Free Online Financial Calculators

Compound interest, mortgages, SIP, retirement planning — 10 professional calculators that run entirely in your browser. No sign-up, and no data ever leaves your device.

Compound Interest Calculator

Future value of a lump sum plus monthly contributions, with growth chart and yearly breakdown.

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Loan / Mortgage Calculator

Compare fixed-payment (annuity) and declining-payment schedules with a full amortization table.

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SIP Calculator

Project a monthly investment plan — with an optional annual step-up — into future value.

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Retirement Calculator

Project your nest egg at retirement and a sustainable monthly withdrawal.

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Savings Goal Calculator

How much to save each month to hit a target amount by a deadline.

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CAGR Calculator

Reverse-engineer the true annualized return from start and end values — or project a final value.

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Inflation Calculator

See what today's money will be worth — and what things will cost — after years of inflation.

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Early Payoff Calculator

See how much interest an extra monthly payment saves and how much sooner you're done.

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Currency Converter

Convert between 28 world currencies with daily ECB reference rates.

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Percentage Calculator

Percent of a number, share of a total, rate of change, and percent increase/decrease.

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Why FinFlow?

Frequently asked questions

Is FinFlow free?
Yes — every calculator is free, with no registration and no usage limits. The site is supported by ads.
Is my financial data uploaded?
No. All calculations run as JavaScript inside your browser; nothing you enter is sent to or stored on any server.
Are the results accurate?
The tools use industry-standard formulas (annuity payments, compound interest, etc.) and show the formula plus a full breakdown for verification. Results are for reference — confirm exact terms with your lender or broker.
Disclaimer Results are for reference only and do not constitute financial, tax, or legal advice. Actual rates, returns, and fees depend on the terms of your financial institution.