Shunt & Prediction-Check Calculator

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Current you want to measure mA — 30 µA is 0.030

Shunt resistance Ω

Supply rail V

Your meter's smallest step mV

Predicted average mA

Measured average mA

Pack capacity mAh

Wake interval s

Awake current mA

Awake window s

Sleep current mA

One-off per cycle mA·s

Enter a current to measure and a shunt value, then press Calculate.

From the book — Chapter 13. A shunt is Ohm's law backwards: you know R, you measure V, I = V ÷ R. Big enough to read (tens of mV), small enough not to matter (under 1% of the rail).

Chapter 13, including the one further test that separates two suspects. Everything stays in your browser — no sign-up, nothing stored.