Finance calculators

Mortgage, loan, interest, and investment calculators — everything runs locally in your browser.

Mortgage Calculator — Monthly Payment & Amortization

Calculate monthly mortgage payments, total interest, and full amortization schedule. Enter loan amount, rate, and term.

Loan Calculator — Monthly Payment & Interest

Calculate monthly loan payments and total interest for personal, auto, or business loans. See full amortization schedule.

Compound Interest Calculator

Calculate compound interest with monthly contributions. See balance growth over time with a year-by-year breakdown.

CAGR Calculator — Compound Annual Growth Rate

Calculate compound annual growth rate between two values over any time period. Instant CAGR percentage.

FIRE Calculator — Financial Independence Retire Early

Calculate years to financial independence using the 4% rule. Enter savings, expenses, income, and savings rate.

Inflation Calculator — Purchasing Power Over Time

See how inflation erodes purchasing power. Enter an amount and year range using historical US CPI data.

Stock Average Price Calculator — Cost Basis

Calculate weighted average share price across multiple purchases. Enter shares and price per lot.

Dollar Cost Averaging Calculator

Model dollar-cost averaging with recurring investments. See average cost per share and total invested.

DCF Calculator — Discounted Cash Flow NPV

DCF Calculator — Discounted Cash Flow NPV. Free, instant, runs in your browser.

Position Size Calculator — Risk per Trade

Position Size Calculator — Risk per Trade. Free, instant, runs in your browser.

Crypto Profit Calculator

Crypto Profit Calculator. Free, instant, runs in your browser.

Simple Interest Calculator

Calculate simple interest with I = P·r·t. Enter principal, rate, and time in years, months, or days — compare against annual compounding.

Credit Card Interest Calculator

See how long paying off a credit card takes and what it costs. Compare your monthly payment against minimum payments at your APR.

Loan Payoff Calculator

Find your loan payoff date and what extra monthly payments save — months cut and interest saved, side by side with your current plan.

Mortgage Refinance Calculator

Should you refinance? Compare current vs new rate and term: monthly savings, break-even point on closing costs, and lifetime savings.

Debt Payoff Calculator

Plan your debt-free date. List balances, APRs, and minimums, add an extra budget, and compare snowball vs avalanche strategies.

Rent vs Buy Calculator

Compare renting vs buying a home over your time horizon — mortgage, taxes, maintenance, and appreciation against rent growth and investing.

About these finance calculators

Personal and business finance decisions often come down to a few numbers — monthly payment, total interest, growth rate, or annual return. These calculators handle the math instantly so you can compare options without opening a spreadsheet.

What you can calculate

Use the mortgage calculator for home loans with full amortization schedules. The loan calculator works for any fixed-rate installment loan in months. The compound interest calculator projects savings growth with optional monthly contributions. The CAGR calculator smooths investment returns to an annual rate.

Privacy

All calculations run in your browser. Loan amounts, rates, and balances never leave your device.