Absolute Uncertainty Calculator

Your details

Choose how you know your uncertainty. Use the dataset mode to compute uncertainty directly from repeated readings.
The central measured quantity (e.g. 25.0 cm, 9.81 m/s², 1.200 g).
Uncertainty expressed as a percentage of the measured value.
%
Show an uncertainty-propagation worked example for combining two measurements.
Absolute uncertainty
1

Half-width of the measurement interval (same units as measured value)

Relative uncertainty0.04
Percentage uncertainty4%
Lower bound24
Upper bound26
Lower bound24
Absolute uncertainty (+/-)1
Upper bound26

25 ± 1.0000 (4.00%)

  • Your result is 25 ± 1.0000 in the measurement units.
  • A percentage uncertainty of 4.00% is acceptable for most lab work (1-5%).
  • The true value is estimated to lie in the range [24.0000, 26.0000].
  • When you combine this measurement with others (add, subtract, multiply, divide), use the propagation rules to find the uncertainty of the result.

Next stepEnable the propagation helper to see how this uncertainty combines with other measured quantities.

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