EV CHARGING
Tesla Charging Calculator
Estimate Tesla charging time, energy use and cost using your battery capacity, charge level, charger power and electricity rate.
Open calculator : Tesla Charging Calculator: Time & CostA LITTLE CHARGING MATH
Charging Calculators
Time for a top-up, or power for the whole day? Work out the numbers with clear assumptions you can change.
Looking for somewhere to plug in? Find chargersELECTRICAL CONVERSION
Watts to Amps Calculator
Convert watts to amps or amps to watts using voltage and electrical mode. Get a clear result, formula and worked examples.
Open calculator : Watts to Amps CalculatorBATTERY BASICS
mAh to Wh Calculator
Convert mAh to Wh or Wh to mAh using your battery's voltage. Check common power-bank examples and understand the capacity label.
Open calculator : mAh to Wh CalculatorBATTERY BASICS
Battery Runtime Calculator
Estimate how long a battery can run your devices using capacity, voltage, power draw and editable usable-energy assumptions.
Open calculator : Battery Runtime CalculatorBATTERY BASICS
Battery Charging Time Calculator
Estimate battery recharge time from capacity, charge level and charging current. See the assumptions and how taper can affect the result.
Open calculator : Battery Charging Time CalculatorUNDERSTAND THE WHY
A little know-how goes a long way.
Read our guides to charging speed, home charging, and everyday cables.