How many cal is 1 million ergs?

1,000,000 × 2.39×10⁻⁸ = 0.0239 cal. A tiny amount.

Why multiply by 2.39×10⁻⁸?

1 erg = 10⁻⁷ J = 10⁻⁷/4.184 cal = 2.39×10⁻⁸ cal.

Is the conversion exact?

1 erg = 10⁻⁷ J ÷ 4.184 J/cal = 2.39006×10⁻⁸ cal exactly.

A star emits 10³³ ergs/s — how many cal/s?

10³³ × 2.39×10⁻⁸ = 2.39×10²⁵ cal/s. Solar luminosity in calories.

Ergs to Calories (cal) Converter

Enter a value to instantly convert between energy units.

From

Precision4 dp

1 Erg = 2.3901e-8 Calorie (thermochemical)

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

cal = erg × 2.3901e-8

One erg equals about 2.39×10⁻⁸ thermochemical calories. Since 1 erg = 10⁻⁷ J and 1 cal = 4.184 J, the conversion is 10⁻⁷/4.184 = 2.39×10⁻⁸ cal. This conversion is mainly used when converting historical scientific data to modern units.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

A student converting 41.84 million ergs to SI units gets 1 cal — textbook exercise.

41840000 erg = 1 cal

A physicist measuring 1 billion ergs from a cosmic ray hit records 0.0239 cal in the detector log.

1000000000 erg = 0.0239 cal

A researcher analyzing 1 million ergs of energy records 0.0000239 cal in the paper.

1000000 erg = 0.0000239 cal

A micro-engineering lab measuring 100 million ergs of adhesion energy reports 0.00239 cal.

100000000 erg = 0.00239 cal

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

Ergs to Calories (cal) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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