Percentage Calculator

Free online percentage calculator. Calculate % of a number, % change, % increase/decrease. Instant results.

Percent

Of total

How to Use

Choose a calculation mode: % of, is what %, % change, or +/− %
Enter your numbers
See the result instantly

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Frequently Asked Questions

What is the formula for percentage?

Percentage = (Part / Whole) × 100. For example, 30 is 20% of 150 because (30/150) × 100 = 20.

How do I calculate percentage increase?

Use the % Change tab. Formula: ((New − Old) / Old) × 100. Enter the old and new values to see the change.

How do I calculate a discount percentage?

To calculate a discount: multiply the original price by the discount percentage (e.g., 30% off $50 = $50 × 0.30 = $15 off, so you pay $35). Use our Discount Calculator for a dedicated tool with automatic calculation.

What's the difference between percentage points and percent?

A percentage point is the absolute difference between two percentages. For example, if interest rates rise from 4% to 5%, that's a 1 percentage point increase, but a 25% relative increase (since 1/4 = 0.25). This distinction is crucial in finance, statistics, and data reporting.

Can I calculate reverse percentages?

Yes! If you know the final price after a 20% discount was $80, you can find the original: $80 ÷ (1 − 0.20) = $100. Use the '% of' mode and work backwards, or use our percentage increase/decrease mode to find the original value.