Free Percentage Calculator — Three Modes, Instant Results

Percentage maths comes up constantly — discounts, test scores, salary hikes, GST, tip amounts. But the formula changes depending on what you’re solving for, and it’s easy to mix them up.

The Tools.Town Percentage Calculator handles all three cases from a single page:

Mode 1 — What is X% of Y? Type in a number and a percentage and you get the result instantly. Useful for calculating discounts, tips, and tax amounts.

Mode 2 — X is what percent of Y? Given two numbers, find out what fraction one is of the other, expressed as a percentage. Useful for scores, ratios, and proportions.

Mode 3 — Percentage change from X to Y Enter an old value and a new value and get the exact percentage increase or decrease. Useful for price changes, growth metrics, and year-on-year comparisons.

All three modes update live as you type — no submit button, no page reload.

Frequently Asked Questions

What is X% of Y? Multiply Y by X and divide by 100. Our calculator does this instantly.

How do I find the percentage change? Subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase; negative is a decrease.

Is the calculator free? Yes — 100% free with no signup required.

Try it now — Open Percentage Calculator — no signup required.