How many kcal is 1 eV?

1 eV = 3.829×10⁻²³ kcal. A tiny fraction of a dietary Calorie.

A molecular bond is 5 eV — how many kcal?

5 × 3.829×10⁻²³ = 1.91×10⁻²² kcal. About 10⁻¹⁹ calories — negligible.

Why multiply by 3.83×10⁻²³?

eV is tiny compared to kcal. 1 eV = 1.6×10⁻¹⁹ J = 1.6×10⁻¹⁹/4184 kcal = 3.83×10⁻²³ kcal.

Is the conversion exact?

1 eV = 1.602176634×10⁻¹⁹ J ÷ 4184 J/kcal = 3.8293×10⁻²³ kcal exactly.

Electronvolts (eV) to Kilocalories (kcal) Converter

Enter a value to instantly convert between energy units.

From

Precision4 dp

1 Electronvolt = 3.8293e-23 Kilocalorie

Key Formulas

Kilocalorie → Kilojoule

kJ = kcal × 4.184

Kilojoule → Kilocalorie

kcal = kJ × 0.239006

Kilowatt-Hour → Joule

J = kWh × 3600000

Joule → Kilowatt-Hour

kWh = J × 2.77778e-7

Formula

kcal = eV × 3.8293e-23

One electronvolt equals about 3.829×10⁻²³ kilocalories. This conversion connects atomic-scale energy (eV) to dietary energy (kcal) — useful in quantum biology and biochemistry where molecular energies are discussed in eV but compared to metabolic energy.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

A biochemist calculating that 10²² eV (ATP energy scale) equals 0.383 kcal/mol.

1e+22 eV = 0.3829 kcal

A researcher analyzing 10²¹ eV of molecular energy as 0.0383 kcal for the paper.

1e+21 eV = 0.03829 kcal

A student verifying that 6.242×10²¹ eV (1 kcal equivalent) equals 0.239 kcal for the homework.

6.242e+21 eV = 0.239 kcal

A physicist noting that 10²⁰ eV is 0.00383 kcal — atomic scale to food scale.

100000000000000000000 eV = 0.003829 kcal

kcal to kj kj to kcal kwh to joules joules to kwh btu to joules calories to joules

Electronvolts (eV) to Kilocalories (kcal) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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