Percentage Calculator
Use our percentage calculator to solve common percentage problems quickly and easily. This tool helps you calculate percentages in three practical ways, including finding a percentage of a number, working out what percentage one number is of another and calculating values increased or decreased by a percentage.
Enter the values below to get instant results. This calculator is useful for everyday maths, pricing, discounts, statistics and general number comparisons.
Enter the values below to get instant results. This calculator is useful for everyday maths, pricing, discounts, statistics and general number comparisons.
Looking for our dedicated Percentage Increase Calculator?
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Disclaimer: This calculator provides estimates only and is for general informational purposes. Last checked/updated February 2026.
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How the Percentage Calculator Works
This calculator uses standard percentage formulas to answer three common types of percentage questions:
By entering the relevant values, the calculator applies the correct formula and displays the result instantly.
Common Percentage Calculations Explained
What is X% of Y?
This calculation finds a portion of a number.
Example 1: Working out a tip or deposit
If you are splitting a restaurant bill that comes to £85 and you want to leave a 15% tip:
– Enter 15 in the first box and 85 in the second box.
The calculator reveals the tip amount is £12.75. You can use this same method to calculate a 10% deposit on a holiday booking.
X Is What Percentage of Y?
This calculation shows how one number compares to another as a percentage.
Example 2: Working out a test score or target
If you are reviewing a test score where you achieved 45 correct answers out of a possible 60:
– Enter 45 as the first number and 60 as the second.
The calculator shows you scored 75%. This is also highly useful in business for tracking how close you are to hitting a monthly sales target.
What Is X Increased or Decreased by Y%?
This calculation adjusts a number up or down by a given percentage. It is commonly used for price increases, discounts or adjustments.
Example 3: Retail discounts
If you are shopping in a sale and see a £120 jacket discounted by 25%:
– Enter 120 as your starting number and 25 as the percentage decrease.
The calculator shows the discount saves you £30, bringing the new price to £90.
This calculation finds a portion of a number.
Example 1: Working out a tip or deposit
If you are splitting a restaurant bill that comes to £85 and you want to leave a 15% tip:
– Enter 15 in the first box and 85 in the second box.
The calculator reveals the tip amount is £12.75. You can use this same method to calculate a 10% deposit on a holiday booking.
X Is What Percentage of Y?
This calculation shows how one number compares to another as a percentage.
Example 2: Working out a test score or target
If you are reviewing a test score where you achieved 45 correct answers out of a possible 60:
– Enter 45 as the first number and 60 as the second.
The calculator shows you scored 75%. This is also highly useful in business for tracking how close you are to hitting a monthly sales target.
What Is X Increased or Decreased by Y%?
This calculation adjusts a number up or down by a given percentage. It is commonly used for price increases, discounts or adjustments.
Example 3: Retail discounts
If you are shopping in a sale and see a £120 jacket discounted by 25%:
– Enter 120 as your starting number and 25 as the percentage decrease.
The calculator shows the discount saves you £30, bringing the new price to £90.
When Should You Use a Percentage Calculator?
This calculator is useful when you want to:
It provides a simple way to handle common percentage problems in one place.
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About This Percentage Calculator
This percentage calculator uses widely accepted percentage formulas to deliver accurate and easy-to-understand results. It is designed to help users solve everyday percentage questions efficiently.
While suitable for general use and learning, this tool should not be relied upon for specialised or professional calculations.
You can find out more about CalcHub by clicking here.
While suitable for general use and learning, this tool should not be relied upon for specialised or professional calculations.
You can find out more about CalcHub by clicking here.
Frequently Asked Questions
What calculations can this percentage calculator perform?
It can calculate percentages of a number, determine what percentage one number is of another and adjust values by a percentage increase or decrease.
Is this the same as a percentage increase calculator?
Can I use this calculator for discounts or VAT?
Are the results exact?
Is this calculator free to use?
Disclaimer
This calculator provides estimates only and is for general informational use.
Last checked/updated February 2026.
Last checked/updated February 2026.