How many electronvolts are in 1 joule?

1 J equals 6.241509e+18 eV. This is an exact conversion factor defined by NIST.

How do I convert joules to electronvolts?

Multiply the value in J by the conversion factor. For example, 10 J = 6.241509e+19 eV. Use our calculator above for instant results.

Is the joules to electronvolts conversion exact?

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

Can I convert joules to electronvolts 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 joules and electronvolts?

Joules (J) and Electronvolts (eV) are both units of energy but belong to different measurement systems. 1 J = 6.241509e+18 eV. Use the converter above to switch between them instantly.

Joules to Electronvolts (J → eV) — Free Online Converter

J → eV Reference Table

J	eV
0.001 J	6.241509e+15 eV
0.002 J	1.248302e+16 eV
0.003 J	1.872453e+16 eV
0.004 J	2.496604e+16 eV
0.005 J	3.120755e+16 eV
0.006 J	3.744905e+16 eV
0.007 J	4.369056e+16 eV
0.008 J	4.993207e+16 eV
0.009 J	5.617358e+16 eV
0.01 J	6.241509e+16 eV
0.02 J	1.248302e+17 eV
0.03 J	1.872453e+17 eV
0.04 J	2.496604e+17 eV
0.05 J	3.120755e+17 eV
0.06 J	3.744905e+17 eV
0.07 J	4.369056e+17 eV
0.08 J	4.993207e+17 eV
0.09 J	5.617358e+17 eV
0.1 J	6.241509e+17 eV
0.2 J	1.248302e+18 eV
0.3 J	1.872453e+18 eV
0.4 J	2.496604e+18 eV
0.5 J	3.120755e+18 eV
0.6 J	3.744905e+18 eV
0.7 J	4.369056e+18 eV
0.8 J	4.993207e+18 eV
0.9 J	5.617358e+18 eV
1 J	6.241509e+18 eV
1.5 J	9.362264e+18 eV
2 J	1.248302e+19 eV
2.5 J	1.560377e+19 eV
3 J	1.872453e+19 eV
3.5 J	2.184528e+19 eV
4 J	2.496604e+19 eV
4.5 J	2.808679e+19 eV
5 J	3.120755e+19 eV
5.5 J	3.432830e+19 eV
6 J	3.744905e+19 eV
6.5 J	4.056981e+19 eV
7 J	4.369056e+19 eV
7.5 J	4.681132e+19 eV
8 J	4.993207e+19 eV
8.5 J	5.305283e+19 eV
9 J	5.617358e+19 eV
9.5 J	5.929434e+19 eV
10 J	6.241509e+19 eV
11 J	6.865660e+19 eV
12 J	7.489811e+19 eV
13 J	8.113962e+19 eV
14 J	8.738113e+19 eV
15 J	9.362264e+19 eV
16 J	9.986415e+19 eV
17 J	1.061057e+20 eV
18 J	1.123472e+20 eV
19 J	1.185887e+20 eV
20 J	1.248302e+20 eV
25 J	1.560377e+20 eV
30 J	1.872453e+20 eV
35 J	2.184528e+20 eV
40 J	2.496604e+20 eV
45 J	2.808679e+20 eV
50 J	3.120755e+20 eV
55 J	3.432830e+20 eV
60 J	3.744905e+20 eV
65 J	4.056981e+20 eV
70 J	4.369056e+20 eV
75 J	4.681132e+20 eV
80 J	4.993207e+20 eV
85 J	5.305283e+20 eV
90 J	5.617358e+20 eV
95 J	5.929434e+20 eV
100 J	6.241509e+20 eV
120 J	7.489811e+20 eV
125 J	7.801886e+20 eV
130 J	8.113962e+20 eV
140 J	8.738113e+20 eV
150 J	9.362264e+20 eV
160 J	9.986415e+20 eV
175 J	1.092264e+21 eV
180 J	1.123472e+21 eV
200 J	1.248302e+21 eV
225 J	1.404340e+21 eV
250 J	1.560377e+21 eV
275 J	1.716415e+21 eV
300 J	1.872453e+21 eV
350 J	2.184528e+21 eV
400 J	2.496604e+21 eV
450 J	2.808679e+21 eV
500 J	3.120755e+21 eV
600 J	3.744905e+21 eV
700 J	4.369056e+21 eV
750 J	4.681132e+21 eV
800 J	4.993207e+21 eV
900 J	5.617358e+21 eV
1000 J	6.241509e+21 eV
1200 J	7.489811e+21 eV
1250 J	7.801886e+21 eV
1500 J	9.362264e+21 eV
1750 J	1.092264e+22 eV
2000 J	1.248302e+22 eV
2500 J	1.560377e+22 eV
3000 J	1.872453e+22 eV
4000 J	2.496604e+22 eV
4500 J	2.808679e+22 eV
5000 J	3.120755e+22 eV
6000 J	3.744905e+22 eV
7000 J	4.369056e+22 eV
7500 J	4.681132e+22 eV
8000 J	4.993207e+22 eV
9000 J	5.617358e+22 eV
10000 J	6.241509e+22 eV
15000 J	9.362264e+22 eV
20000 J	1.248302e+23 eV
25000 J	1.560377e+23 eV
50000 J	3.120755e+23 eV
75000 J	4.681132e+23 eV
100000 J	6.241509e+23 eV

Values based on NIST SP 811 conversion factors

Why Convert Joules to Electronvolts?

Converting between joules (J) and electronvolts (eV) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert J to eV saves time and prevents errors.

Energy conversions from J to eV 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 Joules to Electronvolts

To convert joules to electronvolts, use the following formula:

eV = J × 6.241509e+18

Example: 1 J = 6.241509e+18 eV

For example, 5 J = 3.120755e+19 eV, 10 J = 6.241509e+19 eV, and 100 J = 6.241509e+20 eV. For larger values, 1000 J = 6.241509e+21 eV. Conversely, 1 eV = 1.602177e-19 J. 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 Joule?

The joule (J) is the SI derived unit of energy. Defined as the work done by a force of one newton displacing an object by one meter.

Joules are used in science and engineering to measure work, energy, and heat. In nutrition, kilojoules (kJ) are used in many countries instead of calories.

What is a Electronvolt?

A tiny unit of energy used in atomic physics.

Describes energy levels of particles.

Joules → Electronvolts

Joules to Electronvolts Formula