Finance Calculators
Ninety-plus finance calculators — mortgage, retirement, loan, tax, investment — that run entirely in your browser. Every formula is cited to a primary source (IRS, CFPB, Federal Reserve); the limitations of each model are spelled out on the page itself.
These are engineering tools, not financial advice. Take the numbers to a certified financial planner, CPA, or your bank before making a decision that materially affects your money. See the editorial policy for how these calculators are written and reviewed.
How to Choose the Right Financial Calculator
With over 70 calculators available, the best way to find what you need is to start with your situation, not a specific tool. Here are the most common financial scenarios and which calculators will help you the most.
Buying a Home
Purchasing a home is the largest financial decision most people make. Start with the house affordability calculator to understand your price range based on income and debts. Then use the mortgage calculator to estimate monthly payments, and the down payment calculator to plan your savings timeline. Not sure if buying makes sense? The rent vs. buy calculator compares the true long-term costs of each option.
Getting Out of Debt
If you are carrying balances across multiple accounts, the first step is knowing where you stand. The debt ratio calculator shows your debt-to-income ratio, a key number lenders use and you should track. From there, the debt payoff calculator lets you compare snowball vs. avalanche strategies to find your fastest path out. For credit card debt specifically, try the credit card payoff calculator. Considering combining debts? The debt consolidation calculator shows whether consolidating actually saves you money.
Planning for Retirement
Retirement planning depends heavily on your age and how much you have saved so far. The retirement calculator gives you a big-picture view of whether you are on track. If you have an employer plan, the 401k calculator shows how matching and contributions compound over decades. Compare tax strategies with the Roth IRA calculator. Already have a pension? The pension calculator and annuity calculator help you model guaranteed income. For the FIRE-minded, the Coast FIRE calculator shows when your existing savings can grow on their own.
Starting a Business
Before launching, you need to understand your numbers. Use the margin calculator to set pricing that covers costs and delivers profit. The ROI calculator helps evaluate whether an investment of time or money is worth it. For larger projects, the NPV calculator accounts for the time value of money across multiple years of cash flows. These tools help you move from gut feelings to data-driven decisions.
Managing Your Money Day-to-Day
Everyday financial literacy starts with knowing what you earn and where it goes. The salary calculator converts between hourly, weekly, and annual pay so you can compare job offers accurately. The take-home pay calculator shows your actual paycheck after taxes and deductions, which is the number your budget should be built around. Use the budget calculator to allocate your income across needs, wants, and savings.
Understanding Loans
Whether it is a car, a degree, or a home, most major purchases involve borrowing. The loan calculator handles the basics for any loan type. For vehicle financing, the auto loan calculator factors in trade-ins and down payments. The student loan calculator covers income-driven repayment plans. Once you have a loan, the amortization calculator shows exactly how each payment splits between principal and interest. The refinance calculator tells you if switching to a lower rate is worth the closing costs.
Financial Calculators FAQ
How accurate are online financial calculators?
Online calculators are accurate for the math they perform, but they are only as good as the assumptions you provide. A mortgage calculator will correctly compute your monthly payment given a rate and term, but it cannot predict future interest rate changes, property tax reassessments, or insurance cost increases. Use calculators to build a realistic range of scenarios rather than relying on a single number. Run optimistic, realistic, and pessimistic cases to understand your true exposure.
Should I trust a calculator for major financial decisions?
Calculators are excellent for building intuition and narrowing your options, but they should be one input among several for big decisions. A retirement calculator can tell you whether your savings rate is roughly on track, but it cannot account for your specific tax situation, health considerations, or family obligations. For decisions involving six figures or more, such as buying a home, choosing between pension options, or planning an estate, pair your calculator results with advice from a qualified financial professional.
What is the difference between APR and interest rate?
The interest rate is the cost of borrowing the principal amount. The APR (annual percentage rate) includes the interest rate plus additional costs like origination fees, closing costs, and mortgage insurance, expressed as a yearly rate. The APR is always equal to or higher than the interest rate. When comparing loan offers, APR gives you a more complete picture of the total cost. For example, a loan at 6.5% interest with high fees might have a 6.9% APR, making it more expensive than a 6.7% loan with lower fees and a 6.8% APR. Our APR calculator helps you compare these numbers side by side.
