How many watt-hours are in 1 kilowatt-hour?

1 kWh equals 1000 Wh. This is an exact conversion factor defined by NIST.

How do I convert kilowatt-hours to watt-hours?

Multiply the value in kWh by the conversion factor. For example, 10 kWh = 10000 Wh. Use our calculator above for instant results.

Is the kilowatt-hours to watt-hours conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert kilowatt-hours to watt-hours offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between kilowatt-hours and watt-hours?

Kilowatt-hours (kWh) and Watt-hours (Wh) are both units of energy but belong to different measurement systems. 1 kWh = 1000 Wh. Use the converter above to switch between them instantly.

Kilowatt-hours to Watt-hours (kWh → Wh) — Free Online Converter

kWh → Wh Reference Table

kWh	Wh
0.001 kWh	1 Wh
0.002 kWh	2 Wh
0.003 kWh	3 Wh
0.004 kWh	4 Wh
0.005 kWh	5 Wh
0.006 kWh	6 Wh
0.007 kWh	7 Wh
0.008 kWh	8 Wh
0.009 kWh	9 Wh
0.01 kWh	10 Wh
0.02 kWh	20 Wh
0.03 kWh	30 Wh
0.04 kWh	40 Wh
0.05 kWh	50 Wh
0.06 kWh	60 Wh
0.07 kWh	70 Wh
0.08 kWh	80 Wh
0.09 kWh	90 Wh
0.1 kWh	100 Wh
0.2 kWh	200 Wh
0.3 kWh	300 Wh
0.4 kWh	400 Wh
0.5 kWh	500 Wh
0.6 kWh	600 Wh
0.7 kWh	700 Wh
0.8 kWh	800 Wh
0.9 kWh	900 Wh
1 kWh	1000 Wh
1.5 kWh	1500 Wh
2 kWh	2000 Wh
2.5 kWh	2500 Wh
3 kWh	3000 Wh
3.5 kWh	3500 Wh
4 kWh	4000 Wh
4.5 kWh	4500 Wh
5 kWh	5000 Wh
5.5 kWh	5500 Wh
6 kWh	6000 Wh
6.5 kWh	6500 Wh
7 kWh	7000 Wh
7.5 kWh	7500 Wh
8 kWh	8000 Wh
8.5 kWh	8500 Wh
9 kWh	9000 Wh
9.5 kWh	9500 Wh
10 kWh	10000 Wh
11 kWh	11000 Wh
12 kWh	12000 Wh
13 kWh	13000 Wh
14 kWh	14000 Wh
15 kWh	15000 Wh
16 kWh	16000 Wh
17 kWh	17000 Wh
18 kWh	18000 Wh
19 kWh	19000 Wh
20 kWh	20000 Wh
25 kWh	25000 Wh
30 kWh	30000 Wh
35 kWh	35000 Wh
40 kWh	40000 Wh
45 kWh	45000 Wh
50 kWh	50000 Wh
55 kWh	55000 Wh
60 kWh	60000 Wh
65 kWh	65000 Wh
70 kWh	70000 Wh
75 kWh	75000 Wh
80 kWh	80000 Wh
85 kWh	85000 Wh
90 kWh	90000 Wh
95 kWh	95000 Wh
100 kWh	100000 Wh
120 kWh	120000 Wh
125 kWh	125000 Wh
130 kWh	130000 Wh
140 kWh	140000 Wh
150 kWh	150000 Wh
160 kWh	160000 Wh
175 kWh	175000 Wh
180 kWh	180000 Wh
200 kWh	200000 Wh
225 kWh	225000 Wh
250 kWh	250000 Wh
275 kWh	275000 Wh
300 kWh	300000 Wh
350 kWh	350000 Wh
400 kWh	400000 Wh
450 kWh	450000 Wh
500 kWh	500000 Wh
600 kWh	600000 Wh
700 kWh	700000 Wh
750 kWh	750000 Wh
800 kWh	800000 Wh
900 kWh	900000 Wh
1000 kWh	1000000 Wh
1200 kWh	1200000 Wh
1250 kWh	1250000 Wh
1500 kWh	1500000 Wh
1750 kWh	1750000 Wh
2000 kWh	2000000 Wh
2500 kWh	2500000 Wh
3000 kWh	3000000 Wh
4000 kWh	4000000 Wh
4500 kWh	4500000 Wh
5000 kWh	5000000 Wh
6000 kWh	6000000 Wh
7000 kWh	7000000 Wh
7500 kWh	7500000 Wh
8000 kWh	8000000 Wh
9000 kWh	9000000 Wh
10000 kWh	10000000 Wh
15000 kWh	15000000 Wh
20000 kWh	20000000 Wh
25000 kWh	25000000 Wh
50000 kWh	50000000 Wh
75000 kWh	75000000 Wh
100000 kWh	100000000 Wh

Values based on NIST SP 811 conversion factors

Why Convert Kilowatt-hours to Watt-hours?

Converting between kilowatt-hours (kWh) and watt-hours (Wh) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert kWh to Wh saves time and prevents errors.

Energy conversions from kWh to Wh are crucial for dietitians, physicists, and engineers. In nutrition, understanding the link between calories and joules helps individuals manage their diet and energy intake effectively. In the power sector, converting between kilowatt-hours and British Thermal Units (BTU) is necessary for sizing heating and cooling systems for homes and offices. Physicists rely on precise energy unit conversions to calculate work, heat, and thermodynamic processes. Whether tracking fitness goals or analyzing home energy bills, accurate conversion empowers users to make better health and financial decisions.

How to Convert Kilowatt-hours to Watt-hours

To convert kilowatt-hours to watt-hours, use the following formula:

Wh = kWh × 1000

Example: 1 kWh = 1000 Wh

For example, 5 kWh = 5000 Wh, 10 kWh = 10000 Wh, and 100 kWh = 100000 Wh. For larger values, 1000 kWh = 1000000 Wh. Conversely, 1 Wh = 0.001 kWh. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Calorie confusion: Food 'Calories' are actually kilocalories (kcal).
Joule scale: 1 kWh is 3.6 million Joules (orders of magnitude difference).
Power vs Energy: mixing up Watts (power) and Watt-hours (energy).

Pro Tips

Food labels: Learn to read kcal; average adult needs ~2000 kcal/day.
Battery capacity: Wh = V * Ah. Useful for comparing different voltage batteries.
Efficiency: Energy cannot be created/destroyed, only converted (with some loss as heat).

What is a Kilowatt-hour?

The kilowatt-hour (kWh) is a unit of energy equal to 3.6 megajoules. It represents the energy consumed by a 1,000-watt appliance running for one hour.

Kilowatt-hours are the standard unit for electricity billing worldwide. It measures residential and industrial electrical energy consumption.

What is a Watt-hour?

A unit of energy equivalent to one watt of power expended for one hour.

Used for battery capacity.

Kilowatt-hours → Watt-hours

Kilowatt-hours to Watt-hours Formula