Quectojoule is 1e-30 joule units.
Quectojoules to Kilocalories Converter — qJ to kcal
Convert Quectojoule (qJ) to Kilocalorie (kcal) using the exact conversion factor (1 quectojoule = 2.390057e-34 kilocalorie). See the formula, worked examples, and conversion table.
Quectojoules 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-30 / 4184.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Quectojoules to Kilocalories
Quectojoule and Kilocalorie both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Quectojoule is 1e-30 joule units, and a kilocalorie is 1,000 calories.
Formula
kilocalories = quectojoules × 2.390057e-34
This factor comes from each unit's defined relationship to the category's base unit: 1 quectojoule equals 1e-30 base units, and 1 kilocalorie equals 4184 base units, so dividing one by the other gives the direct quectojoule-to-kilocalorie factor of 2.390057e-34.
Simple example
1 qJ × 2.390057e-34 = 2.390057e-34 kcal
1 quectojoule = 2.390057e-34 kilocalories.
Real-world example
100 qJ × 2.390057e-34 = 2.390057e-32 kcal
100 quectojoules = 2.390057e-32 kilocalories.
Conversion table
| Quectojoule (qJ) | Kilocalorie (kcal) |
|---|---|
| 1 qJ | 2.390057e-34 kcal |
| 10 qJ | 2.390057e-33 kcal |
| 100 qJ | 2.390057e-32 kcal |
| 500 qJ | 1.195029e-31 kcal |
| 1,000 qJ | 2.390057e-31 kcal |
| 2,000 qJ | 4.780115e-31 kcal |
Reverse conversion: Kilocalorie to Quectojoule
2.390057e-34 kcal × 4.184e+33 = 0.9999998488 qJ
2.390057e-34 kilocalories = 0.9999998488 quectojoules.
quectojoules = kilocalories × 4.184e+33
For a page dedicated to this direction, see Kilocalorie to Quectojoule.
Understanding the Quectojoule (qJ)
Quectojoule is 1e-30 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 quectojoule?
1 quectojoule equals 2.390057e-34 kilocalories, using the exact defined conversion factor rather than an estimate.
How do I convert quectojoule to kilocalorie?
Multiply the quectojoule value by 2.390057e-34. The converter above does this instantly to whatever precision you set.
How do I convert kilocalorie back to quectojoule?
Use the reverse factor: 1 kilocalorie equals 4.184e+33 quectojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a quectojoule?
Quectojoule (qJ) is a unit of energy.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of energy.
Is the quectojoule to kilocalorie conversion exact?
Yes. Both quectojoule and kilocalorie are defined by fixed standards rather than physical artifacts, so the factor of 2.390057e-34 used above is exact to as many digits as you choose to display.