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Percent Error Calculator

Kalkulator Persentase Kesalahan

Nilai eksperimental (terukur)

Nilai teoritis (diterima)

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Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the Percent Error Calculator in your language. The content below is shown in English.

Apa itu Percent Error Calculator?

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Percent error measures the accuracy of an experimental or measured value compared to an accepted or theoretical value. It expresses the discrepancy as a percentage, making it easy to compare errors across different scales and units.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Cara Percent Error Calculator

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1Percent error = |Experimental − Theoretical| / |Theoretical| × 100%
2The absolute value removes the sign — percent error is always positive
3Signed percent error indicates direction: positive = measured too high, negative = too low
4Used in chemistry, physics, engineering, and manufacturing quality control

Contoh Terpecahkan

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Contoh 1

Diketahui:Measured density: 9.7 g/cm³, True density: 10.0 g/cm³

Hasil:3.0% error

|9.7−10| / 10 × 100 = 3%

Contoh 2

Diketahui:Predicted 50, actual 47

Hasil:6.0% error

|50−47| / 47 × 100 = 6.38%

Acceptable Percent Error by Application

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Field	Typical acceptable error	Notes
Pharmaceutical manufacturing	<1%	Active ingredient content
Engineering / machining	<0.1–2%	Depends on tolerance
Chemical lab experiments	<5%	Educational context
Survey / opinion polls	±3–5%	Sampling error
Medical diagnostics	<5%	Varies by test type
Weather forecasting (24hr)	<10%	Temperature predictions

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Tip Pro

Percent error uses the theoretical (accepted) value in the denominator, not the experimental value. Using the wrong denominator is a common mistake that gives a different — and incorrect — result.

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Tahukah Anda?

NASA's Mars Climate Orbiter was lost in 1999 due to a unit conversion error — one team used metric units while another used imperial. The spacecraft was $327 million. The percent error in trajectory was small, but catastrophic at interplanetary scale.

Referensi

›Approximation error — Wikipedia

Formula-verified for precision

Reviewed October 2026

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