Calculators – free online tools

Calculators: Percentage calculator, Net income estimate, Hourly wage calculator – free in your browser, without sign-up.

Calculate a percentage, a share or a percentage change.

Estimate net income with your own deduction rate. Not a payroll calculation.

Convert monthly pay and weekly hours to an average hourly wage.

Calculate completed years of age and elapsed calendar days.

Calculate BMI and estimated energy needs for adults.

Check IBAN length and MOD-97 checksum. Does not verify an account.

Convert length, weight, temperature and data sizes.

Calculate calendar days between two dates without daylight-saving errors.

Find remaining or elapsed calendar days for a date.

How it works

Each tool explains supported inputs, output and limitations on its own page.

These tools do not send your inputs to a server. Your web host processes technical connection data when you visit the site.