Calculate load-cell tolerance, full-scale capacity, percentage tolerance, or ideal resolution using divisions or ADC bits. kg, lb and g are standard-gravity force equivalents; N is also supported.

Tolerance is based on a supplied % full-scale specification. Ideal resolution is separate from accuracy; actual performance depends on the complete measuring system.

Load capacity, not electrical sensitivity in mV/V. kg, g and lb use standard-gravity force equivalents.

Related Calculators

Load Cell Accuracy Formula

The load cell accuracy calculator converts an accuracy specification expressed as a percentage of full-scale capacity into an absolute error band in the same unit as the load value entered. This is useful when comparing sensors, checking tolerance limits, or translating a datasheet percentage into a practical โ€œplus/minusโ€ value.

LCA = ยฑ (RO ร— P) / (100)
Symbol Meaning Units
LCA Load cell accuracy Same unit as full-scale capacity
RO Full-scale capacity entered into the calculator kg, lb, g, or N
P Percent of full-scale capacity accuracy %

If you need to solve for a different variable, the formula can be rearranged as follows:

RO = (100 ร— LCA) / (P)
P = (100 ร— LCA) / (RO)

How to Calculate Load Cell Accuracy

  1. Enter the full-scale capacity or full-scale load value.
  2. Enter the accuracy as a percent of full-scale capacity.
  3. Multiply the full-scale capacity by the percentage.
  4. Divide by 100 to convert the percentage into an absolute value.
  5. Apply the result as a ± tolerance band.

The result tells you the maximum allowed deviation based on the percentage entered. Because the equation is based on full-scale capacity, the final answer is an absolute value rather than another percentage.

Example Calculations

  • 1,000 kg at 3% accuracy gives ±30 kg.
  • 500 lb at 0.5% accuracy gives ±2.5 lb.
  • 20,000 g at 1% accuracy gives ±200 g.

How to Interpret the Result

  • ± means both directions: the true value may be above or below the displayed value by the calculated amount.
  • Choose the result unit: input quantities convert consistently; the result uses the selected output unit.
  • Larger capacities create larger absolute error bands when the percentage stays the same.
  • Smaller percentages indicate tighter accuracy.

Important Note on Terminology

Use full-scale load capacity, not electrical rated output or sensitivity in mV/V. A percent-of-full-scale specification gives a load-equivalent tolerance only under the manufacturerโ€™s stated conditions; it does not establish total installed-system uncertainty. Ideal resolution is a separate calculation. The ADC modes assume that the entered load span uses the whole ADC input range, with 2N ideal steps; noise-free usable counts may be lower.

Common Mistakes

  • Entering the percentage as a decimal. For 0.5%, enter 0.5, not 0.005.
  • Confusing percent of full-scale capacity with percent of the current reading. This calculator uses the full rated value entered.
  • Mixing units during interpretation. Keep the input and result in the same measurement unit.
  • Assuming accuracy and resolution are the same. A display may show very small increments even if the sensor accuracy band is much larger.

Why This Calculation Matters

Converting a percentage spec into an absolute error value makes load cell selection easier. It helps answer questions like:

  • Is this sensor accurate enough for my process tolerance?
  • How much measurement error is possible at full scale?
  • Which of two load cells provides the tighter allowable error band?

Use the calculator whenever you need a quick and consistent way to translate a load cell accuracy percentage into a practical plus/minus measurement range.