Load Cell Sensitivity Calculator

Calculator Inputs

Rated Capacity

Applied Load

Load Unit Label

Rated Output

mV/V at full scale

Excitation Voltage

Bridge supply in volts

Zero Balance

mV/V offset at zero load

Nonlinearity

% of full scale

Hysteresis

% of full scale

Sensitivity Temp Coefficient

% per °C

Reference Temperature

°C

Operating Temperature

°C

Amplifier Gain

ADC Resolution

Bits

ADC Input Range

Volts

Example Data Table

Sample case: 1000 kg capacity, 2.0 mV/V rated output, 10 V excitation, 250 gain, 0.02%/°C sensitivity coefficient, and 30 °C operating temperature.

Applied Load (kg)	Load Fraction	Adjusted Output (mV)	Amplified Signal (V)
0	0.00	0.000	0.0000
250	0.25	5.010	1.2525
500	0.50	10.020	2.5050
750	0.75	15.030	3.7575
1000	1.00	20.040	5.0100

Formula Used

1) Base sensitivity per load unit
Base Sensitivity = Rated Output ÷ Capacity

2) Electrical sensitivity per load unit
Electrical Sensitivity = Base Sensitivity × Excitation Voltage

3) Load fraction
Load Fraction = Applied Load ÷ Capacity

4) Temperature-adjusted rated output
Adjusted Rated Output = Rated Output × [1 + (Temp Coefficient ÷ 100 × Temperature Change)]

5) Bridge output at load
Bridge Output = Adjusted Rated Output × Load Fraction × Excitation Voltage

6) Zero-offset bridge output
Zero Offset = Zero Balance × Excitation Voltage

7) Amplified signal
Amplified Output = (Bridge Output + Zero Offset) ÷ 1000 × Amplifier Gain

8) Combined span error estimate
Combined Span Error = √(Nonlinearity² + Hysteresis²)

9) Estimated load per ADC count
Load per Count = Capacity × (ADC Range ÷ (2^Bits − 1)) ÷ Full-Scale Amplified Output

How to Use This Calculator

Enter the load cell rated capacity and the actual applied load.
Set the rated output in mV/V from the sensor datasheet.
Enter the bridge excitation voltage supplied to the load cell.
Add zero balance, nonlinearity, and hysteresis values for a more realistic model.
Provide the sensitivity temperature coefficient, reference temperature, and operating temperature.
Enter the amplifier gain used in your signal conditioning stage.
Enter ADC resolution and input range to estimate digital measurement resolution.
Press the calculate button to display the result section above the form.
Review the numerical outputs, the engineering notes, and the Plotly graph.
Use the CSV or PDF buttons to download the calculated results.

FAQs

1) What does load cell sensitivity mean?

Load cell sensitivity describes how much electrical output a sensor produces for a given load. It is often stated in mV/V and links applied force to measurable bridge voltage.

2) Why is rated output shown in mV/V?

mV/V normalizes the sensor output against excitation voltage. This makes the specification useful across different supply levels and simplifies comparison between different load cell models.

3) Why does excitation voltage affect signal size?

A strain-gauge bridge scales its output with supply voltage. Increasing excitation usually increases output signal proportionally, provided the load cell remains within safe operating limits.

4) What is zero balance?

Zero balance is the small output offset present when no load is applied. It shifts the signal baseline and matters when amplifiers or ADC ranges are tight.

5) Why are nonlinearity and hysteresis included?

They estimate how real behavior departs from the ideal straight-line response. Including them helps engineers judge practical error bands, not only theoretical sensitivity.

6) What does the temperature coefficient change?

It adjusts sensitivity as temperature moves away from the reference point. In real installations, thermal drift can noticeably alter bridge output and calibration accuracy.

7) Why calculate load per ADC count?

This shows the smallest theoretical load change represented by one digital code. It helps match the load cell, amplifier, and converter to the desired system resolution.

8) Can this calculator replace full calibration?

No. It supports design estimation and signal planning. Final systems still need real calibration, mechanical verification, wiring checks, and environmental validation under operating conditions.