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% Percentage Calculator

All percentage calculations in one place — find X% of Y, percentage change, reverse %, tip with bill split, and discount savings. Instant results, no signup.

Find X% of Y

What is 20% of 500?
What is % of ?
Result
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What Percent is X of Y?

15 is what percent of 75?
is what % of ?
Result
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Percentage Change

What is the % increase from 80 to 100?
From to
Result
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Reverse Percentage

If 120 is 150% of a number, what is that number?
is % of what number?
Result
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Tip Calculator

Split the bill and calculate tip per person
Bill amount:
Tip %:
Split between people
Per Person
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Discount Calculator

How much do you save and pay after a discount?
Original price:
Discount: %
You Pay
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Formula

Percentage Formulas

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Find X% of Y

Formula: Result = (X / 100) × Y
Example: 20% of 500 = (20/100) × 500 = 100
Used for: discounts, tips, tax calculations, scoring.

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Percentage Change

Formula: Change% = ((New − Old) / |Old|) × 100
Positive = increase, Negative = decrease
Used for: price changes, growth rates, performance metrics.

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Reverse Percentage

Formula: Original = Value / (Percentage / 100)
Example: if 120 is 150% of X → X = 120/1.5 = 80
Used for: finding original price before discount or markup.

FAQ

Frequently Asked Questions

Common questions about Percentage calculations

How do I calculate a percentage discount?
Use the "X% of Y" mode. Enter the discount percentage and the original price. For example: 25% of 2,000 = 500 discount. The final price = 2,000 − 500 = 1,500. Alternatively, multiply the original price by (1 − discount/100): 2,000 × 0.75 = 1,500. Or use the Discount tab above for a dedicated view showing exactly how much you save and pay.
What is the difference between percentage increase and percentage points?
If interest rates go from 5% to 7%, that's a 2 percentage point increase, but a 40% increase. "Percentage points" are absolute differences between two percentages. "Percent increase/decrease" is relative to the starting value. This distinction is important in finance and statistics.
How do I find the original price before tax or VAT?
Use the Reverse % mode. If a price including 18% VAT/GST is 1,180, the original is 1,180 ÷ 1.18 = 1,000. Formula: Original = tax-inclusive price ÷ (1 + tax rate). This works for any tax rate — just substitute the applicable percentage.
How do I calculate a score percentage?
Use the "What % is X of Y" mode. Enter your score as X and the total possible as Y. Example: scored 450 out of 600 → (450 / 600) × 100 = 75%. Works for any scoring system — tests, quizzes, or assessments.

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