Calculators
Percentage, tip, unit conversion, and GPA — every calculator in one place, free and account-free.
Percentage Calculator
What is X% of Y, X is what percent of Y, and percentage change (increase or decrease) — with the formulas shown.
Tip Calculator
Work out the tip at any percentage and split the bill evenly between any number of people.
Unit Converter
Convert length, weight, temperature, volume and more — with a dedicated page for each category.
GPA Calculator
Calculate your grade point average from courses, grades and credits — with weighted-average support.
Frequently asked questions
Are the calculators free?
Yes. Every calculator — percentage, tip, unit converter, and GPA — is completely free and works without an account.
How is percentage change calculated?
Percentage change is (new value − old value) ÷ old value × 100. The percentage calculator shows the result and the formula for each of its three modes.
Can the tip calculator split the bill?
Yes. Enter the amount, the tip percentage, and the number of people — the tool shows the tip, the total, and how much each person owes.
Which units are supported?
The converter covers length, weight/mass, temperature, volume, and more categories, each with its own page and set of units.
Is my data stored?
Calculations run in your browser. We do not send or store anything you type in.