Percentage Error Calculator
Calculate how far off a measurement is from the true value.
- Free Online Tool
- Instant Results
- Mobile Friendly
- No Installation
- Secure & Private
Understanding This Calculator
Percentage Error Formula
The percentage error measures the accuracy of a measurement compared to the true value.
Error (%) = (|Measured - Actual| / |Actual|) × 100
Example 1
Measured: 9.8, Actual: 10.0
- Diff: |9.8 - 10.0| = 0.2
- Calculation: (0.2 / 10.0) × 100
- Error: 2.0%
Example 2
Measured: 105, Actual: 100
- Diff: |105 - 100| = 5
- Calculation: (5 / 100) × 100
- Error: 5.0%
How to Use
- Enter the measured (experimental) value.
- Enter the actual (true) value.
Frequently Asked Questions
How do I use the Percentage Error Calculator?
Enter your values in the input fields, and the result will appear instantly.
Is this calculator free to use?
Yes, this calculator is 100% free and does not require any registration or subscription.
Is it mobile-friendly?
Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.