Food kilocalorie
A food kilocalorie is the energy needed to raise the temperature of one kilogram of water by one degree Celsius, used to express food energy.
How big is it?
4.184 kJ · energy
Energy · defined energy model
A little perspective
Food kilocalorie vs Coin cell stored energy: energy comparison
The energy of a food kilocalorie is about 1.72 times the energy stored in a coin cell.
ENERGY STORED OR TRANSFERRED
A food kilocalorie is the energy needed to raise the temperature of one kilogram of water by one degree Celsius, used to express food energy.
Coin cell stored energy is the total electrical energy that can be delivered by a small, disc-shaped lithium battery before depletion.
Measurements, assumptions & sources +
Food kilocalorie
Energy: 4.184 kJ; defined energy model.
One thermochemical kilocalorie, the unit commonly written Calorie on food labels.
Defined examples — our methodology
The marked energy is calibrated. Unmeasured illustration details are representative.
Coin cell stored energy
Defined nominal stored energy: 2.43 kJ; derived specification; range 2.2 kJ–2.6 kJ.
A defined CR2032 lithium coin cell rated at 3 V and 225 mAh stores a nominal 2,430 J by voltage × ampere-hours × 3,600. Delivered energy depends on load, cutoff voltage, temperature and ageing.
Energizer — CR2032 product datasheet
The marked defined nominal stored energy is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 4.184 kJ
We compare the energy of a food kilocalorie. This is an illustrative comparison value, not a claim that every example is the same.
One thermochemical kilocalorie, the unit commonly written Calorie on food labels.
The picture identifies the subject; the diagram compares the recorded values. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 4.184 kJ | Not recorded | defined energy model |
Around this scale
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Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEnergyCoin cell stored energy2.43 kJDefined nominal stored energyCoin cell stored energy is the total electrical energy that can be delivered by a small, disc-shaped lithium battery before depletion.
Nearest higher valueEnergyPhone battery54 kJEnergyA phone battery stores electrical energy to power a mobile phone.Sources and method
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Curated comparisons
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EnergyPhone battery54 kJA phone battery stores electrical energy to power a mobile phone.
EnergyElectric car battery216 MJAn electric car battery stores energy to power an electric vehicle.
EnergyOne second of sunlight3.828 × 10¹¹ PJThe total energy emitted by the Sun in all directions over one second.EnergyCoin cell stored energy2.43 kJCoin cell stored energy is the total electrical energy that can be delivered by a small, disc-shaped lithium battery before depletion.
EnergyLaptop battery216 kJA laptop battery supplies electrical energy to a portable computer.
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