Free Percentage Calculator - Easy Percentage Calculations
Percentage calculations are everywhere in spreadsheets — discounts, tax rates, growth rates, and more. Our free tool handles all common percentage scenarios.
What Is This Tool?
A percentage calculator that handles: what is X% of Y, what percentage is X of Y, what is the percentage increase/decrease from X to Y.
Formula: =A1*B1% calculates X% of Y. =A1/B1*100 gives what percentage A is of B. =(B1-A1)/A1*100 gives percentage change.
How to Use
1
Calculate X% of Y
Enter the percentage and the total. The calculator shows the result. Example: 15% of 200 = 30.
2
Calculate What Percentage X Is of Y
Enter the part and the whole. The calculator shows the percentage. Example: 30 is what % of 200 = 15%.
3
Calculate Percentage Change
Enter the old value and new value. The calculator shows the percentage increase or decrease.
💡 Use this for growth rates, price changes, and performance comparisons.
4
Reverse Percentage Calculation
Enter the result and the percentage to find the original value. Example: 30 is 15% of what = 200.
Benefits
✓Handles all common percentage scenarios
✓Instant results with built-in formulas
✓No manual math required
✓Reusable for any percentage problem
✓Clear step-by-step reference formulas
Frequently Asked Questions
How do I calculate percentage in Google Sheets?
Use =A1*B1 where B1 is the percentage. Or use =A1/B1 and format as percentage.
What is the formula for percentage change?
=(New- Old)/Old*100. A positive result is an increase, negative is a decrease.
How do I calculate a discount percentage?
Use =(Original - Discounted)/Original*100 to find the discount percentage.