Free online calculators
Fast, free tools with no sign-up, built for everyday calculations.
Featured tools
BMI Calculator
Calculate your body mass index from your weight and height.
Compound interest calculator
Calculate how much your investment will grow with regular contributions and an annual interest rate.
Merge PDF
Combine several PDF files into a single document, in the order you choose.
Convert image
Convert between JPG, PNG and WebP by picking the output format.
Percentage calculator
Find the % of an amount, what % one number is of another, or the percentage change between two values.
Age calculator
Calculate your exact age in years, months and days from your date of birth.
URL QR code
Generate a QR code that opens a web page when scanned.
Unit converter
Convert between units of length, weight, temperature, volume and speed.
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What is WebyTooly
Tools that run in your browser
WebyTooly brings together calculators, converters and utilities for PDFs, images, QR codes and timers. Calculations run in your own browser, you don't need to sign up and there is nothing to install.
Every tool explains its result
Next to each calculator you'll find how it is calculated, the formula, a worked example and answers to the most common questions, so you can check the result instead of just copying it.
Adapted to your language
The site is available in seven languages, with number formats, currency and terminology adapted to each one. Results are indicative and do not replace professional advice.