Percent Error Calculator
What is a Percent Error Calculator?
A Percent Error Calculator is a tool used to determine the percentage difference between an observed (measured) value and an actual (true) value. It helps assess accuracy in experiments, finance, and engineering.
Why Use a Percent Error Calculator?
- To evaluate measurement accuracy in scientific experiments.
- To compare theoretical vs. actual values in finance, physics, or chemistry.
- To identify errors in calculations or predictions.
How to Calculate Percent Error?
The formula is:

- Find the difference between measured and actual values.
- Divide by the actual value to get relative error.
- Multiply by 100 to express it as a percentage.
When to Use It?
- In scientific experiments (e.g., physics, chemistry).
- In business & finance (e.g., profit predictions vs. actual).
- In engineering (e.g., manufacturing tolerances).