Battery Budget Calculator

Home › Calculators › The Battery Budget

Awake current mA — everything that is on

Awake window seconds

Sleep current mA — 30 µA is 0.030

Wake interval seconds

One-off charge per cycle mA·s — a blink, a write, a message

Pack, design capacity mAh

Enter your currents and a wake interval, then press Calculate.

From the book — Chapter 3. cycle = (awake mA × awake s) + (one-off mA·s) + (sleep mA × the rest). average = cycle ÷ interval. runtime = mAh ÷ average.

This is the budget sheet at the back of the book, with the arithmetic done for you. Everything stays in your browser — no sign-up, nothing stored.