How does compound interest actually work?
Compound interest means you earn interest on your interest, not just on your original deposit. If you invest $1,000 at 7% annually, you earn $70 in year one. In year two, you earn 7% on $1,070, giving you $74.90 instead of another flat $70. This difference seems small early on, but it accelerates dramatically over time. After 30 years, that $1,000 grows to about $7,612 with compounding, versus just $3,100 with simple interest. This is why starting to invest early matters so much. Even small amounts benefit enormously from decades of compounding. Try our compound interest calculator to see the effect with your own numbers.
What financial calculations should everyone know?
Five calculations form the foundation of personal finance literacy. First, your debt-to-income ratio: divide your total monthly debt payments by your gross monthly income. Lenders want this below 36%, and below 28% for housing alone. Second, your savings rate: the percentage of take-home pay you save each month. Financial planners typically recommend 20% or more. Third, your emergency fund target: three to six months of essential expenses. Fourth, your net worth: total assets minus total liabilities. Track this quarterly to see your real financial progress. Fifth, the Rule of 72: divide 72 by your annual return rate to estimate how many years it takes to double your money. At 8% returns, your money doubles roughly every 9 years.
When should I use multiple calculators together?
Financial decisions rarely exist in isolation, so combining calculators gives you a more complete picture. For example, when buying a home, start with the house affordability calculator, then run the mortgage calculator for payment estimates, and finally check the amortization schedule to understand how equity builds over time. When planning for retirement, combine the 401k calculator with the Roth IRA calculator to optimize your tax strategy across accounts. For debt payoff, run the debt ratio calculator first to understand your overall position, then use the debt payoff calculator to build a specific elimination plan. The goal is to connect the dots between related decisions rather than optimizing each one in isolation.
Loans & Mortgage
Calculate payments, amortization, and payoff schedules for all types of loans
Loan Calculator
Calculate monthly loan payments and total interest for any type of loan.
Auto Loan Calculator
Calculate car loan payments with trade-in value and down payment options.
Personal Loan Calculator
Calculate unsecured personal loan payments and total cost.
Student Loan Calculator
Calculate student loan repayment options and income-driven plans.
Business Loan Calculator
Calculate business loan payments and ROI for commercial financing.
Boat Loan Calculator
Calculate marine financing payments and total loan cost.
Mortgage Calculator
Calculate monthly mortgage payments including taxes and insurance.
Amortization Calculator
View detailed payment schedule with principal and interest breakdown.
FHA Loan Calculator
Calculate FHA mortgage payments with required insurance premiums.
VA Mortgage Calculator
Calculate VA loan benefits and payments for veterans.
Refinance Calculator
Compare refinancing options and calculate break-even point.
Mortgage Payoff Calculator
Calculate how extra payments accelerate mortgage payoff.
Auto Lease Calculator
Calculate monthly car lease payments and total lease cost.
Lease Calculator
Calculate general lease payments for equipment or property.
Payment Calculator
Calculate monthly payments for any type of loan or financing.
Repayment Calculator
Plan and optimize your loan repayment strategy.
Interest & Savings
Calculate interest growth, savings goals, and investment returns
Compound Interest Calculator
Calculate compound growth with regular contributions over time.
Simple Interest Calculator
Calculate simple interest for loans or investments.
Rule of 72 Calculator
Estimate time to double or required rate using the Rule of 72.
Interest Calculator
Calculate interest amounts for various financial scenarios.
APR Calculator
Calculate and compare annual percentage rates.
Interest Rate Calculator
Find the interest rate needed to reach your financial goals.
CD Calculator
Calculate certificate of deposit returns and maturity value.
Savings Calculator
Plan your savings growth and reach your financial goals.
Investment
Analyze investment returns, valuations, and financial metrics
Investment Calculator
Calculate investment growth with regular contributions and withdrawals.
CAGR Calculator
Compute compound annual growth rate and total return.
