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Percentage Calculator – All-in-One Free Online

Calculate percentages instantly with 8 different calculation modes. Find percent of a number, percentage increase/decrease, percentage difference, discount price, tip, markup, reverse percentage and fraction conversions — all in one place.

🆓 Free ⚡ Instant 8️⃣ Modes 📋 History ✅ No Sign-up

🧮 Select Calculation Mode

8 modes available
Formula: Result = (Percentage ÷ 100) × Number  |  Example: 25% of 200 = 50
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Formula: % = (X ÷ Y) × 100  |  Example: What % is 30 of 120? = 25%
of
Formula: New Value = Original × (1 + %/100)  |  Example: 200 + 15% = 230
%
Formula: New Value = Original × (1 − %/100)  |  Example: 200 − 20% = 160
%
Formula: % Change = ((New − Old) ÷ Old) × 100  |  Positive = increase, Negative = decrease
→
Formula: Sale Price = Original × (1 − Discount%/100)  |  Savings = Original − Sale Price
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Formula: Sell Price = Cost × (1 + Markup%/100)  |  Profit % = (Profit ÷ Cost) × 100
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Formula: Original = Value ÷ (Percentage ÷ 100)  |  Example: 60 is 75% of what? = 80
is
%

📊 Percentage Quick Reference

FractionDecimalPercentage
1/20.550%
1/40.2525%
3/40.7575%
1/30.333…33.33%
2/30.666…66.67%
1/50.220%
1/80.12512.5%
1/100.110%
1/200.055%
1/1000.011%
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💡 How to Use

1️⃣Choose one of the 8 calculation modes at the top.
2️⃣Enter the required numbers in the input fields shown.
3️⃣Click the Calculate button for instant results.
4️⃣Your calculations are saved in History for quick reference.

📌 Common Percentages

💡10% of any number → divide by 10
💡25% of any number → divide by 4
💡50% of any number → divide by 2
💡1% of any number → divide by 100
💡5% = half of 10%

❓ Frequently Asked Questions – Percentage Calculator

How do I calculate a percentage of a number?
To find a percentage of a number, multiply the number by the percentage and divide by 100. For example, 25% of 200 = (25 × 200) ÷ 100 = 50. Use the "% of a Number" mode above to calculate this instantly.
How do I calculate percentage increase?
Percentage increase formula: New Value = Original × (1 + Percentage/100). For example, increasing 200 by 15% gives 200 × 1.15 = 230. You can also find the increase amount (Increase = Original × Percentage ÷ 100) and add it to the original.
How do I calculate percentage change between two numbers?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase, negative means a decrease. For example, from 150 to 180: ((180 − 150) ÷ 150) × 100 = 20% increase. Use the "% Change" mode above.
What is reverse percentage calculation?
Reverse percentage helps you find the original value when you know the result and the percentage. Formula: Original = Known Value ÷ (Percentage ÷ 100). For example, if 60 is 75% of a number: 60 ÷ 0.75 = 80. Useful when a price after discount is known and you need the original price.
How is markup different from discount?
Markup is adding a percentage to a cost price to get the selling price (used by sellers to make profit). Discount is subtracting a percentage from the original price (used to reduce price for buyers). Markup increases the value; discount decreases it. Both are calculated using similar percentage formulas but in opposite directions.
How do I convert a fraction to a percentage?
To convert a fraction to a percentage, divide the numerator by the denominator and multiply by 100. For example, 3/4 = 0.75 × 100 = 75%. Refer to the Quick Reference table on this page for common fraction-to-percentage conversions.