Your result
Click Calculate
Enter your values, then click Calculate result.How this calculator helps
Translate milliamp-hours into a rough runtime using average device current and a usable-capacity allowance. Testing several power-draw assumptions gives a more honest range than comparing battery capacity alone.
How to use it
- 1
Enter rated battery capacity from reliable specifications.
- 2
Use an average current based on a similar measured workload.
- 3
Set a usable percentage that allows for conversion loss and battery condition.
Formula and methodology
Estimated runtime = battery capacity × usable percentage ÷ average current draw.
Applies the displayed mathematical relationship directly to the values entered. Users should verify units and any institution-specific interpretation.
Worked calculation example
A 5,000 mAh battery at 90% usable capacity and an average 600 mA load gives about 7.5 hours of equivalent active use.
How to interpret your result
Estimate screen-on and mixed-use battery life from capacity and average power draw. Read the main result together with the supporting values rather than treating one number as a guarantee. The disclosed method is: Estimated runtime = battery capacity × usable percentage ÷ average current draw.
Input guide
Enter rated battery capacity from reliable specifications.
Use an average current based on a similar measured workload.
Set a usable percentage that allows for conversion loss and battery condition.
Scenario comparison
| Scenario | What it demonstrates |
|---|---|
| Worked baseline | A 5,000 mAh battery at 90% usable capacity and an average 600 mA load gives about 7.5 hours of equivalent active use. |
| Network signal check | Weak mobile signal can raise modem power consumption. |
| Display demand stress test | Brightness, resolution and refresh rate strongly affect runtime. |
Common mistakes to avoid
- Ignoring network signal: Weak mobile signal can raise modem power consumption.
- Overlooking display demand: Brightness, resolution and refresh rate strongly affect runtime.
- Failing to test battery ageing: Usable capacity normally declines with age, heat and charging cycles.
Confirm current price, specifications, warranty and approval status directly before purchasing a phone.
What can affect the result?
Network signal
Weak mobile signal can raise modem power consumption.
Display demand
Brightness, resolution and refresh rate strongly affect runtime.
Battery ageing
Usable capacity normally declines with age, heat and charging cycles.
Limits of this estimate
A constant-current estimate cannot reproduce changing workloads, standby drain, modem conditions, temperature, battery management or laboratory endurance tests.
Sources and review information
Frequently asked questions
Is the mobile battery life estimator free?＋
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?＋
No. Calculations run locally in your browser and the values you enter are not sent to a server.
Should I treat the result as an exact bill or quotation?＋
No. Results are informed estimates. Final charges can vary because of taxes, tariffs, lender terms, usage patterns, or provider rules.
How can I improve the accuracy?＋
Use recent values from your own bill, statement or institution, review every assumption, and confirm important results with the relevant official source.
Why can two 5,000 mAh phones last differently?＋
Chipset efficiency, signal strength, display, refresh rate, software and usage patterns can create large differences.