Percentage Calculator — Free Online Calculator for X% of Y,

Calculate what X% of Y is, X is what % of Y, percentage increase/decrease, and add/remove a percentage. Handles decimals and large numbers — all in your browser. This free online percentage calculator runs entirely in your browser — no data is ever uploaded to a server.

How to Use

1. Enter your input — type or paste your two numbers and pick a mode (what X% of Y, X is what % of Y, increase/decrease, or add/remove).

2. See live results — the tool updates instantly as you type.

3. Copy or download — copy the output to clipboard or download it.

4. History — your recent inputs are saved locally and can be pinned for quick access.

Example

Choose "What is X% of Y?", enter 15 and 200, and hit Calculate — it returns 30 with the full formula 15% of 200 = 0.15 × 200.

Also check out the live tool at freeq.one/tools/percent — part of the FreeQ.One suite of free online tools.