About
CalcPros is a free collection of investment and financial calculators. The goal is simple: give you a clear number, quickly, without sign-ups, pop-ups or jargon.
What makes this different
- Everything runs in your browser. Your amounts, salary figures and goals are never uploaded anywhere. There is no account and no tracking of what you calculate.
- Formulas are shown, not hidden. Each calculator page displays the exact formula used and a worked example, so you can verify the result by hand.
- Built for phones first. Most people check these numbers on a phone, so the layout, buttons and charts are designed for a small screen and then scaled up.
- Honest about limits. Where a result depends on an assumption — an expected return, an inflation rate, a tax rate — we say so and let you change it.
What we do not do
- We do not give personalised financial advice.
- We do not show live market, gold or crypto prices. Every price used is one you type in.
- We do not promise returns. Market-linked projections are illustrations, not forecasts.
How the calculators are built
Wherever a standard time-value-of-money formula applies — future value, annuity and annuity-due, amortisation, present value — it comes from one shared, tested library, so the same formula cannot drift between two pages. Calculators that model something the standard formulas do not cover, such as brokerage charge stacks, tax treatment, step-up contribution schedules or trading fees, carry that specific logic themselves.
Nothing is invented: each page shows the formula it uses and a worked example you can follow by hand. The shared library and the calculator-specific logic are both covered by an automated test suite that runs on every change, and the worked examples are checked against the calculators themselves so the two cannot fall out of step.
Those formulas are covered by an automated test suite that runs before every release. The expected values in it were worked out independently rather than copied from the code, so if a formula is ever changed by mistake the tests disagree instead of silently publishing a wrong number. Each calculator page also shows the formula it used and a worked example, so you can check the arithmetic by hand.
Where results are estimates
Anything involving a future return, an inflation rate or a tax rate is an estimate built on an assumption you supply. A SIP projection at 12% is not a forecast; it answers the question "what if returns averaged 12%?" Deposit and loan calculations are far more predictable, because the rate is contractual — though banks may round differently or add fees this site cannot know about.
Accuracy and corrections
If you believe a calculation is wrong, please tell us. Include the calculator name, every value you entered, the result you saw and the result you expected — that is usually enough to reproduce and fix an issue quickly. Corrections are welcome and taken seriously; a calculator that is quietly wrong is worse than no calculator.
Please verify anything important
These tools are a starting point for thinking, not a substitute for advice. For decisions that matter — a home loan, a retirement plan, a large investment, anything with tax consequences — check the numbers against your bank, fund house or a qualified professional registered to advise in your country before acting on them.