How many btus are in 1 kilojoule?

1 kJ equals 0.9478171203 BTU. This is an exact conversion factor defined by NIST.

How do I convert kilojoules to btus?

Multiply the value in kJ by the conversion factor. For example, 10 kJ = 9.478171203 BTU. Use our calculator above for instant results.

Is the kilojoules to btus conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert kilojoules to btus offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between kilojoules and btus?

Kilojoules (kJ) and BTUs (BTU) are both units of energy but belong to different measurement systems. 1 kJ = 0.9478171203 BTU. Use the converter above to switch between them instantly.

Kilojoules to BTUs (kJ → BTU) — Free Online Converter

kJ → BTU Reference Table

kJ	BTU
0.001 kJ	0.0009478171203 BTU
0.002 kJ	0.001895634241 BTU
0.003 kJ	0.002843451361 BTU
0.004 kJ	0.003791268481 BTU
0.005 kJ	0.004739085602 BTU
0.006 kJ	0.005686902722 BTU
0.007 kJ	0.006634719842 BTU
0.008 kJ	0.007582536963 BTU
0.009 kJ	0.008530354083 BTU
0.01 kJ	0.009478171203 BTU
0.02 kJ	0.01895634241 BTU
0.03 kJ	0.02843451361 BTU
0.04 kJ	0.03791268481 BTU
0.05 kJ	0.04739085602 BTU
0.06 kJ	0.05686902722 BTU
0.07 kJ	0.06634719842 BTU
0.08 kJ	0.07582536963 BTU
0.09 kJ	0.08530354083 BTU
0.1 kJ	0.09478171203 BTU
0.2 kJ	0.1895634241 BTU
0.3 kJ	0.2843451361 BTU
0.4 kJ	0.3791268481 BTU
0.5 kJ	0.4739085602 BTU
0.6 kJ	0.5686902722 BTU
0.7 kJ	0.6634719842 BTU
0.8 kJ	0.7582536963 BTU
0.9 kJ	0.8530354083 BTU
1 kJ	0.9478171203 BTU
1.5 kJ	1.42172568 BTU
2 kJ	1.895634241 BTU
2.5 kJ	2.369542801 BTU
3 kJ	2.843451361 BTU
3.5 kJ	3.317359921 BTU
4 kJ	3.791268481 BTU
4.5 kJ	4.265177041 BTU
5 kJ	4.739085602 BTU
5.5 kJ	5.212994162 BTU
6 kJ	5.686902722 BTU
6.5 kJ	6.160811282 BTU
7 kJ	6.634719842 BTU
7.5 kJ	7.108628402 BTU
8 kJ	7.582536963 BTU
8.5 kJ	8.056445523 BTU
9 kJ	8.530354083 BTU
9.5 kJ	9.004262643 BTU
10 kJ	9.478171203 BTU
11 kJ	10.42598832 BTU
12 kJ	11.37380544 BTU
13 kJ	12.32162256 BTU
14 kJ	13.26943968 BTU
15 kJ	14.2172568 BTU
16 kJ	15.16507393 BTU
17 kJ	16.11289105 BTU
18 kJ	17.06070817 BTU
19 kJ	18.00852529 BTU
20 kJ	18.95634241 BTU
25 kJ	23.69542801 BTU
30 kJ	28.43451361 BTU
35 kJ	33.17359921 BTU
40 kJ	37.91268481 BTU
45 kJ	42.65177041 BTU
50 kJ	47.39085602 BTU
55 kJ	52.12994162 BTU
60 kJ	56.86902722 BTU
65 kJ	61.60811282 BTU
70 kJ	66.34719842 BTU
75 kJ	71.08628402 BTU
80 kJ	75.82536963 BTU
85 kJ	80.56445523 BTU
90 kJ	85.30354083 BTU
95 kJ	90.04262643 BTU
100 kJ	94.78171203 BTU
120 kJ	113.7380544 BTU
125 kJ	118.47714 BTU
130 kJ	123.2162256 BTU
140 kJ	132.6943968 BTU
150 kJ	142.172568 BTU
160 kJ	151.6507393 BTU
175 kJ	165.8679961 BTU
180 kJ	170.6070817 BTU
200 kJ	189.5634241 BTU
225 kJ	213.2588521 BTU
250 kJ	236.9542801 BTU
275 kJ	260.6497081 BTU
300 kJ	284.3451361 BTU
350 kJ	331.7359921 BTU
400 kJ	379.1268481 BTU
450 kJ	426.5177041 BTU
500 kJ	473.9085602 BTU
600 kJ	568.6902722 BTU
700 kJ	663.4719842 BTU
750 kJ	710.8628402 BTU
800 kJ	758.2536963 BTU
900 kJ	853.0354083 BTU
1000 kJ	947.8171203 BTU
1200 kJ	1137.380544 BTU
1250 kJ	1184.7714 BTU
1500 kJ	1421.72568 BTU
1750 kJ	1658.679961 BTU
2000 kJ	1895.634241 BTU
2500 kJ	2369.542801 BTU
3000 kJ	2843.451361 BTU
4000 kJ	3791.268481 BTU
4500 kJ	4265.177041 BTU
5000 kJ	4739.085602 BTU
6000 kJ	5686.902722 BTU
7000 kJ	6634.719842 BTU
7500 kJ	7108.628402 BTU
8000 kJ	7582.536963 BTU
9000 kJ	8530.354083 BTU
10000 kJ	9478.171203 BTU
15000 kJ	14217.2568 BTU
20000 kJ	18956.34241 BTU
25000 kJ	23695.42801 BTU
50000 kJ	47390.85602 BTU
75000 kJ	71086.28402 BTU
100000 kJ	94781.71203 BTU

Values based on NIST SP 811 conversion factors

Why Convert Kilojoules to BTUs?

Converting between kilojoules (kJ) and btus (BTU) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert kJ to BTU saves time and prevents errors.

Energy conversions from kJ to BTU are crucial for dietitians, physicists, and engineers. In nutrition, understanding the link between calories and joules helps individuals manage their diet and energy intake effectively. In the power sector, converting between kilowatt-hours and British Thermal Units (BTU) is necessary for sizing heating and cooling systems for homes and offices. Physicists rely on precise energy unit conversions to calculate work, heat, and thermodynamic processes. Whether tracking fitness goals or analyzing home energy bills, accurate conversion empowers users to make better health and financial decisions.

How to Convert Kilojoules to BTUs

To convert kilojoules to btus, use the following formula:

BTU = kJ × 0.9478171203

Example: 1 kJ = 0.9478171203 BTU

For example, 5 kJ = 4.739085602 BTU, 10 kJ = 9.478171203 BTU, and 100 kJ = 94.78171203 BTU. For larger values, 1000 kJ = 947.8171203 BTU. Conversely, 1 BTU = 1.055055853 kJ. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Calorie confusion: Food 'Calories' are actually kilocalories (kcal).
Joule scale: 1 kWh is 3.6 million Joules (orders of magnitude difference).
Power vs Energy: mixing up Watts (power) and Watt-hours (energy).

Pro Tips

Food labels: Learn to read kcal; average adult needs ~2000 kcal/day.
Battery capacity: Wh = V * Ah. Useful for comparing different voltage batteries.
Efficiency: Energy cannot be created/destroyed, only converted (with some loss as heat).

What is a Kilojoule?

A unit of energy equal to 1,000 Joules.

Standard unit for food energy labeling in most of the world.

What is a BTU?

British Thermal Unit. Heat to raise 1 lb of water by 1°F.

Standard in the US for HVAC systems.

Kilojoules → BTUs

Kilojoules to BTUs Formula