Free Percentage Calculator
Instantly find X% of Y or calculate what percent one number is of
another.
🔒 100% Private • ⚡ Works Offline
What Is This Percentage Calculator?
This is a completely free, instant, and private
online percentage calculator designed to help you
solve math problems in seconds. Unlike other tools, this runs 100% in
your browser.
-
X% of Y Calculator: Find the percentage of a number
(e.g., "What is 15% of 250?").
-
Percentage Difference: Find what percent one number
is of another (e.g., "75 is what percent of 300?").
🔒 Privacy Note: No data is sent to any server. Everything works
offline.
How to Use These Tools
We kept it simple. There are two modes:
1. Find X% of Y
Enter the percentage and the total number.
Example: Type 18 and 450 →
Result: 81.
2. What Percentage is A of B?
Enter the "Part" and the "Whole."
Example: Type 45 (Part) and
180 (Whole) → Result: 25%.
How to Calculate Percentage Manually (Formulas)
Need to do this without a tool? Here is the math behind the magic.
Formula 1: Finding the Percentage
Formula:
(Percentage ÷ 100) × Total Value
Example: Calculate 20% of 150
-
Convert percentage to decimal: 20 ÷ 100 = 0.2
- Multiply by the total: 0.2 × 150 = 30
Formula 2: Finding the Part of a Whole
Formula: (Part ÷ Whole) × 100
Example: You scored 45 out of 60. What is your %?
- Divide part by whole: 45 ÷ 60 = 0.75
- Multiply by 100: 0.75 × 100 = 75%
Real-World Percentage Examples
Here are common calculations people search for:
| Question |
Calculation |
Result |
| What is 20% of 150? |
0.20 × 150 |
30 |
| 85 out of 200 is what %? |
(85 ÷ 200) × 100 |
42.5% |
| 12.5% of 800? |
0.125 × 800 |
100 |
| 33 out of 120 is what %? |
(33 ÷ 120) × 100 |
27.5% |