Free tool
kWh to kW Calculator
Kilowatt-hours are an amount; kilowatts are a rate. Divide the amount by the time and you get the average rate — which is not the same thing as the peak.
kW = kWh ÷ hours
kW = kWh ÷ hours. 12 kWh over 4 hours is 3 kW; 2 kWh in 45 minutes is about 2.67 kW; a 900 kWh bill over 30 days (720 hours) is 1.25 kW.
Every one of those is an average. The highest kW reached inside the period is higher, and a kWh total can't tell you by how much. Going the other way — power and time to energy — use the kW to kWh calculator.
The energy and the period
Enter an amount of energy and the time it was used over — a bill, a battery discharge, a charging session.
Only if you have a measured or listed peak. It is used for the load factor, never estimated from the kWh.
The answer
Average power
1.25 kW
kW = kWh ÷ hours → 900 ÷ 720 = 1.25 kW = 1,250 W
An average, not a peak
1.25 kW is what a perfectly steady load would draw to use 900 kWh in 720 hours. Real loads switch on and off, so the highest kW inside that period is higher — sometimes many times higher. Anything that has to deliver power at a moment is rated against that peak, which a kWh figure alone cannot tell you.
What this does not tell you
The peak. Only a demand reading, interval data or a load list gives it. Losses. Charging, inverting and storing energy each lose some of it. Your tariff. Some rate schedules bill peak demand in kW separately from energy in kWh — the utility's tariff sets how.
Informational use only, please verify before you rely on it
This reproduces the standard arithmetic relating energy, time and average power (kW = kWh ÷ hours), with an optional load factor (average ÷ a peak you supply). It is a preparation aid, not a measurement and not a determination. It does not find a peak, apply charging, storage or inverter losses, read a utility tariff, or size any equipment. Confirm with a meter, interval data, the equipment ratings and the utility's tariff.
This tool is provided for general informational and educational purposes only. Its output is an illustrative estimate generated from the values you enter and from general assumptions that will not match every deal, market, lender, or homeowner. It is not tax, legal, accounting, financial, or professional advice, and it is not a quote, an offer, a credit decision, or a guarantee of pricing, approval, timing, savings, or eligibility.
You are solely responsible for independently confirming all information presented here including any figures, rates, fees, margins, timelines, tax treatment, and federal, state, local, or utility incentives, with the applicable lender, authority having jurisdiction, and your own qualified tax, legal, and financial advisors before acting on it, relying on it, or presenting it to a homeowner or any third party. Incentive programs, lender terms, and permitting requirements change frequently and vary by jurisdiction.
Seamless Home is not a tax advisor, law firm, lender, or licensed installing contractor, and makes no representation or warranty as to the accuracy, completeness, or currency of the information produced by this tool. To the fullest extent permitted by law, Seamless Home accepts no liability for any decision made or action taken in reliance on it.
Why the answer is labelled “average”
A kWh figure is a total. Dividing it by its period spreads that total evenly across every hour, as if the load never changed — which is useful for comparing bills or sanity-checking a battery discharge, and misleading for anything that has to deliver power at one moment. A house that averages 1.25 kW over a month can easily draw several times that while the dryer, the oven and the air conditioning overlap; the how many watts a house uses guide walks through that gap for a whole home.
That is why the calculator asks for a peak only if you already have one, and uses it for a load factor rather than guessing it. Where a peak matters — a battery's power rating, a circuit, a demand charge — the current behind it comes from the kW to amps calculator, and which circuits a battery can carry at once is the job of the critical load panel planner.
The pure unit change — the same kilowatts expressed as watts — is on the kW to watts calculator, and an appliance's energy from its watts is on the watts to kWh calculator.
Frequently Asked Questions
How do you convert kWh to kW?+
Divide the kilowatt-hours by the hours they were used over: kW = kWh ÷ hours. 12 kWh over 4 hours is 3 kW. For minutes, convert to hours first — 2 kWh in 45 minutes is 2 ÷ 0.75 ≈ 2.67 kW.
How many kW is 1 kWh?+
It depends on the time. 1 kWh used over 1 hour is an average of 1 kW; over 30 minutes it is 2 kW; over 10 hours it is 0.1 kW. A kilowatt-hour is an amount and a kilowatt is a rate, so the conversion always needs a period.
What is my average kW from my electric bill?+
Divide the bill's kWh by the hours in the billing period. A 900 kWh bill over 30 days (720 hours) is an average of 1.25 kW. That is the steady draw that would use the same energy — the house's actual draw swings well above and below it through the day.
Why isn't the average kW the same as the peak?+
Because loads switch on and off. A month's kWh spread evenly over every hour gives a small number, but when an oven, a dryer and the air conditioning run together the draw at that moment is far higher. Only a demand reading, interval data from the utility or a list of what runs at once gives the peak.
What is load factor?+
Load factor is average power divided by peak power over the same period. A house averaging 1.25 kW with an 8 kW peak has a load factor of about 15.6%. The lower the load factor, the further apart energy and peak power are — which is why one can't be read from the other.
How is this different from the kW to kWh calculator?+
kW to kWh goes the other way: power multiplied by time, summed over steps when the power changes, with the peak and average shown. This page starts from an energy total and a period and returns the average power, with an optional load factor.
Is this a determination?+
No. It reproduces the arithmetic relating energy, time and average power as a preparation aid. It does not measure a load, find a peak, apply losses, read a tariff or size any equipment. Confirm with a meter, interval data, the equipment ratings and the utility's tariff.
Related resources
kW to kWh Calculator
The forward direction: power × time, with peak and average kW.
Learn more →Watts to kWh Calculator
Energy from one appliance's watts or amps, with duty cycle and cost.
Learn more →kW to Watts Calculator
The same kilowatts as watts — the pure scale change (× 1,000).
Learn more →kW to Amps Calculator
The current behind a kilowatt figure, with power factor.
Learn more →Critical Load Panel Planner
Which circuits a home battery can actually keep running.
Learn more →Energy and power, read as separate figures
Seamless Home runs the design, permit and interconnection layer for the partners it works with — where a kWh total and a kW rating get read as the different figures they are. Coverage is confirmed per service area rather than promised as blanket availability.
Get In Touch