Battery mAh to Hours Calculator

Battery mAh to hours calculator — estimate real smartphone battery life from capacity. Use the free Battery mAh to Hours Calculator below — enter your values and get instant results, right in your browser. Hours = capacity (mAh) ÷ drain (mA). Light 250 mA, moderate 400 mA, heavy 700 mA. Days = hours ÷ 6 (typical daily screen time). A 5000 mAh phone at moderate use ≈ 12.5 hours.

How to use the Battery mAh to Hours Calculator

Phone makers boast about "5000 mAh" but never say what that means in hours. This battery mAh to hours calculator translates capacity into real screen-on time using typical drain rates: light use sips about 250 mA, moderate use around 400 mA, and heavy gaming can pull 700 mA. Compare phones honestly before buying, or check whether your aging battery still holds up.

  1. Enter the battery capacity in mAh (check Settings > Battery or the spec sheet).
  2. Select your Usage intensity: light, moderate or heavy.
  3. Click the Calculate button.
  4. Read the estimated screen-on hours and equivalent days.
  5. Compare capacities when choosing between two phones.

Formula

Hours = capacity (mAh) ÷ drain (mA). Light 250 mA, moderate 400 mA, heavy 700 mA. Days = hours ÷ 6 (typical daily screen time). A 5000 mAh phone at moderate use ≈ 12.5 hours.

Worked example

Phone with 5000 mAh, moderate use. Click Calculate. Screen-on time = 5000 ÷ 400 = 12.5 hours, about 2.1 days at 6 hours daily use. The same phone under heavy gaming gives only 7.1 hours — one long day. Real life runs lower still, since heat, aging and background apps all add drain.

Frequently asked questions

Mostly, but screen size, brightness and chip efficiency matter too — a big screen can drain a big battery faster.

Batteries lose capacity with age and heat — a 2-year-old battery may hold only 80% of its original mAh.

Gaming, video recording, GPS navigation and maximum screen brightness are the biggest power hogs.

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