Free Power & Battery Calculators
Free tools to estimate charging time, battery capacity, device runtime, and energy use.
Find what you need in a few clicks to choose the right power bank, charger, battery, or cable.
Power Bank Charge Calculator
Check how many times a power bank can charge your phone and approximate charging time.
Power Tool Battery Runtime Calculator
Calculate power tool battery runtime for Milwaukee M18, DeWalt 20V MAX and FlexVot Batteries other batteries.
Branded Power Banks Charging Calculator
Compare charging performance of branded power banks and estimate how long they may take to charge popular mobile phones.
Power Bank Charging Time Calculator
Estimate how long a power bank may take to recharge.
Battery Capacity Calculator
Estimate the battery capacity needed for your required runtime.
Battery Runtime Calculator
Estimate how long a battery can run a device based on its capacity and power consumption.
Home Backup Power Calculator
I have these appliances. What battery and inverter do I need for 5 hours?
Solar & Battery Sizing Calculator
I know my electrical loads. How large should my complete solar + battery system be?
Electricity Consumption & Cost Calculator
It calculates daily usage, monthly units, estimated electricity cost, annual consumption & costs.
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