Rontojoule is 1e-27 joule units.
Rontojoules to Kilocalories Converter — rJ to kcal
Convert Rontojoule (rJ) to Kilocalorie (kcal) using the exact conversion factor (1 rontojoule = 2.390057e-31 kilocalorie). See the formula, worked examples, and conversion table.
Rontojoules to Kilocalories converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie is 1,000 calories.
Result = input x 1e-27 / 4184.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Rontojoules to Kilocalories
Rontojoule and Kilocalorie both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Rontojoule is 1e-27 joule units, and a kilocalorie is 1,000 calories.
Formula
kilocalories = rontojoules × 2.390057e-31
This factor comes from each unit's defined relationship to the category's base unit: 1 rontojoule equals 1e-27 base units, and 1 kilocalorie equals 4184 base units, so dividing one by the other gives the direct rontojoule-to-kilocalorie factor of 2.390057e-31.
Simple example
1 rJ × 2.390057e-31 = 2.390057e-31 kcal
1 rontojoule = 2.390057e-31 kilocalories.
Real-world example
100 rJ × 2.390057e-31 = 2.390057e-29 kcal
100 rontojoules = 2.390057e-29 kilocalories.
Conversion table
| Rontojoule (rJ) | Kilocalorie (kcal) |
|---|---|
| 1 rJ | 2.390057e-31 kcal |
| 10 rJ | 2.390057e-30 kcal |
| 100 rJ | 2.390057e-29 kcal |
| 500 rJ | 1.195029e-28 kcal |
| 1,000 rJ | 2.390057e-28 kcal |
| 2,000 rJ | 4.780115e-28 kcal |
Reverse conversion: Kilocalorie to Rontojoule
2.390057e-31 kcal × 4.184e+30 = 0.9999998488 rJ
2.390057e-31 kilocalories = 0.9999998488 rontojoules.
rontojoules = kilocalories × 4.184e+30
For a page dedicated to this direction, see Kilocalorie to Rontojoule.
Understanding the Rontojoule (rJ)
Rontojoule is 1e-27 joule units.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilocalories are in 1 rontojoule?
1 rontojoule equals 2.390057e-31 kilocalories, using the exact defined conversion factor rather than an estimate.
How do I convert rontojoule to kilocalorie?
Multiply the rontojoule value by 2.390057e-31. The converter above does this instantly to whatever precision you set.
How do I convert kilocalorie back to rontojoule?
Use the reverse factor: 1 kilocalorie equals 4.184e+30 rontojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontojoule?
Rontojoule (rJ) is a unit of energy.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of energy.
Is the rontojoule to kilocalorie conversion exact?
Yes. Both rontojoule and kilocalorie are defined by fixed standards rather than physical artifacts, so the factor of 2.390057e-31 used above is exact to as many digits as you choose to display.