About CalcPerch

CalcPerch is a small, independent collection of free online calculators — a perch where you can land, get your answer, and fly off.

Our mission

Most calculator sites bury a tiny input box under walls of clutter. We build the opposite: every CalcPerch tool loads instantly, works on any phone or laptop, and gives you the answer plus a short, plain-English explanation of the math behind it — so you don't just get a number, you understand it.

How our calculators work

All CalcPerch tools run entirely in your browser using JavaScript. Nothing you type — not your birth date, your weight, or your loan amount — is ever sent to our servers or stored anywhere. Close the tab and it's gone.

Accuracy

Each calculator is built from standard, published formulas (which we show on every tool page) and is tested against known reference values before release. That said, our tools are for general information: for medical, legal, or financial decisions, please consult a qualified professional.

How the site is funded

CalcPerch is free to use and supported by advertising. Ads never affect the results our calculators produce.

Get in touch

Found a bug, want a calculator we don't have yet, or spotted something unclear? We'd genuinely like to hear it — see the contact page.