kW to BTU/h: 1 kW = 3,412.141633 BTU/h

The formula

BTU/h = kW × 3,412.141633

Where the factor comes from — each unit by its definition, then its size in SI:

1 kW = 1000 × W = 1,000 W
1 BTU/h = BTU / h = 0.293071070172 W

Dividing the two SI sizes gives the factor: 3,412.14163313 (rounded for display; the underlying ratio is fixed by the definitions). The reverse factor is 0.000293071070172.

Power is energy per second; the watt is one joule per second. Engine ratings in horsepower and air-conditioner ratings in BTU/h convert to watts with fixed factors.

Worked examples

A small car engine (100 hp): 74.57 kW = 254,443 BTU/h — 74.57 × 3,412.141633 = 254,443
An old incandescent bulb (60 W): 0.06 kW = 204.728 BTU/h — 0.06 × 3,412.141633 = 204.728
An electric kettle: 2 kW = 6,824.28 BTU/h — 2 × 3,412.141633 = 6,824.28
A room air conditioner: 3.51685 kW = 12,000 BTU/h — 3.51685 × 3,412.141633 = 12,000

Frequently asked questions

How many BTU per hour is 1 kW?

1 kW = 3,412.14163313 BTU/h.

How do I convert BTU per hour back to kilowatts?

Divide by 3,412.14163313 — or multiply by 0.000293071070172: 1 BTU/h = 0.000293071070172 kW.

kW to BTU/h conversion table

Kilowatts (kW)	BTU per hour (BTU/h)
1	3,412.1416
2	6,824.2833
3	10,236.425
4	13,648.567
5	17,060.708
6	20,472.85
7	23,884.991
8	27,297.133
9	30,709.275
10	34,121.416
15	51,182.124
20	68,242.833
25	85,303.541
30	102,364.25
40	136,485.67
50	170,607.08
60	204,728.5
70	238,849.91
75	255,910.62
80	272,971.33
90	307,092.75
100	341,214.16
150	511,821.24
200	682,428.33
250	853,035.41
500	1,706,070.8
1,000	3,412,141.6

Definitions: BIPM, The International System of Units (SI Brochure), 9th edition (2019), Tables 2, 4 and 8 — https://www.bipm.org/en/publications/si-brochure · International Table British thermal unit, 1 Btu_IT = 1055.05585262 J (Fifth International Conference on the Properties of Steam, 1956; NIST SP 811 B.8). Machine value of the factor: 3412.14163313.