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Percentage Calculator

This percentage calculator finds a percent of a number, what percent one number is of another, percent change, and an optional percent table.

What do you want to calculate?

Example: 20 for 20%.

Result

20% of 80
16

Percent table

Optional printable-style table of 1% through a chosen percent of an amount. Useful for discounts, grades, tips, and add-ons.

Shows 1% through this percent, up to 100%.

Percent table

Percent values of 100
PercentValuePercentValue
1%126%26
2%227%27
3%328%28
4%429%29
5%530%30
6%631%31
7%732%32
8%833%33
9%934%34
10%1035%35
11%1136%36
12%1237%37
13%1338%38
14%1439%39
15%1540%40
16%1641%41
17%1742%42
18%1843%43
19%1944%44
20%2045%45
21%2146%46
22%2247%47
23%2348%48
24%2449%49
25%2550%50

How to use

  1. To find X% of Y, enter the percent and the number.
  2. To reverse it, enter the part and the whole.
  3. For change, enter the old value and the new value.
  4. Open the percent table if you want 1% through 50% (or up to 100%) of one amount.

Formula

Percent of a number = amount × percent ÷ 100. What percent = part ÷ whole × 100. Percent change = (new − old) ÷ old × 100. The old value cannot be zero.

Example. 20% of 80 is 16. Going from 80 to 100 is a 25% increase. Going from 100 to 80 is a 20% decrease, because the starting value changed.

Frequently asked questions

How do I find a percentage of a number?

Multiply the number by the percent divided by 100. For example, 20% of 80 is 80 × 0.20 = 16.

What is percent change?

Percent change is (new − old) / old × 100. Going from 80 to 100 is a 25% increase. Going from 100 to 80 is a 20% decrease, because the starting (old) value is different.

What is a percentage table?

A percentage table lists percent values of a set amount—useful for discounts, grades, tips, tax add-ons, and markups. This tool can build a 1%–50% table (or up to 100%) for any number you enter.

How do I find what percent one number is of another?

Divide the part by the whole, then multiply by 100. 16 is 20% of 80 because 16 ÷ 80 × 100 = 20. The whole cannot be zero.

Can percent change be negative?

Yes. If the new value is smaller than the old value, percent change is negative (a decrease). If the old value is zero, percent change is undefined because you cannot divide by zero.

Do I need an account to use this calculator?

No. Quick Tools runs entirely in your browser. There is no signup, and your numbers are not sent to a server.

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