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

Quick Reference

1 Btu = 0.293071 Watthour

1 Watthour = 3.4121 Btu

Btu to Watthour Conversion Formula

To convert Btu to Watthour, multiply by 0.293071.

Watthour = Btu × 0.293071

Btu = Watthour × 3.4121

To convert Watthour back to Btu, divide by 0.293071 (or multiply by 3.4121).

About These Units

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.

About Watthour

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

Btu to Watthour Conversion Table

Btu	Watthour	Watthour	Btu
0.1	0.029307	0.1	0.341214
0.5	0.146536	0.5	1.7061
1	0.293071	1	3.4121
2	0.586142	2	6.8243
5	1.4654	5	17.0607
10	2.9307	10	34.1214
20	5.8614	20	68.2428
25	7.3268	25	85.3035
50	14.6536	50	170.6071
100	29.3071	100	341.2141
250	73.2678	250	853.0354
500	146.5355	500	1706.07
1000	293.0711	1000	3412.14

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