Fast, free calculators for everyday questions

Every tool on CalcPerch runs instantly in your browser — no sign-up, no downloads, and your numbers never leave your device.

Everyday Math

Find X% of a number, what percent X is of Y, and percentage increase or decrease.

Tip amount, total bill, and per-person share when splitting with friends.

Sale price and savings — including stacked "extra % off" deals.

Monthly payment and total interest for any personal, auto, or home loan.

How savings grow with monthly contributions and compounding returns.

Convert annual salary to your true hourly rate — with real hours and vacation.

What every salary from $25k to $300k is per hour, week, and month.

Length, weight, temperature, volume, area, and speed — metric ↔ US.

50+ dedicated pages: cm to inches, kg to lbs, °C to °F, and more.

Compare GPT, Claude & Gemini API pricing and estimate your monthly bill.

Live word, character, sentence counts and reading time.

Strong random passwords, generated locally in your browser.

Your exact age in years, months, and days — plus days lived and next-birthday countdown.

Body mass index in metric or US units, with your healthy weight range.

Mortgage calculator, date duration calculator, QR code generator, and more. New tools are added every week.