How do I calculate X percent of Y?

Convert the percentage to a decimal and multiply by the number. For example, 20% of 150 is 0.20 × 150 = 30.

How do I calculate what percent X is of Y?

Divide X by Y, then multiply by 100. For example, 30 is 20% of 150 because 30 ÷ 150 × 100 = 20%.

⚡ Instant percentage calculations

Percentage Calculator for Everyday Math

Quickly calculate percentages, discounts, taxes, profit margins, growth rates, and percentage changes with a clean calculator that updates as you type.

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Percentage Calculator

Select the type of percentage calculation you need. Results update instantly when you change any input.

Percentage

Number

Result

15% of 200 = 30

Tip: Use this mode for discounts, tax, commission, or finding a portion of a total.

Helpful Examples

Use these real-world examples to understand percentages faster and apply them in daily decisions.

Discounts

A jacket costs $80 and has a 25% discount. Calculate 25% of 80 = $20, so the sale price is $60.

Taxes & Fees

If a product is $120 and sales tax is 8%, calculate 8% of 120 = $9.60. Total price is $129.60.

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Profit Growth

If profit increased from $5,000 to $6,250, the percentage increase is 25%.

Common Uses for Percentage Calculations

Percentages are useful for shopping, finance, education, health, business reporting, and performance tracking.

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Shopping Decisions

Compare discounts, calculate final prices, estimate taxes, and check whether a deal is truly worth it.

Business Metrics

Calculate margins, markups, conversion rates, revenue growth, and month-over-month changes.

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School & Reports

Find test scores, grade percentages, survey results, and progress toward goals.

Frequently Asked Questions

Quick answers to common percentage calculation questions.

What is the formula for X% of Y?

The formula is (X ÷ 100) × Y. For example, 15% of 200 is 0.15 × 200 = 30.

How do I calculate X is what percent of Y?

Use (X ÷ Y) × 100. For example, 30 is what percent of 150? 30 ÷ 150 × 100 = 20%.

How do I calculate percentage increase or decrease?

Use ((New value − Original value) ÷ Original value) × 100. A positive result is an increase; a negative result is a decrease.

Can I use this for discounts, taxes, and profit margins?

Yes. The calculator is designed for everyday calculations including discounts, sales tax, tips, profit growth, business metrics, and school scores.