About The Percentage Calculator

The Percentage Calculator handles percent change, increase, decrease, and percent-of calculations from a compact set of inputs. It runs locally in your browser for quick arithmetic checks.

How to Use Percentage Calculator Online

1. Enter the base value, comparison value, and percent value.
2. Choose the mode that matches the question you are asking.
3. Click Calculate Percentage and copy the result when needed.

Choosing Options Correctly

Use Percent change for base-to-compare differences, Increase or Decrease for adjusted values, and What is percent of base for part-of-whole calculations.

Common Use Cases

• Calculating discounts during shopping or sales.
• Determining tips based on total bills at restaurants.
• Assessing tax amounts on transactions.
• Converting fractions to percentages for clearer understanding.

Quick FAQ

Is my data uploaded?
No. Percentage calculations run in the browser.

What happens if I enter incorrect values?
The output will reflect those inputs, so check the labels and recalculate with corrected numbers.

Why does percent change reject zero?
A percent change from zero is undefined because it would require dividing by zero.

What is the difference between percent of and percent change?
Percent of finds a portion of a number. Percent change compares an old value to a new value.