Low-Power Estimation Calculator

Estimate battery life from sleep/active current, TX bursts, reporting frequency, and temperature effects.

All calculations run in your browser. Optional: save inputs locally on this device.

Common presets

Battery

Battery capacity (mAh)Battery derating factor (%)Self-discharge (% per month)

Currents

Sleep current (uA)Active current (mA)TX current (mA)RX current (mA)

Timing / duty cycle

Active duration per report (ms)TX duration per report (ms)Extra overhead time (ms)Wakeups per interval

Reporting modeReporting interval (seconds)

Temperature factor

Temperature (°C)Model

Approximation only: capacity derates outside 20°C–40°C.

Export / local

Results

Average current

40.99 uA

0.040991 mA

Estimated life

5.57 years

2,032.97 days · 66.79 months · 5.57 years

Breakdown share

Sleep: 24.37%

Active: 26.84%

TX: 48.79%

Export

CSV includes inputs snapshot, computed outputs, and chart series (time, remaining mAh, remaining %).

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How it works

Per reporting interval, charge consumption is computed as sleep + active + TX components in mAh. Average current is then derived from interval charge over interval time.

Q_sleep = I_sleep * (sleep_time / 3600)
Q_active = I_active * (active_time / 3600)
Q_tx = I_tx * (tx_time / 3600)
I_avg = (Q_sleep + Q_active + Q_tx) / (interval_hours)
Life_hours = Effective_capacity / I_avg

Temperature and self-discharge effects are approximations for planning-level estimation.