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Percentage Calculator: Work Out Percentages Instantly

Tooly · 2026-08-02 · 5 min read

Percentages are everywhere: sales, tips, grades, tax, interest, growth — and the mental math gets messy fast. A percentage calculator settles it in a keystroke: percent of a number, percentage change, increase or decrease. No signup, no app, nothing uploaded.

What a percentage calculator does

• Percent of a number — what is 25% of 200? → 50
• Percentage change — what % did 80 → 100 increase? → 25%
• Increase/decrease — add or subtract a percentage from a value
• Reverse — what percent is X of Y?

Calculate percentages free with Tooly

The Tooly Percentage Calculator covers it all:

• Enter any two numbers → the percentage answer instantly
• Handles percent-of, change, increase, and decrease modes
• Runs in your browser — nothing is uploaded
• Free, no signup, no limits

Everyday uses

Scenario	Example
Shopping discount	25% off $80 → save $20 (see the Discount Calculator)
Test grade	45 out of 60 → 75%
Salary raise	+10% on $50,000 → $55,000 (see the Salary Calculator)
Business margin	Cost $40, price $50 → 20% markup
Tax	8% on $100 → $8 (see the Sales Tax Calculator)

Frequently Asked Questions

Is this percentage calculator really free? Yes — unlimited use, no account, no watermark.

Is my data private? Everything runs in your browser — your numbers never leave your device.

Can it calculate percentage change? Yes — enter the old and new values to get the exact change percentage.

What else should I check? The Percentage Calculator pairs with the Discount, Tip, and Sales Tax calculators for all money math.

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