Percentage Error — How to Calculate Accuracy in Measurements

Use the Free Calculator

Try our Percentage Calculator — instant results, no sign-up.

Overview

Percentage error tells you how accurate a measurement or estimate is compared to the true value. Used extensively in science, engineering, and quality control.

The Formula

Percentage Error = |Measured − True| ÷ True × 100

Standard formula used by professionals worldwide

Worked Example

Step-by-step

Measured 97cm, true value 100cm → error = |97−100|÷100×100 = 3%

Key Points

Accuracy: Results are as accurate as the inputs you provide
Units: Always use consistent units throughout your calculation
Privacy: All calculations on CalcHub Pro run in your browser — nothing is sent to any server

Frequently Asked Questions

What is acceptable percentage error?

Depends on context. Medical devices: <1%. Construction: 1-5%. Estimation: 5-10%.

Difference between percentage error and percentage difference?

Error compares to known true value. Difference compares two measurements without knowing truth.

How to reduce measurement error?

Multiple measurements and averaging. Better equipment. Controlled conditions.

𝕏 Share 💬 WhatsApp

Ready to Calculate?

Free, instant, no sign-up required.

Open Percentage →