20 kilocalories to kilojoules
20 kilocalories equals 83.68 kilojoules. Conversion formula, quick reference table and FAQs for kcal to kJ.
Calculation：20 × 4.184 = 83.68
Convert kcal to kJ in three steps
- 1. Take the conversion factor: 1 kcal = 4.184 kJ.
- 2. Multiply your value by the factor: 20 × 4.184.
- 3. Read the result: 20 kcal = 83.68 kJ, then round to your needed precision.
Conversion formula: kcal to kJ
Reverse: 1 kJ = 0.239006 kcal · see kj-to-kcal
kcal → kJ quick reference
kcal to kJ: common values at a glance
- · 1 kcal = 4.184 kJ.
- · 2 kcal = 8.368 kJ.
- · 5 kcal = 20.92 kJ.
- · 10 kcal = 41.84 kJ.
- · 25 kcal = 104.6 kJ.
When do you need kcal → kJ?
Food labels in kJ, fitness in kcal, electricity in kWh, air conditioning in BTU — energy units link diet and bills. For example: a 330 ml cola has about 591 kJ ≈ 141 kcal; 1 kWh = 3,600 kJ; a 30-minute run burns roughly 300 kcal.
Where do kcal and kJ come from?
SI anchors to the joule. The kilocalorie = 4.184 kJ (from water-heating experiments); 1 kWh = 3.6 MJ is power × time; the BTU (1,055 J) persists in HVAC.
FAQs
▸How many kilojoules is 20 kilocalories?
20 kilocalories equals 83.68 kilojoules. Calculated as 20 × 4.184 = 83.68.
▸What is the formula to convert kilocalories to kilojoules?
1 kcal = 4.184 kJ, so kJ = kcal × 4.184
▸Is there a quick way to estimate kcal to kJ?
1 kcal = 4.184 kJ; 1 kWh = 3,600 kJ. Food-label "Calories" are actually kcal.
▸Where can I convert other values?
Open the full kilocalories converter and enter any value: the tool supports bidirectional conversion between kcal and kJ with all related units.
▸Why does the result contain decimals? How is rounding handled?
Because kcal and kJ belong to different unit systems, the ratio is rarely a round number — results are shown to 6 significant figures and rounded for readability. For engineering or medical use, keep at least 2 decimal places and verify with the tool above.
▸Where do the kcal and kJ definitions come from?
Both units trace back to international standard definitions — imperial units were fixed against metric by the 1959 international yard-and-pound agreement, and metric units are maintained by the BIPM. The factors used on this page match those standards.
▸How do I convert kJ back to kcal?
Use the inverse operation: for linear conversions divide by the factor instead of multiplying (or visit the reverse page); for temperature pairs, apply the inverse formula shown in the formula section.