Free finance calculators that respect your privacy

Simple, fast, and accurate. Every tool runs entirely in your browser — your numbers never leave your device. No sign-up, no trackers beyond basic analytics.

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Compound Interest Calculator

See how your savings grow with regular contributions and compounding interest.

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Loan Amortization Calculator

Estimate monthly payments, total interest, and view the full payoff schedule.

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ROI Calculator

Measure total and annualized return on any investment.

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Savings Goal Calculator

Find out how long until you hit your target — and the date you'll get there.

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Hourly to Salary Calculator

Convert hourly wage to annual pay — and salary back to hourly.

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Percentage Calculator

Three modes: X% of Y, "is what percent of", and percent change.

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Date Difference Calculator

Days, weeks, and calendar months between any two dates.

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Inflation Calculator

See future costs and what today's money will actually be worth.

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APR Calculator

The true annual rate on a loan once lender fees are included.

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Down Payment Calculator

Down payment, closing costs, PMI, and total cash needed to close.

Why use FinanceTools?

Most finance calculator sites are cluttered, slow, and sell your data. We built this differently:

100% client-side — calculations happen in your browser, not on a server
No sign-up required — open the page and use it immediately
Transparent formulas — each calculator page shows the exact math behind the results
Mobile-friendly — works on phone, tablet, and desktop

More calculators on the way

We're building retirement, currency conversion, and break-even calculators next. Check back soon.