10% interest: pay it off first. The guaranteed return of eliminating high-interest debt typically beats expected investment returns on a risk-adjusted basis. For low-interest debt (under 5%): invest while making minimum payments. For rates in between: often worth doing both.
6. MORTGAGE CALCULATOR
Intro (above calculator)
Headline: What Will Your Mortgage Really Cost? See the Full Picture.
The monthly mortgage payment shown on Zillow is only part of the story. Your actual monthly housing cost includes property taxes, homeowner's insurance, and ongoing maintenance — often adding $500–$1,000 or more to the base payment. And over a 30-year loan, total interest paid frequently exceeds the original purchase price.
This calculator shows your complete mortgage picture: true monthly cost, total interest, a year-by-year amortization schedule, and a breakdown of where every dollar goes. Adjust for any home price, down payment, interest rate, and loan term to model different scenarios before you commit.
How to Use (below calculator)
How to use this calculator:
Home price — The purchase price of the home
Down payment — 20% eliminates PMI; lower down payments are possible with FHA and conventional loans
Loan term — 30-year is most common; 15-year has higher payments but dramatically less total interest
Interest rate — Use current market rates; check with multiple lenders, as rates vary significantly
Property tax — Find your county's property tax rate; multiply by home value for the annual amount
Home insurance — Typically $1,200–$3,000/year; higher in disaster-prone areas
Switch between Chart, Annual, and Monthly views to see the amortization in different formats
Frequently asked questions:
What does amortization mean? Amortization is the process of paying off a loan through regular payments. In the early years, most of each payment goes to interest. In later years, more goes to principal. This is why extra early payments are so powerful — they save the interest that would have compounded on that principal for decades.
How much does a lower interest rate save? A 0.5% rate reduction on a $350,000 30-year mortgage saves approximately $35,000 in total interest. This is why shopping multiple lenders and improving your credit score before buying are worth significant effort.
When does PMI go away? Private Mortgage Insurance cancels automatically when your loan-to-value ratio reaches 80% (you've paid down to 80% of the original home value). You can request cancellation at this point; lenders are legally required to cancel it at 78% LTV automatically.
7. TAX BRACKET CALCULATOR
Intro (above calculator)
Headline: Your Real Tax Rate Is Probably Lower Than You Think
Most people misunderstand how tax brackets work. Being in the "22% bracket" doesn't mean you pay 22% on all your income — it means you pay 22% only on the portion of income that falls within that bracket. Your effective tax rate (what you actually pay as a percentage of total income) is almost always lower than your marginal rate.
This calculator breaks down exactly how much income falls into each bracket, how much tax you pay at each rate, and what your real take-home pay looks like after federal income tax and FICA. Enter your salary, filing status, pre-tax deductions, and see a color-coded bracket breakdown updated instantly.
How to Use (below calculator)
How to use this calculator:
Gross annual income — Your total pre-tax salary or self-employment income
Filing status — Single, Married Filing Jointly, Married Filing Separately, or Head of Household. Filing status significantly affects which brackets apply.
Tax year — 2025 or 2026 brackets. The IRS adjusts brackets annually for inflation.
Pre-tax deductions — 401(k) contributions, HSA contributions, and other pre-tax deductions reduce your taxable income before brackets are applied.
Standard vs. itemized deduction — The standard deduction for 2026 is $15,700 (single) or $31,400 (married filing jointly). Only itemize if your deductible expenses exceed these amounts.
Frequently asked questions:
What's the difference between marginal and effective tax rate? Your marginal rate is the rate that applies to your last dollar of income — the bracket you're "in." Your effective rate is total tax paid divided by total income. Someone in the 22% bracket almost always has an effective rate of 14–17%.
Do 401(k) contributions really reduce my taxes? Yes, significantly. Traditional 401(k) contributions reduce your adjusted gross income dollar for dollar. Someone in the 22% bracket who contributes $10,000 to their 401(k) saves $2,200 in federal income tax in that year — plus state income tax in most states.
What is FICA tax? FICA stands for Federal Insurance Contributions Act — it funds Social Security and Medicare. The combined rate is 7.65% for employees (employers pay another 7.65%). Unlike income tax, there's no standard deduction offsetting FICA — it applies from the first dollar of earned income.
8. NET WORTH TRACKER
Intro (above calculator)
Headline: Your Net Worth Is Your Financial Scoreboard. Start Tracking It.
Income tells you how much is flowing in. Net worth tells you whether you're actually building wealth. You can earn a high salary and still have a negative or stagnant net worth — and you can earn a modest salary and steadily build significant wealth. The difference is what you do with the gap between earning and spending.
Net worth is simple: assets minus liabilities. Everything you own that has monetary value, minus everything you owe. Add a snapshot monthly or quarterly and watch the trend — that trend is the truest measure of your financial progress over time.
This tracker stores your snapshots and shows your net worth chart over time. Your data stays in your browser — nothing is sent to a server.
How to Use (below calculator)
How to use this calculator:
Add your assets — Checking and savings balances, investment accounts, retirement accounts (401k, IRA), home value (current market value, not purchase price), vehicle value (current resale value)
Add your liabilities — Mortgage balance, car loan balance, student loans, credit card balances, any personal loans
Save a snapshot — The tracker saves your entry with today's date
Return monthly — Update the numbers each month or quarter to see your trajectory
What to include (and what to skip): Include financial accounts, real estate, and vehicles. Skip personal property like furniture, clothing, and electronics — these are difficult to value accurately and rarely significant.
Frequently asked questions:
What's a good net worth for my age? Common benchmarks: by 30, approximately 1× annual salary. By 40, 3–4×. By 50, 5–7×. By 65, 10–12×. These are rough guides, not verdicts — trajectory matters more than any point-in-time comparison.
