Guide / 01
When to use it
Use separate formulas to find the increase from 80 to 95 sales, a 25% discounted price, or the share represented by 36 out of 240 people.
CALC / 012
Percentage Calculator
Calculate shares, percentage change, discounts, and margins.
Private workspaceYour input stays on this device. HaloBench tools run in your browser whenever possible.
Result25.00%
Guide / 02
Quick guide
- Choose share, change from A to B, discount, or percentage amount according to the question you are answering.
- Read the mode label and place the base, comparison, or rate in A and B in the stated order.
- Reverse the calculation against the original amount to check that the percentage and resulting value are consistent.
CHECK
Validate the result
Try known examples: 20 is 25% of 80, 100 to 120 is a 20% increase, and 20% off 100 produces 80.
LIMITS
Know the limits
A share with a zero denominator and a percentage change from zero are undefined and display a dash. Values may be rounded to two decimals without currency-specific rounding rules.
Reference
Input and output example
Actual output depends on your input and browser environment. Verify any value used for an important decision.
- Example input
A = 80, B = 100- Expected output
80% · or 25% increase by selected mode
FAQ
Frequently asked
Does a 20% decrease followed by a 20% increase return to the starting value?
No. A drop from 100 to 80 followed by a 20% increase reaches 96 because each change uses the current value as its base.
Does my data leave this device?
No. This tool is designed to process its working data in your browser. Advertising may load separately, but your tool input is never sent with it.