Calorie (th) to Megaton of TNT Converter

Energy Converter

27 units available

Decimals:

From

To

1.000000e-15

1 cal = 1.000000e-15 MtTNT

Formula:

MtTNT = cal × 1.000000e-15

With your value: 1 cal = 1.000000e-15 MtTNT

How big is that?

Everyday references on a logarithmic scale, all expressed in calorie (th) so you can sanity-check the result.

Heartbeat (1/4.2 your value)0.239 cal

Your value1.00 cal

AA battery charge (2.4e+3× your value)2.39e+3 cal

Slice of bread (6.7e+4× your value)6.69e+4 cal

Daily food intake (2.0e+6× your value)2.01e+6 cal

Litre of petrol (8.2e+6× your value)8.17e+6 cal

Other Calorie (th) to Megaton of TNT conversions

2 cal to MtTNT 3 cal to MtTNT 4 cal to MtTNT 5 cal to MtTNT 6 cal to MtTNT 7 cal to MtTNT 8 cal to MtTNT

Calorie (th) to Megaton of TNT Conversion Table

Calorie (th) (cal)	Megaton of TNT (MtTNT)
0.5	5.000000e-16
1	1.000000e-15
2	2.000000e-15
5	5.000000e-15
10	1.000000e-14
15	1.500000e-14
20	2.000000e-14
25	2.500000e-14
50	5.000000e-14
100	1.000000e-13
250	2.500000e-13
500	5.000000e-13
1000	1.000000e-12

Megaton of TNT to Calorie (th) Conversion Table

Megaton of TNT (MtTNT)	Calorie (th) (cal)
0.5	5.000000e+14
1	1.000000e+15
2	2.000000e+15
5	5.000000e+15
10	1.000000e+16
15	1.500000e+16
20	2.000000e+16
25	2.500000e+16
50	5.000000e+16
100	1.000000e+17
250	2.500000e+17
500	5.000000e+17
1000	1.000000e+18

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Calorie (th) (cal)

Energy

Exact conversion

The thermochemical calorie is exactly 4.184 J.

The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Megaton of TNT (MtTNT)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Calorie (th) to Megaton of TNT

To convert from Calorie (th) (cal) to Megaton of TNT (MtTNT), multiply the value by 1.000000e-15.

Formula: MtTNT = cal × 1.000000e-15

Reverse: cal = MtTNT × 1.000000e+15

Step-by-Step Example

Start with your value in Calorie (th). For example: 5 cal
Multiply by the conversion factor: 5 x 1.000000e-15
The result is: 5.000000e-15 MtTNT

About Calorie (th)

The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.

Common uses: chemistry, nutrition, heating.

About Megaton of TNT

The megaton of tnt (MtTNT) is a unit of energy and work. One megaton of tnt equals 4.184000 × 10^+15 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Megaton of TNT are in 1 Calorie (th)?

There are exactly 1.000000e-15 Megaton of TNT in 1 Calorie (th). This means the conversion factor from Calorie (th) to Megaton of TNT is 1.000000e-15.

What is the formula to convert Calorie (th) to Megaton of TNT?

The formula to convert Calorie (th) to Megaton of TNT is: MtTNT = cal × 1.000000e-15. For example, to convert 10 Calorie (th) to Megaton of TNT, you would multiply 10 by 1.000000e-15.

What is a Calorie (th)?