This instrumentation amplifier calculator finds the gain of the classic three-op-amp in-amp from the gain-setting resistor. Enter the gain resistor and the bridge resistor above.
Formula
Gain = 1 + (2 × R) ÷ Rg
Example
R = 50 kΩ, Rg = 1 kΩ: Gain = 1 + (2 × 50,000) ÷ 1,000 = 101.
Related calculators
Frequently Asked Questions
How do I calculate in-amp gain?
Use gain = 1 + 2R / Rg for the standard three-op-amp instrumentation amplifier.
What sets the gain of an instrumentation amplifier?
A single external gain resistor Rg; a smaller Rg gives a larger gain.
Why use an instrumentation amplifier?
It amplifies small differential signals while rejecting noise common to both inputs, ideal for sensors.