Measure instrument deviation across any calibrated span. Review signed, absolute, and reading based errors instantly. Export reports, tables, and trend plots without extra tools.
| Case | Lower | Upper | True | Indicated | Signed Error | Absolute Error | % of Full Scale |
|---|---|---|---|---|---|---|---|
| 1 | 0 | 100 | 10.0 | 9.8 | -0.2 | 0.2 | 0.20 |
| 2 | 0 | 100 | 25.0 | 24.6 | -0.4 | 0.4 | 0.40 |
| 3 | 0 | 100 | 50.0 | 50.7 | 0.7 | 0.7 | 0.70 |
| 4 | 0 | 100 | 75.0 | 74.1 | -0.9 | 0.9 | 0.90 |
| 5 | 0 | 100 | 90.0 | 91.2 | 1.2 | 1.2 | 1.20 |
Full scale deflection error shows how far an instrument reading moves from a trusted reference when the difference is compared with the total calibrated span. Engineers use this value during calibration, maintenance work, commissioning checks, and routine quality reviews. It gives a stable basis for comparison because the span stays fixed for the instrument range.
This calculator compares the true value with the indicated value. It then reports signed error, absolute error, percent of reading, and percent of full scale. You can also enter an accuracy class. That extra input helps estimate the maximum permissible error and quickly shows whether the test point stays inside the expected tolerance band.
Span based error is useful for gauges, transmitters, panel meters, sensors, analog indicators, and many electronic measurement devices. A small reading deviation can matter more on a narrow range. The same deviation may matter less on a wide range. This is why full scale analysis remains common in calibration sheets and technical acceptance reports.
Signed Error = Indicated Value − True Value. Absolute Error = |Signed Error|. Full Scale Span = Upper Range − Lower Range. Error (% of Full Scale) = (Signed Error ÷ Full Scale Span) × 100. Absolute Error (% of Full Scale) = (Absolute Error ÷ Full Scale Span) × 100.
If the true value is not zero, Error (% of Reading) = (Signed Error ÷ True Value) × 100. If you enter an accuracy class, Maximum Permissible Error = (Accuracy Class ÷ 100) × Full Scale Span. The calculator also reports the correction to apply, which is the negative of the signed error.
Enter the lower range and upper range first. Add the true reference value next. Then enter the indicated instrument value. Include the accuracy class when a tolerance decision is needed. Submit the form to place the result above the input area. Review the table, check the chart, and export the result as CSV or PDF for records.
It is the measurement error expressed against the full instrument span. This makes different readings easier to compare across the same calibrated range.
Raw error shows the direct difference. Percent of full scale shows how significant that difference is relative to the instrument range.
Signed error equals indicated value minus true value. Positive values mean the instrument reads high. Negative values mean it reads low.
Absolute error removes the sign from the deviation. It shows only the size of the error and is useful for tolerance checks.
That value divides error by the true reading. When the true value is zero, the percentage is undefined, so the calculator shows N/A.
Accuracy class estimates the maximum allowable error as a percentage of full scale. The calculator then compares your absolute error with that limit.
Yes. The method works for many calibrated instruments as long as the lower range, upper range, true value, and indicated value are entered consistently.
It is the opposite of the signed error. You can use it during calibration records to show how much correction would offset the measured deviation.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.