Nuclear Energy Converter

Convert between nuclear energy units and compare energy output of different nuclear fuels

Nuclear Energy Converter

From:

ℹ️

To:

ℹ️

Conversion Formula:

Megawatt-hours (MWh) × 3.600 = Gigajoules (GJ)

From:

Megawatt-hours (MWh)ℹ️

To:

Gigajoules (GJ)ℹ️

Common Nuclear Energy Conversions

Nuclear Material Calculator

Mass:

Units:

Isotope:

U-235 Properties:

Half-life: 703.8 million years

Energy per Fission: 199.7 MeV

Description: Primary fissile isotope used in most nuclear reactors and weapons

Maximum Energy Release:

Theoretical maximum energy:

1.165787e+25 MWh

(4.196833e+25 GJ or 1.003067e+25 tons of TNT)

To reach 1 MWh:

8.577896e-26 kg of U-235

Note: Values represent theoretical 100% fission. Real-world reactor efficiency is typically 30-40%, and only 3-5% of fuel atoms undergo fission in commercial reactors.

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Nuclear Energy Scale

Input: 1.00 MWh

(1.00 MWh)

Output: 3.60 GJ

(1.00 MWh)

Comparable to: US Household Refrigerator (1 year)

1.7× Modern energy-efficient refrigerator annual power use (0.600 MWh)

Nuclear Fuel Comparison

Uranium-235

Energy Density:

22,800 MWh/kg

(82,080 GJ/kg)

Half-life:

704 million years

Thermal neutron

The main fissile isotope used in nuclear power generation. Makes up only 0.7% of natural uranium.

For 1.00 MWh of energy:

Uranium-235 required:

0.044 grams

Compared to coal:

120× coal

Energy Density Comparison:

Source	MWh/kg	vs Coal	1.00 MWh
🪨1kg Coal	0.00830	1.00×	120kg
🛢️1kg Oil	0.0119	1.43×	84.0kg
🔥1kg Natural Gas	0.0139	1.67×	71.9kg
☢️1kg Uranium-235 (fission)	22,800	2.75 M×	0.044g
☢️1kg Plutonium-239 (fission)	24,800	2.99 M×	0.040g
⚛️Hydrogen Fusion (D-T, 1kg)	120,000	14.46 M×	0.008g
✨Matter-Antimatter (1kg)	25.00 M	3.012e+9×	0.000g

What This Energy Could Power:

🏠

Average US Home (1 year)

Uses 10.8 MWh

0.09

🧊

US Household Refrigerator (1 year)

Uses 0.6 MWh

1.7

📱

Smartphone Charge

Uses 0.000015 MWh

66,667

🚗

Electric Car (100km)

Uses 0.02 MWh

🏙️

Small City (1 day)

Uses 2400 MWh

4.17e-4

🏭

Small Nuclear Plant (1 day)

Uses 28800 MWh

3.47e-5

Nuclear Energy Facts:

• 1kg of uranium-235 can theoretically produce as much energy as 1,500 tons of coal
• Commercial nuclear reactors typically extract only 3-5% of the fuel's potential energy
• Nuclear fusion releases about 4 times more energy per mass than fission
• A typical nuclear power plant produces about the same energy per day as 2.5 million kg of coal
• Nuclear energy produces approximately 10% of world electricity
• There are about 440 nuclear reactors operating in 32 countries
• The energy in 1g of matter (E=mc²) equals 21.5 kilotons of TNT

Nuclear Energy Unit Equivalents

From	To	Multiply By	Example
Joule (J)	Electron-volt (eV)	6.242 × 10¹⁸	1 J = 6.242 × 10¹⁸ eV
Megaelectron-volt (MeV)	Joule (J)	1.602 × 10⁻¹³	1 MeV = 1.602 × 10⁻¹³ J
Kiloton TNT (kt)	Terajoule (TJ)	4.184	1 kt TNT = 4.184 TJ
Megawatt-hour (MWh)	Gigajoule (GJ)	3.6	1 MWh = 3.6 GJ
Uranium-235 Fission	Megaelectron-volt (MeV)	~200	1 fission = ~200 MeV

E = mc²: The Mass-Energy Equivalence

Einstein's famous equation shows that mass can be converted directly to energy.
One gram of matter completely converted to energy would release 9 × 10¹³ joules (90 TJ), equivalent to the energy from burning 21,000 tons of TNT.

Disclaimer:

This calculator provides theoretical information for educational purposes only. Nuclear energy involves complex physics, engineering, and safety considerations not fully represented here. The theoretical energy values shown assume complete conversion of mass to energy or complete fission, which is not achievable in practical applications.

About the Nuclear Energy Converter

Convert between nuclear energy units and compare energy output of different nuclear fuels All conversions run instantly in your browser and nothing you enter is sent to a server.

Common Conversion Formulas

From	To	Formula
Unit A	Unit B	See converter for specific formula
Unit X	Unit Y	Use appropriate conversion factor
Base Unit	Derived Unit	Apply standard conversion equation

Nuclear Energy Converter