How do you convert kilojoules to megawatt-hours?

To convert kilojoules (kJ) to megawatt-hours (MWh), multiply the energy in kilojoules by 2.777778e-7 (megawatt-hours = kilojoules × 2.777778e-7).

What is 5 kilojoules in megawatt-hours?

5 kilojoules (5 kJ) is equal to 0.00000138 megawatt-hours (0.00000138 MWh).

Which is larger, 1 kilojoule (kJ) or 1 megawatt-hour (MWh)?

One megawatt-hour (MWh) is larger than one kilojoule (kJ). Specifically, 1 MWh equals 3,600,000 kJ, while 1 kJ is 2.777778e-7 MWh.

How do I convert back from megawatt-hours (MWh) to kilojoules (kJ)?

To reverse the calculation from MWh to kJ, multiply your megawatt-hour value by the inverse factor 3,600,000 (or divide by 2.777778e-7). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round kJ to MWh results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 kJ ≈ 0.00 MWh). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Kilojoules to Megawatt-hours Converter

Enter the energy in kilojoules below to convert it to megawatt-hours.

Megawatt-hours to Kilojoules (MWh → kJ)

Convert Kilojoules to Megawatt-hours

Enter a value in kilojoules (kJ) to convert to megawatt-hours (MWh).

Value (kJ)

From

Result

•

0.000001389megawatt-hours

5 kJ = 0.000001389 MWh

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Suggested Conversions

Reference:NIST CODATA (CODATA Energy & Thermodynamic Constants)

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Kilojoule to Megawatt-hour Conversion Table

Table showing various kilojoule measurements converted to megawatt-hours. Click any preset value or arrow to load it into the converter.

Kilojoules (kJ)	Megawatt-hours (MWh)
1 kJ	0.000000278 MWh
10 kJ	0.000002778 MWh
100 kJ	0.000027778 MWh
1,000 kJ	0.000277778 MWh
10,000 kJ	0.0027778 MWh
100,000 kJ	0.0277778 MWh
1,000,000 kJ	0.2777778 MWh
5,000,000 kJ	1.3888889 MWh
10,000,000 kJ	2.7777778 MWh
25,400,000 kJ	7.0555556 MWh

How to Convert Kilojoules to Megawatt-hours

To convert kilojoules to megawatt-hours, multiply the energy by the following conversion ratio: 0.000000278 megawatt-hours/kilojoule.

Since one kilojoule is equal to 0.000000278 megawatt-hours, you can use this simple formula to convert:

megawatt-hours = kilojoules × 0.000000278

The energy in megawatt-hours is equal to the energy in kilojoules multiplied by 0.000000278.

For example, here's how to convert 5 kilojoules to megawatt-hours using the formula above.

megawatt-hours = (5 kJ × 0.000000278) = 0.000001389 MWh

How Many Megawatt-hours Are in a Kilojoule?

There are 0.000000278 megawatt-hours in a kilojoule, which is why we use this value in the formula above.

1 kJ = 0.000000278 MWh|1 MWh = 3,600,000 kJ

Our kilojoule to megawatt-hour calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Kilojoules and megawatt-hours are both units used to measure energy. Keep reading to learn more about each unit.

What Is a Kilojoule?

A kilojoule is a unit of energy equal to 1,000 joules (J), the base unit for energy. Equal to 1,000 Joules. [1]

The kilojoule is classified as a metric and SI-compatible unit of energy. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.

In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilojoule (kJ) a convenient decimal multiple of the joule (J).

In practice, kilojoules (kJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about kilojoules in our Energy Converter.

What Is a Megawatt-hour?

A megawatt-hour is a unit of energy equal to 3,600,000,000 joules (J), the base unit for energy. Equal to 1,000 kilowatt-hours (3.6 Gigajoules). [2]

The megawatt-hour is classified as a metric and SI-compatible unit of energy. Megawatt-hours can be abbreviated as MWh; for example, 1 megawatt-hour can be written as 1 MWh.

In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megawatt-hour (MWh) a convenient decimal multiple of the joule (J).

In practice, megawatt-hours (MWh) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about megawatt-hours in our Energy Converter.

When converting energy between kilojoules (kJ) and megawatt-hours (MWh), keep full floating-point precision (1 kJ = 0.000000278 MWh; 1 MWh = 3,600,000 kJ) during intermediate calculations and round only the final megawatt-hour figure to match your instrument tolerance.

More Kilojoule & Megawatt-hour Conversions

Need to calculate in the opposite direction? Use our megawatt-hours to kilojoules calculator to switch your starting unit immediately. You can also explore related tools such as converting megawatt-hours to kilojoules, converting kilojoules to joules, or converting kilojoules to kilocalories.

Convert from Kilojoules

Convert to Megawatt-hours

Frequently Asked Questions

There are 2.777778e-7 megawatt-hours (MWh) in 1 kilojoule (kJ). Conversely, 1 megawatt-hour (MWh) is equal to 3,600,000 kilojoules (kJ).

Energy Converter

Quick Info

Direct Factor: 1 kilojoule (kJ) equals 2.777778e-7 megawatt-hours (MWh).
Inverse Factor: 1 megawatt-hour (MWh) equals 3,600,000 kilojoules (kJ).
Formula: megawatt-hours = kilojoules × 2.777778e-7.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Kilojoule (kJ)

Equal to 1,000 Joules.

Megawatt-hour (MWh)

Equal to 1,000 kilowatt-hours (3.6 Gigajoules).

Joule (J)

Coherent SI unit of energy and work (1 W·s = 1 N·m).

References

[1]NIST CODATA · CODATA Energy & Thermodynamic Constants
Source
[2]NIST SP 811 · NIST SP 811 App. B.9 (Energy, Work & Heat)
Source
[3]BIPM · Derived SI Unit: Joule (J)
Source

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References

NIST · BIPM · ISO

[1]
NIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilojoules (kJ) to Megawatt-hours (MWh)
NIST CODATA Standard
[2]
NIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilojoule (kJ) & Megawatt-hour (MWh)
NIST SP 811 Specification
[3]
BIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kJ to MWh)
BIPM Reference

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