๐Ÿงฎ Calculators & Daily Life

Percentage Calculator

Four blocks, four common percentage questions. Type in your numbers and the answer appears โ€” no mental arithmetic needed. Your input stays in your browser.

Examples (click to try)
โ‘  What percent is A of B?
Enter A and B โ€” the ratio appears here

Formula: A รท B ร— 100

โ‘ก What is A% of B?
Enter A and B โ€” the actual value appears here

Formula: B ร— A รท 100

โ‘ข Percentage change from A to B
Enter A and B โ€” the percentage change appears here

Formula: (B โˆ’ A) รท A ร— 100

โ‘ฃ Increase / decrease A by P%
Enter A and P โ€” the new value appears here

Formula (increase): A ร— (1 + P รท 100)ใ€€ใ€€(decrease): A ร— (1 โˆ’ P รท 100)

How to Use the Percentage Calculator

There are four independent calculation blocks. Simply type numbers into the fields of the block you need โ€” results appear in real time (there's no button to press; the answer updates the moment you type). Each result includes a copy button so you can grab the answer quickly. You can also click one of the "Examples (click to try)" chips at the top to fill in sample values and see the result right away.

For example, say you want to know the sale price of a $1,000 item at 20% off. In block โ‘ฃ, enter 1000 for A and 20 for P, then set the operation to "Decrease" โ€” the result shows 800 (= 1,000 ร— (1 โˆ’ 20 รท 100)). If you instead want the discount amount itself ($200), enter A=20 and B=1000 in block โ‘ก, and it shows 200.

  • โ‘  What percent is A of B: Find the ratio as a percentage. Example: 75 out of 300 โ†’ 25%
  • โ‘ก What is A% of B: Find the actual value from a percentage. Example: 30% of 2,000 โ†’ 600
  • โ‘ข Percentage change: Find how much a value changed, expressed as a percentage. Example: 1,000 โ†’ 1,200 โ†’ 20% increase
  • โ‘ฃ After % increase/decrease: Find the result of applying a percentage increase or decrease. Example: 5,000 with a 20% discount โ†’ 4,000

Common use cases

  • Calculating sale or discount prices (how much is X% off?)
  • Working out prices with or without sales tax (e.g. 8% or 10% tax)
  • Checking a test score or achievement rate as a percentage
  • Finding year-over-year percentage change for sales figures or population
  • Understanding how much an asset or salary has grown in percentage terms

Frequently Asked Questions

Is my input data sent to a server?
No. All calculations run entirely in your browser. Your input is never transmitted to or stored on any server, so you can use this tool with confidence.
How are decimal places handled in the results?
Results are calculated to four decimal places, with trailing zeros removed before display. Copy the result as needed for your own use.
Does this tool work on smartphones?
Yes. The tool works in any browser on smartphones, tablets, and PCs. No installation or account is required.