21 Joules to Calories
Convert 21 joules (J) to calories (cal) with formulas, examples, and conversion tables.
J
cal
21 J = 5.0191 cal
Full precision:5.0191 cal
Step-by-Step Solution
To convert 21 joules to calories, we divide by 4.184 because one calorie equals exactly 4.184 joules.
1 calorie = 4.184 joules
Since there are 4.184 joules in every calorie, we divide our value by this factor:
21 ÷ 4.184 = 5.0191 calories
So 21 joules = 5.0191 calories.
Quick check: 5.0191 × 4.184 = 21 joules
Joules to Calories Conversion Table
| Joules | Calories |
|---|---|
| 1 J | 0.23901 cal |
| 2 J | 0.47801 cal |
| 3 J | 0.71702 cal |
| 4 J | 0.95602 cal |
| 5 J | 1.195 cal |
| 10 J | 2.3901 cal |
| 20 J | 4.7801 cal |
| 21 J | 5.0191 cal |
| 50 J | 11.9503 cal |
| 100 J | 23.9006 cal |
21 Joules in Other Units
| Unit | 21 J = |
|---|---|
| Joules to Kilojoules | 0.021 kJ |
| Joules to Megajoules | 0.000021 MJ |
| Joules to Gigajoules | 2.1e-8 GJ |
| Joules to Watt-hours | 0.0058333 Wh |
| Joules to Kilowatt-hours | 0.00000583 kWh |
| Joules to Megawatt-hours | 5.8333e-9 MWh |
| Joules to Calories | 5.0191 cal |
| Joules to Kilocalories | 0.0050191 kcal |
| Joules to BTU | 0.019904 BTU |
| Joules to Therms | 1.9904e-7 therm |
| Joules to Foot-pounds | 15.4888 ft·lb |
| Joules to Electronvolts | 1.3107e+20 eV |
| Joules to Ergs | 210000000 erg |