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🧪 How to Calculate Percent Error

Calculate percent error from a measured and accepted value, keep units and rounding honest, and separate accuracy from precision.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Set up a valid comparisonPrepare a fair comparison between measured and accepted values.Label the values, use the formula, and align their units before calculating.
Calculate and interpret the percentageCalculate percent error and distinguish accuracy from precision.Find the discrepancy, complete a worked example, and interpret the result cautiously.
Use the result responsiblyUse an accepted reference and explain what the result can show.Connect error to a method, then report the calculation with honest limits.

Questions this course answers

Which value belongs in the denominator of the usual percent error formula?

The accepted value supplies the reference scale for the relative comparison.

Why are absolute-value bars commonly used?

The usual percent error reports discrepancy magnitude; direction can be described separately.

What does percent error primarily describe?

It quantifies how close an experimental result is to a reference value.

What must happen before subtracting experimental and accepted values?

Mismatched units create a numerical error unrelated to the measurement difference.

Which statement is most defensible after calculating 5.0% error?

The percentage describes relative discrepancy; precision, acceptability, and uncertainty require additional evidence.

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