Percentage Calculator

Our Percent calculator is built to help you calculate percentages fast and without confusion. Use it to work out discounts, tips, and percentage increase or decrease in value—just enter your numbers and get instant, accurate results.

You can also use our percentage calc the other way around—find the percentage of any number in seconds. Test different values in the fields to see how fast and simple it is, and explore more percentage calculations beyond just finding a percentage of a number.

What Are Percentages and Why Do They Matter?

Percentages are part of everyday life—sales discounts, test marks, interest rates, tips, survey results, and nutrition labels all use them. They make it easy to understand proportions and compare numbers at a glance.

Once you understand percentages and how to calculate them, you can make smarter decisions, spot changes quickly, and feel confident with real-world numbers.

Where You Can Use This Percentage Change Calculator

Percentages show up everywhere in daily life—especially when you’re checking a “% OFF” sale at the mall. You’ll also use them in finance for income and sales tax calculations, and in health for measurements like body fat percentage.

Keep reading to learn:

• How to find a percentage of a number
• The basic percentage formula (made simple)
• Real-world uses of percentages in areas like statistics and physics

How to Use Our Percentage Calculator

Our percentage increase calculator is split into four simple sections, so you can pick the exact calculation you need and get instant results.

1) What is p% of x? (Find a percentage of a number)

• Enter the percentage (p).
• Enter the number (x).
• The result appears instantly.
• Example: 80% of 30 = 24.
• Reverse use: If you got 27 out of 30, the calculator shows your percentage is 90%.

2) x is what percent of y? (Find what percent one number is of another)

• Enter x (the part).
• Enter y (the total).
• The calculator returns the percentage right away.
• Example: 1245 is what percent of 4000? = 31.125%.
• Reverse use: If rent must be 25% of 4000, the maximum rent is 1000.

3) x is p% of what? (Find the original total)

• Enter x (the known value).
• Enter p% (the known percentage).
• Get the full number instantly.
• Example: 10 is 5% of what? = 200.
• Reverse use: 12.5 is 25% of 50.

4) What is x increased/decreased by p%? (Percentage change)

• Enter the starting value (x).
• Choose increase or decrease.
• Enter the percent change (p%).
• See the new value immediately.
• Example: $5 increased by 30% = $6.50.
• Reverse use: If an item costs $44 after a 10% discount, the original price is $48.89.

Keep reading below to learn what percentages mean, how the formulas work, and where percentage calculations are used in real life.

Find X When Y Is P% of X

To calculate the original value (X) when you know a part (Y) and its percentage (P%), use this formula:

X = Y ÷ (P/100)

Example: A football player is lifting 65 lb less than normal, and that 65 lb is 26% of his usual bench press. What is his regular bench press?

• Y = 65, P% = 26%
• Convert 26% to decimal: 26 ÷ 100 = 0.26
• Apply the formula: X = 65 ÷ 0.26
• Result: X = 250

So, 65 is 26% of 250, and the player’s regular bench press is 250 lb.