NPV Calculator
Calculate net present value and profitability index.
ROI Calculator
Calculate return on investment for any type of investment.
IRR Calculator
Calculate internal rate of return for cash flow analysis.
Bond Calculator
Calculate bond yields, prices, and duration.
Average Return Calculator
Calculate average investment returns over time.
Present Value Calculator
Calculate present value of future cash flows.
Future Value Calculator
Calculate future value of investments and savings.
Payback Period Calculator
Calculate how long it takes to recover an investment.
Retirement
Plan your retirement with 401k, IRA, and pension calculators
Retirement Calculator
Plan your retirement savings and estimate required nest egg.
401k Calculator
Calculate 401k growth with employer matching and contributions.
Roth IRA Calculator
Calculate Roth IRA growth and tax-free retirement income.
IRA Calculator
Calculate traditional IRA growth and tax deductions.
RMD Calculator
Calculate required minimum distributions from retirement accounts.
Pension Calculator
Calculate pension benefits and retirement income.
Annuity Calculator
Calculate annuity payments and retirement income streams.
Social Security Calculator
Estimate your Social Security benefits based on your earnings history and retirement age.
Coast FIRE Calculator
Calculate your Coast FIRE number and see when you can stop saving for retirement while your investments grow to your target.
Debt
Manage and eliminate debt with payoff strategies and calculators
Debt Payoff Calculator
Plan your debt payoff strategy with snowball or avalanche methods and see your debt-free date.
Credit Card Calculator
Calculate credit card payments and interest costs.
Credit Card Payoff Calculator
Plan your credit card debt elimination strategy.
Debt Consolidation Calculator
Compare debt consolidation options and potential savings.
Debt Ratio Calculator
Calculate your debt-to-income ratio for loan qualification.
Emergency Fund Calculator
Calculate how much you need in your emergency fund based on your expenses and risk factors.
Tax
Calculate taxes, deductions, and take-home pay
Tax Calculator
Estimate federal and state income taxes.
Self-Employment Tax Calculator
Calculate your self-employment taxes, quarterly estimates, and see how much to set aside from your 1099 income.
Sales Tax Calculator
Calculate sales tax on purchases.
VAT Calculator
Calculate value-added tax for international transactions.
Estate Tax Calculator
Calculate estate taxes and inheritance tax liability.
Take Home Pay Calculator
Calculate your net pay after taxes and deductions.
Salary Calculator
Convert between hourly, weekly, monthly, and annual salary.
Real Estate
Analyze home affordability, mortgages, and rental properties
House Affordability Calculator
Calculate how much house you can afford based on income and debts.
Down Payment Calculator
Calculate down payment requirements and savings timeline.
Rent vs Buy Calculator
Compare the costs of renting versus buying a home.
Rent Calculator
Calculate rental costs and affordability.
Real Estate Calculator
Analyze real estate investment returns and cash flow.
Rental Property ROI
Analyze rental property investments with cash flow, cap rate, and ROI calculations.
House Hacking Calculator
Analyze the financials of house hacking - living in one unit while renting others to offset your mortgage.
Depreciation Calculator
Calculate asset depreciation for real estate and business assets.
Business
Business finance calculators for margins, budgets, and metrics
Margin Calculator
Calculate profit margins and markup percentages.
Discount Calculator
Calculate discounts, sale prices, and savings.
Commission Calculator
Calculate sales commission and earnings.
Budget Calculator
Plan your monthly budget and track expenses.
SaaS LTV & CAC Calculator
Calculate customer lifetime value, CAC payback, and other key SaaS metrics to optimize your unit economics.
Fee Analyzer
Analyze investment fees and see how they impact your long-term returns.
Currency
Currency conversion, inflation, and rewards calculators
Currency Calculator
Convert between different currencies with live exchange rates.
Inflation Calculator
Calculate inflation impact on purchasing power over time.
Cash Back Calculator
Calculate cash back rewards and credit card benefits.
Impermanent Loss Calculator
Calculate potential impermanent loss when providing liquidity to AMM pools and compare to holding tokens.
Why Use Our Calculators?
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