Percentage Calculator

Calculate a percentage of any number instantly with this free online Percentage Calculator. Simply enter a value and a percentage to find the result. For example, calculate 20% of 150 in seconds.

✔ Percentage increases & decreases • ✔ Percentage change • ✔ Fast calculations • ✔ Free online calculator

What this calculator does

This Percentage Calculator quickly finds the value of any percentage of a number. Simply enter a number and the percentage you want to calculate, then view the result instantly.

It is ideal for everyday percentage calculations such as working out discounts, VAT amounts, tips, commissions, interest, taxes, and many other situations where you need to calculate a percentage of a value.

The calculator is free to use, works on desktop and mobile devices, and provides fast, accurate results without requiring manual calculations.

How percentages work

A percentage represents a fraction of 100. The symbol "%" means "per hundred".

For example:

• 10% means 10 out of every 100.
• 25% means 25 out of every 100.
• 50% means one half.
• 100% means the entire amount.

Percentages make it easier to compare values of different sizes and are widely used throughout everyday life.

Formula used

The standard percentage formula is:

Percentage Value = Number × Percentage ÷ 100

For example:

• 20% of 150 = 150 × 20 ÷ 100 = 30
• 15% of 80 = 80 × 15 ÷ 100 = 12
• 5% of 200 = 200 × 5 ÷ 100 = 10

Step-by-step examples

Example 1: Shopping Discount

A jacket costs £120 and is reduced by 25%.

• 25% of £120 = £30
• Discount = £30
• Final Price = £90

Example 2: VAT Calculation

A product costs £100 before VAT.

• 20% VAT = £20
• Total Price = £120

Example 3: Salary Increase

A salary increases from £30,000 to £33,000.

• Increase = £3,000
• £3,000 ÷ £30,000 × 100 = 10%
• Percentage Increase = 10%

Example 4: Exam Results

A student scores 42 out of 50 marks.

• 42 ÷ 50 × 100 = 84%
• Result = 84%

Common real-world uses

• Calculating shopping discounts.
• Working out VAT and sales tax.
• Comparing salary increases.
• Measuring investment growth.
• Calculating profit margins.
• Tracking fuel price changes.
• Understanding exam results.
• Comparing statistics and survey results.

Percentage Reference Table

Percentage	Decimal	Fraction
1%	0.01	1/100
5%	0.05	1/20
10%	0.10	1/10
25%	0.25	1/4
50%	0.50	1/2
75%	0.75	3/4
100%	1.00	1

Common mistakes people make

• Forgetting to divide by 100.
• Confusing percentage increase with percentage difference.
• Calculating tax from the wrong value.
• Using the final price instead of the original price when calculating discounts.
• Rounding too early during calculations.

This calculator helps avoid these mistakes by performing calculations automatically.

Frequently Asked Questions

What is 20% of 150?
20% of 150 equals 30.

How do I calculate a percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100.

How do I calculate a percentage decrease?
Subtract the new value from the original value, divide by the original value, and multiply by 100.

Why use a percentage calculator?
It saves time, improves accuracy, and removes the need for manual calculations.

Can I use this calculator for VAT, discounts, and salary increases?
Yes. The same percentage principles apply to all of these calculations.

✔ Free • ✔ Fast • ✔ No signup required • ✔ No DATA collected

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