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Use the percentage calculator to calculate percentage values, rates, base values, percentage changes, increases or decreases by a percentage, and percentage differences. Each result includes the calculation steps. Free and no sign-up required; calculations run in your browser. For example, 15% of 80 is 12.
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Result
12
15% of 80 is 12.
Calculation steps
Example result
This is what the results look like. Enter your own numbers above to see the result instantly.
Example
How much is 15% of 80?
12
15% of 80 is 12.
Example
What percentage of 80 is 12?
15%
12 is 15% of 80.
Example
12 is 15% of what number?
80
If 12 represents exactly 15%, the base value is 80.
Example
What is the percentage change from 80 to 92?
+15%
From 80 to 92 is an increase of 15%.
Example
What is 80 plus 15%?
92
80 plus 15% equals 92 (increase: 12).
Example
What is the percentage difference between 80 and 92?
13.95%
The percentage difference between 80 and 92 is 13.95%.
Why use this percentage calculator?
How this calculator differs from a calculator app
Six calculations in one tool
Percentage value, percentage rate, base value, change, increase, decrease, and difference: Switch calculation types with one click without losing your numbers.
Calculation steps to follow along
For each result, the calculator shows the formula with your numbers, step by step. This helps you learn percentage calculations instead of just copying a number.
Numbers as you write them
Comma or period as a decimal separator, thousands separators, spaces, and a percent sign at the end: the calculator understands what you enter.
Instantly, no sign-up required
The result appears as you type. The calculation runs entirely in your browser; your numbers are not sent to a server.
Share result
Copy the result as a complete sentence or share a link containing your numbers and chosen calculation method.
Clean rounding
Choose between 0 and 4 decimal places, or let the calculator round automatically. Floating-point errors such as 0.1 + 0.2 will not occur.
How it works
Three steps from question to answer.
Step 1
Choose what you want to find out above: percentage value, percentage rate, base value, percentage change, increase or decrease by a percentage, or the percentage difference between two values.
Step 2
Enter the two numbers in the sentence. For increases or decreases, also choose the direction. Both commas and periods work, and thousands separators such as 1,250.50 are recognised. The result appears immediately.
Step 3
See the result and calculation steps, choose Auto or 0 to 4 decimal places, and copy the result or a link with your numbers.
Percentage calculations
It all comes down to three values: the base value (the whole, 100%), the percentage (the number before the % sign), and the percentage value (the result).
Percentage value
Percentage value = base value × percentage rate ÷ 100
Example: 15% of 80 = 12
Percentage rate
Percentage rate = percentage value ÷ base value × 100
Example: 12 ÷ 80 × 100 = 15%
Base value
Base value = percentage value ÷ percentage rate × 100
Example: 12 ÷ 15% × 100 = 80
To increase, multiply by 1 plus the percentage; to decrease, multiply by 1 minus the percentage. 80 plus 15% is 80 × 1.15 = 92; 80 minus 15% is 80 × 0.85 = 68.
If a rate rises from 10% to 12%, that is an increase of 2 percentage points but a percentage change of +20%. Percentage points are the difference between two percentages; a percentage change is relative to the starting value.
If you only know the value after an increase, work backwards to find the base value: if 92 is 115%, the base value is 92 ÷ 1.15 = 80. Subtracting 15% instead gives you 78.2, which is incorrect.
Percentage change depends on the direction: from 80 to 92 it’s +15%; from 92 to 80 it’s -13.04%. Percentage difference measures the gap against the average of the two numbers and is 13.95% in either direction.
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FAQ
Quick answers about percentage calculations and this calculator.
A percentage calculator does the math for you. Choose a calculation type above, such as “Percentage value” to answer “What is 15% of 80?”, enter the two numbers, and see the result and calculation. Everything runs directly in your browser.
Multiply the base value by the percentage and divide by 100: percentage value = base value × percentage ÷ 100. Example: 15% of 80 is 80 × 15 ÷ 100 = 12.
Divide the percentage value by the base value and multiply by 100: percentage rate = percentage value ÷ base value × 100. For example, 12 out of 80 is 12 ÷ 80 × 100 = 15%. If the base value is 0, the calculator shows a notice instead of a result.
Divide the percentage value by the percentage rate and multiply by 100: base value = percentage value ÷ percentage rate × 100. For example, if 12 is 15%, the base value is 12 ÷ 15 × 100 = 80. You can also reverse an increase this way: if 92 is 115%, the original value was 80.
Subtract the starting value from the final value, divide by the starting value and multiply by 100. From 80 to 92, that’s (92 − 80) ÷ 80 × 100 = +15% (increase). From 92 to 80, it’s −13.04% (decrease). You cannot swap the starting and final values, and the starting value cannot be 0.
To increase a value, multiply it by 1 plus the percentage rate; to decrease it, multiply by 1 minus the percentage rate. 80 plus 15% is 80 × 1.15 = 92; 80 minus 15% is 80 × 0.85 = 68. Use “Increase / Decrease” mode in the calculator; it also shows the amount added or subtracted.
Percentage change measures the difference from the starting value and depends on the order (80 to 92 is +15%; 92 to 80 is −13.04%). Percentage difference compares the gap with the average of the two numbers and is symmetrical: The difference between 80 and 92 is always 13.95%, regardless of order.
Percentage points measure the difference between two percentages; percent describes a relative change. If an interest rate rises from 10 % to 12 %, that's an increase of 2 percentage points, but a percentage change of +20 %.
Yes. The calculator accepts both 12,5 and 12.5, as well as thousands separators such as 1.250,50 or 1,250.50, spaces and a trailing percent sign. For a single group of exactly three digits, such as 1.234, the selected language determines whether the period is a thousands or decimal separator.
No. The calculation runs entirely in your browser; the calculator does not send numbers to a server. When you change anything, the calculation mode and numbers appear in the address bar so you can share them using “Share link”.
Any more questions?
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