calorie (International Table)
Energyexact by definition
The International Table calorie is exactly 4.1868 joules, defined in 1956 by fixing the IT calorie against the IT kilowatt-hour rather than against any measurement of water. It is the calorie used in steam tables, refrigeration and most of European heating practice.
Watch out: This site's plain "calorie" is the thermochemical calorie of exactly 4.184 J, the one chemistry and nutrition use. The two differ by 0.07 percent, which is nothing in a diet and is enough to matter in a heat balance carried to four figures. A third value, the 15 °C calorie of about 4.1855 J, appears in older physics texts. If a document does not say which calorie it means, the field usually decides: thermochemical for chemistry and food, IT for steam and HVAC.
| 1 | 4.1868 |
One calorie (international table) in every energy unit
| 2.61320e+19 | electron volt (eV) | |
| 9.60331e+17 | hartree (Eh) | |
| 2.61320e+16 | kiloelectron volt (keV) | |
| 26,132,000,000,000 | megaelectron volt (MeV) | |
| 26,132,000,000 | gigaelectron volt (GeV) | |
| 4,186,800,000 | nanojoule (nJ) | |
| 41,868,000 | erg (erg) | |
| 26,132,000 | teraelectron volt (TeV) | |
| 4,186,800 | microjoule (µJ) | |
| 4,186.8 | millijoule (mJ) | |
| 37.0563 | inch-pound (in·lb) | |
| 4.1868 | joule (J) | |
| 3.08803 | foot-pound (ft⋅lb) | |
| 1.00067 | calorie (cal) | |
| 1 | calorie (International Table) (cal IT)this unit | |
| 0.0041868 | kilojoule (kJ) | |
| 0.00397098 | BTU (thermochemical) (BTU th) | |
| 0.00396832 | British thermal unit (BTU) | |
| 0.001163 | watt-hour (Wh) | |
| 0.00100067 | kilocalorie (kcal) | |
| 0.0000041868 | megajoule (MJ) | |
| 0.00000155961 | horsepower-hour (hp·h) | |
| 0.000001163 | kilowatt-hour (kWh) | |
| 3.96832e-08 | therm (therm) | |
| 4.18680e-09 | gigajoule (GJ) | |
| 3.96832e-09 | million BTU (MMBTU) | |
| 1.16300e-09 | megawatt-hour (MWh) | |
| 1.00067e-09 | ton of TNT (t TNT) | |
| 1.00000e-10 | tonne of oil equivalent (toe) | |
| 4.18680e-12 | terajoule (TJ) | |
| 1.16300e-12 | gigawatt-hour (GWh) | |
| 1.00067e-12 | kiloton of TNT (kt TNT) | |
| 4.18680e-15 | petajoule (PJ) | |
| 1.16300e-15 | terawatt-hour (TWh) | |
| 1.00067e-15 | megaton of TNT (Mt TNT) | |
| 3.96832e-18 | quad (quad) |