My net worth is negative. Is that normal? Very common, particularly in your 20s with student loan debt. A negative net worth combined with an upward trend (improving month over month) is a much healthier position than a high net worth that's declining.
Should I include my home in net worth? Yes, at current market value. But treat it carefully — it's an illiquid asset you can't easily access without selling or borrowing against. Many financial planners track home equity separately from investable net worth.
9. SAVINGS GOAL CALCULATOR
Intro (above calculator)
Headline: How Long Until You Hit Your Goal? Find Out in Seconds.
Whether you're saving for an emergency fund, a home down payment, a car, a vacation, or a wedding — the math is the same: how much, how long, and how much per month. This calculator works both ways: tell it your monthly savings and it shows when you'll hit your goal. Or tell it your timeline and it tells you what you need to save each month.
Adjust for interest earned on your savings (high-yield savings accounts currently offer 4–5%) and see how much faster compound growth accelerates your timeline.
How to Use (below calculator)
How to use this calculator:
Choose a goal preset or enter a custom amount — preset options include emergency fund, vacation, down payment, car, wedding, and college fund
Enter current savings — What you've already set aside toward this goal
Choose your mode:
How much per month? — Enter your monthly savings and see when you'll hit the goal
How long will it take? — Enter a target date and see the required monthly contribution
Annual interest rate — For money in a high-yield savings account, use your current rate (typically 4–5% in the current environment)
Frequently asked questions:
Where should I keep savings goal money? In a high-yield savings account (HYSA) separate from your everyday checking. The separation prevents accidental spending; the higher rate accelerates the timeline. Don't invest goal money you'll need within 3 years — market volatility makes the outcome unreliable.
How much should an emergency fund be? 3–6 months of essential living expenses (rent, utilities, groceries, minimum debt payments, transportation). If you're self-employed or have a single income household, lean toward 6+ months. See our full emergency fund guide for the complete framework.
I have multiple savings goals — how do I prioritize? Emergency fund first (always). Then employer 401(k) match (free money). Then goals by timeline and importance. For longer-term goals, higher-yield options (CDs, money market accounts, investments for 5+ year goals) may be appropriate.
10. RENT VS. BUY CALCULATOR
Intro (above calculator)
Headline: Renting vs. Buying: What Does the Math Actually Say for Your Situation?
The rent vs. buy decision is one of the most financially significant choices most people make — and it's one where national headlines are almost always misleading. Whether renting or buying makes more financial sense depends entirely on your local market, your timeline, your down payment, and what you'd do with the money if you rented instead.
This calculator models both paths using your real numbers. It accounts for opportunity cost (what the down payment could earn if invested), appreciation, rent increases, mortgage principal paid down, property taxes, maintenance, and insurance — and shows you the true net cost of each option over your chosen timeline.
How to Use (below calculator)
How to use this calculator:
Time horizon — The most important input. If you'll move in under 5 years, buying is almost never cheaper after accounting for transaction costs.
Home appreciation rate — Historical US average is 3–4% annually. Varies significantly by market.
Investment return rate — What the down payment could earn if invested instead of used for real estate. 7% is a commonly used long-term market return.
Renting inputs — Current rent, annual increases, security deposit, renter's insurance
Buying inputs — Home price, down payment %, mortgage rate, property tax, insurance, maintenance
Frequently asked questions:
When does buying almost always win? When you're staying 7+ years, in a market where monthly ownership costs are within 30–35% of gross income, and when you have a full down payment plus 3–6 months emergency fund remaining after closing.
When does renting almost always win? High-cost coastal markets where equivalent rents are far below mortgage costs on comparable homes. Short timelines under 5 years. When the down payment would exhaust liquid savings. When income or location is uncertain.
What is the breakeven timeline? The number of years you need to own a home before buying becomes cheaper than renting — accounting for upfront transaction costs (typically 2–5% of purchase price). In expensive markets this can be 10–15 years. In affordable markets, as short as 3–5 years.
11. 401(K) CONTRIBUTION CALCULATOR
Intro (above calculator)
Headline: How Much Should You Contribute to Your 401(k)?
The contribution rate you set on your first day of employment is often the rate you're still contributing years later — even as income has grown, tax situations have changed, and employer match terms have been updated. Most people are leaving significant money on the table without realizing it.
This calculator shows the full picture of your 401(k) decision: what it costs in take-home pay, how much employer matching money you're capturing (or missing), the tax savings from pre-tax contributions, and what your projected balance looks like at retirement. Includes 2026 IRS contribution limits and quick-select scenarios from "capture the match" to "maximize everything."
How to Use (below calculator)
How to use this calculator:
Annual salary — Your gross yearly income
Contribution rate — The percentage of salary you contribute. Use the Quick Scenarios below to jump to common benchmarks.
Employer match — Enter your employer's match percentage and the salary percentage they match up to. Check your plan documents if unsure.
Tax bracket — Your federal marginal rate. Used to calculate tax savings from pre-tax contributions.
Age and retirement timeline — Determines how many years your contributions compound before retirement.
Current balance — What you've already accumulated across all 401(k) accounts.
Frequently asked questions:
How much should I contribute to my 401(k)? At minimum, enough to capture the full employer match — that's the highest-return action available to most employees. Beyond that, financial planners often recommend 15% of gross income (including employer match) as a retirement savings target.
What's the 2026 401(k) contribution limit? $24,500 for those under 50. $32,500 for those 50 and older (including catch-up). Ages 60–63 have a special "super catch-up" limit of $35,750.
Should I contribute to traditional or Roth 401(k)? If your employer offers both: traditional lowers your taxes now; Roth means tax-free money in retirement. Younger workers in lower brackets generally benefit more from Roth. Higher earners currently in peak earning years often benefit more from traditional (pre-tax).