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Free Percentage Calculator Online

Calculate percentages instantly with 6 different calculation modes. Find percentages, percentage increase and decrease, percentage difference, original values before change, and more. No sign-up needed, results are instant.

📊 Percentage Calculators

🔢

What is X% of Y?

Find a percentage of a number

Result = (X ÷ 100) × Y
% of =
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❓

X is what % of Y?

Find what percent one number is of another

Result = (X ÷ Y) × 100
is what % of
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📈

Percentage Increase

How much did a value increase?

Result = ((New - Old) ÷ Old) × 100
→
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📉

Percentage Decrease

How much did a value decrease?

Result = ((Old - New) ÷ Old) × 100
→
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🔄

Add / Remove a Percentage

Apply a % change to a number

Increase: Y × (1 + X/100)
Decrease: Y × (1 - X/100)
%
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🔍

Find Original Value

Reverse-calculate before a % change

After increase: Y ÷ (1 + X/100)
After decrease: Y ÷ (1 - X/100)
after
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↔️

Percentage Difference

Compare two values as a percentage

Result = |A − B| ÷ ((A + B) ÷ 2) × 100
vs
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🍽️

Tip Calculator

Calculate tip and split the bill

Tip = Bill × (Tip% ÷ 100)
Bill $
Tip % People
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📋 Common Percentage Reference Table

Click any row to load it into Calculator #1 (What is X% of Y?):

Percentage of 100 of 200 of 500 of 1,000 Quick Trick
💡 Mental Math Tip: To find 10% of any number, just move the decimal point one place to the left. For 5%, halve the 10% result. For 20%, double the 10% result.

🌍 Real-World Percentage Examples

Here are common real-world scenarios where percentage calculations are used:

🛍️

Shopping Discount

A $120 jacket is 30% off. What do you pay?

120 × (1 − 0.30) = $84
💰

Salary Raise

Salary goes from $50,000 to $57,500. What % raise?

((57500−50000)÷50000)×100 = 15%
📊

Test Score

You scored 42 out of 50. What is your percentage?

(42 ÷ 50) × 100 = 84%
🏦

VAT / Tax

Price is $200 before 20% VAT. What is the final price?

200 × 1.20 = $240
📉

Stock Drop

Stock fell from $150 to $120. What % drop?

((150−120)÷150)×100 = 20%
🍽️

Restaurant Tip

Bill is $65. You want to leave an 18% tip. How much?

(18 ÷ 100) × 65 = $11.70

📐 All Percentage Formulas

A complete reference for all percentage formulas used in this calculator:

🔢 Percentage of a Number

Result = (Percentage ÷ 100) × Number

Example: 15% of 200 = (15 ÷ 100) × 200 = 30

❓ What Percent Is X of Y?

Percentage = (X ÷ Y) × 100

Example: 30 is what % of 200? = (30 ÷ 200) × 100 = 15%

📈 Percentage Increase

% Increase = ((New − Old) ÷ Old) × 100

Example: 80 → 100 = ((100 − 80) ÷ 80) × 100 = 25% increase

📉 Percentage Decrease

% Decrease = ((Old − New) ÷ Old) × 100

Example: 100 → 75 = ((100 − 75) ÷ 100) × 100 = 25% decrease

🔍 Find Original Value

After increase: Original = Final ÷ (1 + %/100)
After decrease: Original = Final ÷ (1 − %/100)

Example: $120 after 20% increase → Original = 120 ÷ 1.20 = $100

↔️ Percentage Difference

% Diff = |A − B| ÷ ((A + B) ÷ 2) × 100

Example: 40 vs 60 → |40−60| ÷ ((40+60)÷2) × 100 = 40%

📖 How to Use the Percentage Calculator

1

Find the Right Calculator

Choose the calculation type that matches your question. There are 8 different calculators for every percentage scenario — from simple percentage finding to tip splitting.

2

Enter Your Numbers

Type your values into the input fields. Results update instantly as you type — no need to press any button. All fields accept decimals.

3

Read the Result and Explanation

The result appears in the green box below each calculator. A plain-English explanation is shown alongside the number so you always understand what the result means.

4

Copy or Review History

Click Copy next to any result to copy it to your clipboard. Your recent calculations are saved in the Calculation History section below the calculators.

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❓ Frequently Asked Questions

How do I calculate a percentage of a number? +
To find X% of Y, use the formula: Result = (X ÷ 100) × Y

Example: What is 20% of 150?
(20 ÷ 100) × 150 = 0.20 × 150 = 30
How do I calculate percentage increase? +
Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100

Example: Price went from $80 to $100.
((100 − 80) ÷ 80) × 100 = (20 ÷ 80) × 100 = 25% increase
How do I calculate percentage decrease? +
Percentage decrease = ((Old Value − New Value) ÷ Old Value) × 100

Example: Price dropped from $100 to $75.
((100 − 75) ÷ 100) × 100 = (25 ÷ 100) × 100 = 25% decrease
What is the difference between percentage change and percentage difference? +
Percentage change measures how a value changed from a specific starting point and has a direction (increase or decrease). It uses the original value as the base.

Percentage difference compares two values with no implied "before" or "after". It uses the average of both values as the base. Use it when neither value is the "original".
How do I find the original price before a discount? +
Use the Find Original Value calculator. The formula is:

Original = Final Price ÷ (1 − Discount%/100)

Example: You paid $75 after a 25% discount.
Original = 75 ÷ (1 − 0.25) = 75 ÷ 0.75 = $100
How do I calculate VAT or sales tax? +
Use the Add a Percentage calculator. Select "Increase by", enter your pre-tax price and the tax rate.

Formula: Final = Price × (1 + Tax%/100)

Example: $200 + 20% VAT = 200 × 1.20 = $240
To find the pre-tax price from a tax-inclusive price, use the Find Original Value calculator with "decrease".