Every percent question, answered live — X% of Y, what percent one number is of another, percent change, and adding or subtracting a percentage.
🧮 All four answer as you type. Need tips, discounts or loans? Try the all-in-one calculator.
"200 minus 20%" answers a sale price instantly; "plus" adds VAT or sales tax — no mental gymnastics needed.
Percent change between two figures — revenue, weight, followers — with the formula shown so you can cite it.
"42 is what percent of 60" turns marks into percentages in a keystroke — handy for grading and study goals.
Percent change divides by the starting value — going from 1 to 10 is a 900% increase, and from 0 to anything is undefined. For tiny baselines, absolute numbers are more meaningful.
If 80 is the price after a 20% discount, the original is 80 ÷ (1 − 0.20) = 100 — not 80 + 20%. Reversing means dividing, not adding back.
Yes — all fields accept decimals and negative numbers, and the working line always shows what was computed.