Use this free online calculator to convert Attojoule to Btu instantly. This energy conversion tool provides accurate results for all your measurement needs.

Quick Reference

1 Attojoule = 9.478e-22 Btu

1 Btu = 1.0550559e+21 Attojoule

Attojoule to Btu Conversion Formula

To convert Attojoule to Btu, multiply by 9.478e-22.

Btu = Attojoule × 9.478e-22

Attojoule = Btu × 1.0550559e+21

To convert Btu back to Attojoule, divide by 9.478e-22 (or multiply by 1.0550559e+21).

About These Units

About Attojoule

The attojoule is a unit of energy used to measure work, heat, or power in various scientific and engineering contexts.

About Btu

The Btu is a unit of heat energy defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. In America the British thermal unit is sometimes called the heat unit. In defining the Btu, it is necessary to specify the temperature of the water; thus there have been several definitions over the years. However, one Btu is equal to about 251.996 (small) calories, or 0.251 996 of the (kilo-)calories counted by dieters. Using the current definition of the calorie (the IT calorie), one Btu equals approximately 778.169 foot pounds, 1.055 056 kilojoules or 0.293 071 watt hour. The symbol BThU has also been used, especially in Britain.

Attojoule to Btu Conversion Table

Attojoule	Btu	Btu	Attojoule
0.1	9.478e-23	0.1	105505590000000008192.00
0.5	4.739e-22	0.5	527527950000000008192.00
1	9.478e-22	1	1.0550559e+21
2	1.896e-21	2	2.1101118e+21
5	4.739e-21	5	5.2752795e+21
10	9.478e-21	10	1.0550559e+22
20	1.896e-20	20	2.1101118e+22
25	2.370e-20	25	2.6376397500000003e+22
50	4.739e-20	50	5.2752795000000005e+22
100	9.478e-20	100	1.0550559000000001e+23
250	2.370e-19	250	2.63763975e+23
500	4.739e-19	500	5.2752795e+23
1000	9.478e-19	1000	1.0550559e+24

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