Enter the energy consumption and power rating into the calculator to determine the time it takes for the energy to be consumed. This calculator can also evaluate any of the variables given the others are known.
- All Unit Converters
- Electricity, Magnetism, & Electronics Unit Converters
- Watts To Mets Calculator
- Watts To Lux Calculator
- Watts To Photons Per Second Calculator
- Watts to Volts
Watts To Time Formula
The following formula is used to calculate the time it takes for a certain amount of energy to be consumed.
T = E / P
Variables:
- T is the time (in hours when units are consistent, such as Wh with W, or kWh with kW)
- E is the energy used (watt-hours, Wh, or kilowatt-hours, kWh)
- P is the power (watts, W, or kilowatts, kW)
To calculate the time, divide the energy used by the power after converting units so they match (for example, convert kWh to Wh if your power is in W, or convert W to kW if your energy is in kWh). This will give you the duration (time) in hours, which can then be converted to minutes or seconds if needed. This can be useful in estimating the operating cost or energy efficiency of an appliance or system.
| Power (W) | Time (hours) | Time (minutes) | Time (seconds) |
|---|---|---|---|
| 5 | 200.000 | 12000 | 720000 |
| 10 | 100.000 | 6000 | 360000 |
| 15 | 66.667 | 4000 | 240000 |
| 20 | 50.000 | 3000 | 180000 |
| 25 | 40.000 | 2400 | 144000 |
| 30 | 33.333 | 2000 | 120000 |
| 40 | 25.000 | 1500 | 90000 |
| 50 | 20.000 | 1200 | 72000 |
| 60 | 16.667 | 1000 | 60000 |
| 75 | 13.333 | 800 | 48000 |
| 100 | 10.000 | 600 | 36000 |
| 150 | 6.667 | 400 | 24000 |
| 200 | 5.000 | 300 | 18000 |
| 250 | 4.000 | 240 | 14400 |
| 300 | 3.333 | 200 | 12000 |
| 400 | 2.500 | 150 | 9000 |
| 500 | 2.000 | 120 | 7200 |
| 750 | 1.333 | 80 | 4800 |
| 1000 | 1.000 | 60 | 3600 |
| 2000 | 0.500 | 30 | 1800 |
| *Assumes fixed energy E = 1.00 kWh (1000 Wh). Time t = E ÷ P. Hours rounded to 3 decimals. | |||
What is Watts To Time?
Watts to Time is a calculation used to determine how long it takes to use a given amount of energy (for example, in watt-hours (Wh) or kilowatt-hours (kWh)) at a given power draw (in watts (W) or kilowatts (kW)). The time is calculated by dividing energy by power. For the result to be in hours, the units must be consistent (Wh with W, or kWh with kW); otherwise, convert units first (for example, 1 kWh = 1000 Wh).
How to Calculate Watts To Time?
The following steps outline how to calculate the Watts To Time using the formula T = E / P.
- First, determine the energy used (E) in watt-hours (Wh) or kilowatt-hours (kWh).
- Next, determine the power (P) in watts (W) or kilowatts (kW).
- Convert units so they are consistent (Wh with W, or kWh with kW).
- Calculate the time (T) using T = E / P. With consistent units, T will be in hours.
- After calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
energy consumption (E) = 500 watt-hours
power rating (P) = 100 watts
