Percentage Calculator
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What is a Percentage Calculator?
A Percentage Calculator is a quick online tool that handles the three most common percentage problems in seconds. Whether you need to find a percentage of a value, determine what percentage one number is of another, or compute percentage change between two figures, this tool covers it all — no manual math required.
Percentages appear everywhere in daily life: discounts, tax rates, exam scores, interest rates, growth metrics, and more. Having a fast and reliable calculator saves both time and mental effort.
Three Calculation Modes
- What is X% of Y? — Use this to find a portion of a value. For example, "What is 20% of 500?" → 100. Formula:
(X / 100) × Y - X is what % of Y? — Use this to express a part as a percentage of a whole. For example, "100 is what % of 500?" → 20%. Formula:
(X / Y) × 100 - % change from X to Y? — Use this to measure growth or decline. For example, "% change from 400 to 500?" → +25%. Formula:
((Y − X) / X) × 100
Example Calculations
Mode 1 — What is 15% of 2,000?
(15 / 100) × 2,000 = 300
Mode 2 — 75 is what % of 300?
(75 / 300) × 100 = 25%
Mode 3 — % change from 800 to 1,000?
((1,000 − 800) / 800) × 100 = +25%
(15 / 100) × 2,000 = 300
Mode 2 — 75 is what % of 300?
(75 / 300) × 100 = 25%
Mode 3 — % change from 800 to 1,000?
((1,000 − 800) / 800) × 100 = +25%
Common Use Cases
- Shopping discounts — Instantly know how much you save on a sale price.
- Tax calculations — Find the tax amount on any invoice or purchase.
- Exam scores — Convert raw marks into a percentage.
- Business metrics — Track revenue growth or decline accurately.
- Tipping — Calculate the right tip amount at a restaurant.
Have questions about this tool?
Visit our FAQ page