Percentage Calculator

Solve percentage increase, decrease & more — pick a mode and get the answer instantly.

X (the percentage)

Y (the value)

How to use

Choose one of the three modes: "X% of Y", "X is what % of Y", or "percentage change from X to Y".
Type your two numbers — the answer updates live as you type.
Read the formula shown under the answer to see how it was computed.

Privacy note: everything runs in your browser — your numbers never leave your device.