Percentage Calculator
Enter the values below to get instant results. This calculator is useful for everyday maths, pricing, discounts, statistics and general number comparisons.
More Calculators
How the Percentage Calculator Works
Common Percentage Calculations Explained
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?
About This Percentage Calculator
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
It can calculate percentages of a number, determine what percentage one number is of another and adjust values by a percentage increase or decrease.
No. This calculator includes percentage increases and decreases, but there is a separate tool dedicated specifically to percentage change between two values.
Yes. To find a discount, simply use the ‘Decrease by Y%’ function. To add standard UK tax, use the ‘Increase by Y%’ function and enter 20%. While this works perfectly for everyday checks, we recommend our dedicated VAT Calculator for formal invoice processing.
Yes, the calculator provides exact mathematical results based on the numbers you enter. However, if you are working with infinitely repeating decimals (like 33.333%), you may need to round the final answer up or down to the nearest whole penny or decimal point depending on your needs.
Yes. All calculators on Calchub are free to use.
Disclaimer
Last checked/updated February 2026.