Calculating kWh from amps is quite a challenge. First, we need to convert amps to watts (using voltage), and then we can convert watts to kWh. To make this process easier, we have developed the Amps To kWh Calculator that does all of this automatically.
On top of that, we have also checked how many kWh do different devices (from 1 amp to 1000 amps) use at 12V, 24V, 120V, and 120V voltages if we run them for 1 hour. All the calculations are summarized in the chart below.
First of all, let’s look at what amps and kilowatt-hours (kWh) actually are:
- Amps or amperes are units of electric current. If we multiply amps by voltage, we get watts (units of electric power).
- Kilowatt-hours (kWh) are units of electric energy. If we multiply watts by hours of use, we get watt-hours (Wh). To further convert Wh to kWh, we have to divide Wh by a factor of 1000.
The whole amps to kWh conversion can be written in this formula:
kWh = Amps × Volts × Hours Of Use / 1000
Here is a quick example: Let’s say that we have a 10 amp electric device running on a standard 120V circuit for 5 hours. How to calculate kWh from amps? We use the formula above like this:
kWh Used = 10 Amps × 120 Volts × 5 Hours / 1000 = 6 kWh
This 10 amp electric device will use 6 kWh of electricity.
As we can see, the amps to kilowatt-hour conversion depend on only 3 factors (we will use these 3 factors in the Amp To kWh Calculator further on):
- How many amps we are using (1st slider in the calculator).
- What kind of voltage we are using (2nd slider in the calculator).
- For how long we run the electric device (3rd slider in the calculator).
If we know all these 3 factors, we can easily use this calculator to convert amps to kWh:
Amps To kWh Calculator
To illustrate how this calculator works, you can use the example from above: 10 amp device running on 120V for 5 hours. Just slide the 1st slider to ’10’, 2nd slider to ‘120’, and the 3rd slider to ‘5’. You get the result: Running a 10 amp 120V device for 5 hours consumes 6 kWh of electricity.
This is just one example. Let’s see how many kWh do different amp devices (from 1 amp to 1000 amps) running at 12V, 24V, 120V, and 220V voltages for 1 hour use:
Amps To kWh Chart For 1 Hour Of Use
|Current (Amps):||12V Voltage:||24V Voltage:||120V Voltage:||220V Voltage:|
|1 Amp||0.012 kWh||0.024 kWh||0.12 kWh||0.22 kWh|
|2 Amps||0.024 kWh||0.048 kWh||0.24 kWh||0.44 kWh|
|3 Amps||0.036 kWh||0.072 kWh||0.36 kWh||0.66 kWh|
|4 Amps||0.048 kWh||0.096 kWh||0.48 kWh||0.88 kWh|
|5 Amps||0.060 kWh||0.120 kWh||0.60 kWh||1.10 kWh|
|6 Amps||0.072 kWh||0.144 kWh||0.72 kWh||1.32 kWh|
|7 Amps||0.084 kWh||0.168 kWh||0.84 kWh||1.54 kWh|
|8 Amps||0.096 kWh||0.192 kWh||0.96 kWh||1.76 kWh|
|9 Amps||0.108 kWh||0.216 kWh||1.08 kWh||1.98 kWh|
|10 Amps||0.12 kWh||0.24 kWh||1.20 kWh||2.20 kWh|
|15 Amps||0.18 kWh||0.36 kWh||1.80 kWh||3.30 kWh|
|20 Amps||0.24 kWh||0.48 kWh||2.40 kWh||4.40 kWh|
|30 Amps||0.36 kWh||0.72 kWh||3.60 kWh||6.60 kWh|
|40 Amps||0.48 kWh||0.96 kWh||4.80 kWh||8.80 kWh|
|50 Amps||0.60 kWh||1.20 kWh||6.00 kWh||11.0 kWh|
|60 Amps||0.72 kWh||1.44 kWh||7.20 kWh||13.2 kWh|
|70 Amps||0.84 kWh||1.68 kWh||8.40 kWh||15.4 kWh|
|80 Amps||0.96 kWh||1.92 kWh||9.60 kWh||17.6 kWh|
|90 Amps||1.08 kWh||2.16 kWh||10.8 kWh||19.8 kWh|
|100 Amps||1.20 kWh||2.40 kWh||12.0 kWh||22.0 kWh|
|150 Amps||1.80 kWh||3.60 kWh||18.0 kWh||33.0 kWh|
|200 Amps||2.40 kWh||4.80 kWh||24.0 kWh||44.0 kWh|
|250 Amps||3.00 kWh||6.00 kWh||30.0 kWh||55.0 kWh|
|300 Amps||3.60 kWh||7.20 kWh||36.0 kWh||66.0 kWh|
|350 Amps||4.20 kWh||8.40 kWh||42.0 kWh||77.0 kWh|
|400 Amps||4.80 kWh||9.60 kWh||48.0 kWh||88.0 kWh|
|450 Amps||5.40 kWh||10.8 kWh||54.0 kWh||99.0 kWh|
|500 Amps||6.00 kWh||12.0 kWh||60.0 kWh||110 kWh|
|600 Amps||7.20 kWh||14.4 kWh||72.0 kWh||132 kWh|
|700 Amps||8.40 kWh||16.8 kWh||84.0 kWh||154 kWh|
|800 Amps||9.60 kWh||19.2 kWh||96.0 kWh||176 kWh|
|900 Amps||10.8 kWh||21.6 kWh||108 kWh||198 kWh|
|1000 Amps||12.0 kWh||24.0 kWh||120 kWh||220 kWh|
As you can see, this chart will tell you exactly how many kWh will different amp devices use per hour.
It all depends on voltage:
- 1 amp at 12V will spend 0.012 kWh per hour.
- 1 amp at 24V will spend 0.024 kWh per hour.
- 1 amp at 120V will spend 0.12 kWh per hour.
- 1 amp at 220V will spend 0.22 kWh per hour.
If you still find converting amps to kWh a bit difficult, you can use the comments below, give us some numbers, and we’ll try to help you out as best we can.