Percentage Error Calculator

Calculate how far off your measurement or estimate is from the actual (true) value using this simple percentage error tool.

Formula Used

Percentage Error = (|Approximate − Exact| / |Exact|) × 100

• Always gives a **positive value** (absolute error)
• Shows how far off a measured value is from the correct one

Examples

Example 1: Science Experiment

Exact: 100g | Measured: 96g

Error = 4%, Difference = 4g

Example 2: Rounding Estimate

Exact: 3.1416 | Approx: 3.14

Error = 0.05%

Example 3: Big Miss

Exact: 80 | Approx: 120

Error = 50%

Example 4: Small Error

Exact: 200 | Approx: 199.5

Error = 0.25%