Picojoule is 1e-12 joule units.
Picojoules to Kilocalories Converter — pJ to kcal
Convert Picojoule (pJ) to Kilocalorie (kcal) using the exact conversion factor (1 picojoule = 2.390057e-16 kilocalorie). See the formula, worked examples, and conversion table.
Picojoules 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-12 / 4184.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Picojoules to Kilocalories
Picojoule and Kilocalorie both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Picojoule is 1e-12 joule units, and a kilocalorie is 1,000 calories.
Formula
kilocalories = picojoules × 2.390057e-16
This factor comes from each unit's defined relationship to the category's base unit: 1 picojoule equals 1e-12 base units, and 1 kilocalorie equals 4184 base units, so dividing one by the other gives the direct picojoule-to-kilocalorie factor of 2.390057e-16.
Simple example
1 pJ × 2.390057e-16 = 2.390057e-16 kcal
1 picojoule = 2.390057e-16 kilocalories.
Real-world example
100 pJ × 2.390057e-16 = 2.390057e-14 kcal
100 picojoules = 2.390057e-14 kilocalories.
Conversion table
| Picojoule (pJ) | Kilocalorie (kcal) |
|---|---|
| 1 pJ | 2.390057e-16 kcal |
| 10 pJ | 2.390057e-15 kcal |
| 100 pJ | 2.390057e-14 kcal |
| 500 pJ | 1.195029e-13 kcal |
| 1,000 pJ | 2.390057e-13 kcal |
| 2,000 pJ | 4.780115e-13 kcal |
Reverse conversion: Kilocalorie to Picojoule
2.390057e-16 kcal × 4.184e+15 = 0.9999998488 pJ
2.390057e-16 kilocalories = 0.9999998488 picojoules.
picojoules = kilocalories × 4.184e+15
For a page dedicated to this direction, see Kilocalorie to Picojoule.
Understanding the Picojoule (pJ)
Picojoule is 1e-12 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 picojoule?
1 picojoule equals 2.390057e-16 kilocalories, using the exact defined conversion factor rather than an estimate.
How do I convert picojoule to kilocalorie?
Multiply the picojoule value by 2.390057e-16. The converter above does this instantly to whatever precision you set.
How do I convert kilocalorie back to picojoule?
Use the reverse factor: 1 kilocalorie equals 4.184e+15 picojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a picojoule?
Picojoule (pJ) is a unit of energy.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of energy.
Is the picojoule to kilocalorie conversion exact?
Yes. Both picojoule and kilocalorie are defined by fixed standards rather than physical artifacts, so the factor of 2.390057e-16 used above is exact to as many digits as you choose to display.