Percentage Calculator
Calculate percentage increase, percentage decrease, ratios and percent changes instantly and accurately.
Percentage Tool
About This Percentage Calculator
This percentage calculator helps you compute percent increase, percent decrease, ratio comparisons, and general percent changes instantly. Whether you want to measure price changes, growth rates, savings, discounts, statistics, or math problems — this tool gives fast and accurate results.
Ideal for students, financial analysts, business owners, teachers, accountants and anyone who works with numbers on a daily basis.
Percentage Calculator — FAQ
1. How is percent change calculated?
Percent Change = ((New Value − Original Value) / Original Value) × 100.
2. What is percentage increase?
If the new value is greater than the original value, the result is a positive percentage.
3. What is percentage decrease?
If the new value is smaller than the original value, the result is a negative percentage.
4. Does this tool support ratios?
Yes — percent change is effectively a ratio comparison between two values.
5. Why must the original value not be zero?
Percent change formula divides by the original value — division by zero is undefined.