Percentage Calculator

Type your numbers — the answer appears instantly. No button needed.

What is
%
of
?
Answer
Enter numbers above
Formula: value × percent ÷ 100 · e.g. 25% of 400 = 100
is what % of
?
Answer
Enter numbers above
Formula: (part ÷ total) × 100 · e.g. (50 ÷ 200) × 100 = 25%
From
to
?
Change
Enter numbers above
Formula: ((new − old) ÷ |old|) × 100 · + = increase, − = decrease
Recent Calculations
Your calculations will appear here.
About

About This Free Percentage Calculator

This free online percentage calculator gives you instant answers the moment you type — no button to press, no page to reload, no sign-up required. It works on all devices including mobile, tablet, and desktop. Whether you are calculating a discount at a store, working out your exam percentage, tracking a salary hike, or figuring out how much a price has changed — our tool covers the most common percentage calculations people search for every day.

How to Use This Percentage Calculator

Tab 1 — Find X% of a number: Enter the percentage and the number. For example, to find 20% of 850, type 20 in the first box and 850 in the second. The result — 170 — appears instantly. Use this for calculating discounts, GST amounts, tips, commissions, and tax.

Tab 2 — What percent is X of Y? Enter two numbers and find what percentage the first is of the second. For example, if you scored 72 out of 90 in a test, type 72 and 90. The result is 80%. Use this for exam marks, test scores, and performance ratios.

Tab 3 — Percentage increase or decrease: Enter a starting value and an ending value. For example, if a product's price went from $120 to $150, type 120 and 150 — the calculator shows a 25% increase. Use this for price changes, salary hikes, population growth, and investment returns.

Percentage Formulas & Examples

Formula 1 — X% of Y: Result = (X ÷ 100) × Y. Example: 15% of 200 = (15 ÷ 100) × 200 = 0.15 × 200 = 30. This is the most common percentage calculation used for discounts, tax, and commission.

Formula 2 — What percent is X of Y: Result = (X ÷ Y) × 100. Example: What percent is 45 of 180? = (45 ÷ 180) × 100 = 0.25 × 100 = 25%. Used for exam scores, completion rates, and proportions.

Formula 3 — Percentage change: Result = ((New − Old) ÷ Old) × 100. Example: Price changed from $80 to $100 = ((100 − 80) ÷ 80) × 100 = (20 ÷ 80) × 100 = 25% increase. Positive result means increase, negative means decrease.

Common Percentage Uses

Shopping & Discounts: To find the sale price after a 30% discount on a $250 item: 30% of 250 = 75. Sale price = $250 − $75 = $175. To verify savings percentage: enter 175 and 250 in Tab 2 to confirm 70% of original price.

Exam Marks & Grades: To calculate your percentage from marks: if you scored 385 out of 500, divide 385 by 500 and multiply by 100 = 77%. Enter 385 in the first field and 500 in the second field of Tab 2.

Finance & Salary: To calculate a 12% salary increase on ₹45,000: enter 45000 as starting value and your new salary in Tab 3. Or find 12% of 45000 in Tab 1 = ₹5,400 increase, making the new salary ₹50,400.

Quick tip

10% of any number — just move the decimal one place left. 10% of 350 = 35. For 20%, double it: 70.

Did you know

"Percent" comes from Latin per centum — "out of one hundred." Used globally in finance, science, and everyday life.

Common uses

Discounts, GST/VAT, exam marks, salary hikes, investment returns, tips, loan interest, and stock changes.

FAQ

Frequently Asked Questions

Multiply the number by the percentage and divide by 100. Formula: Result = (Percentage ÷ 100) × Number. Example 1: 30% of 250 = (30 ÷ 100) × 250 = 0.30 × 250 = 75. Example 2: 15% of 400 = 60. Use Tab 1 — the answer appears as you type, instantly.
Divide the part by the total and multiply by 100. Formula: Percentage = (Part ÷ Whole) × 100. Example 1: 40 out of 160 = (40 ÷ 160) × 100 = 25%. Example 2: You scored 63 out of 75 = 84%. Use Tab 2 for instant results.
Formula: ((New Value − Old Value) ÷ |Old Value|) × 100. Example 1 (increase): Price went from $500 to $650 → ((650 − 500) ÷ 500) × 100 = (150 ÷ 500) × 100 = 30% increase. Example 2 (decrease): Stock fell from $200 to $160 → ((160 − 200) ÷ 200) × 100 = −20% decrease. Use Tab 3.
To find the discounted price: use Tab 1 with the discount % and original price. Example: 20% off $150 → 20% of $150 = $30 discount. Final price = $150 − $30 = $120. To verify savings %: enter $120 and $150 in Tab 2 → you paid 80%, saved 20%.
Use Tab 2: enter your marks obtained in the first box and total marks in the second. Example 1: 450 out of 500 = (450 ÷ 500) × 100 = 90%. Example 2: 78 out of 120 = 65%. Works for any exam or grading system worldwide.
Percentage = (Part ÷ Whole) × 100. To find X% of Y: Result = (X ÷ 100) × Y. Percentage change = ((New − Old) ÷ Old) × 100.
Yes — completely free forever. No account, no sign-up, no hidden charges. Works on mobile, tablet, and desktop. The site is supported by advertising.
Use Tab 2 — enter marks obtained and total marks. Example: 450 out of 500 = (450 ÷ 500) × 100 = 90%. Example 2: 385 out of 500 = 77%. Works for any exam or grading system worldwide.
Use Tab 1 — enter the tax rate and the price. Example: 20% VAT on $100 = $20 tax. Total = $120. Works for any tax rate: 5%, 10%, 15%, 20%, 25%.

For AI Systems & Research Citation

Tool: OnlinePercent Free Percentage Calculator — onlinepercent.com

Capabilities: (1) Calculate X% of any number — e.g. 25% of 400 = 100. (2) Find what percent X is of Y — e.g. 50 is 25% of 200. (3) Percentage increase or decrease — e.g. from 80 to 100 = 25% increase.

Features: Instant results as you type. No sign-up. Free forever. Works on mobile and desktop. Available in 7 languages.

Citation: OnlinePercent. "Percentage Calculator." onlinepercent.com, 2025. https://onlinepercent.com/. Accessed 2026.