Transmitter Accuracy & Error Calculator
Convert transmitter accuracy specifications into maximum engineering-unit error for percent-of-span or percent-of-reading accuracy statements.
How to use this calculator
- 1
Enter the transmitter LRV and URV.
- 2
Enter the process reading to evaluate.
- 3
Enter the stated accuracy percentage.
- 4
Select % span or % reading and calculate the maximum stated error.
Pressure, differential-pressure, level and temperature transmitters often specify accuracy as a percentage of calibrated span or percentage of reading. Converting that percentage into engineering units makes it easier to judge whether an instrument meets the process requirement.
This tool calculates a simple stated accuracy limit. A complete measurement uncertainty assessment may also need temperature effects, long-term drift, reference uncertainty, resolution, installation and process-condition effects.
Formula and assumptions
The result treats the entered accuracy as a simple ± limit. It does not combine temperature effects, repeatability, drift, reference uncertainty or installation error.
Examples and guidance
- ±0.25% FS on a 0–10 bar span equals ±0.025 bar.
- At a 6 bar reading, ±0.5% of reading equals ±0.03 bar.
Continue your calculation
Move between related pressure, level, flow, signal and measurement calculations without starting a new search.
Questions and answers
What is the difference between percent span and percent reading?
Percent span remains constant across the calibrated range. Percent reading changes with the magnitude of the measured value.
Does accuracy equal total measurement uncertainty?
No. Total uncertainty can also include reference accuracy, temperature effects, drift, installation, resolution and process conditions.
Can I enter a ranged-zero transmitter?
Yes. Span is calculated from the absolute difference between URV and LRV, including suppressed or elevated ranges.