BTUs to Kilocalories (BTU → kcal) — Free Online Converter

BTU → kcal Reference Table

BTU	kcal
0.001 BTU	0.0002521644007 kcal
0.002 BTU	0.0005043288014 kcal
0.003 BTU	0.0007564932022 kcal
0.004 BTU	0.001008657603 kcal
0.005 BTU	0.001260822004 kcal
0.006 BTU	0.001512986404 kcal
0.007 BTU	0.001765150805 kcal
0.008 BTU	0.002017315206 kcal
0.009 BTU	0.002269479606 kcal
0.01 BTU	0.002521644007 kcal
0.02 BTU	0.005043288014 kcal
0.03 BTU	0.007564932022 kcal
0.04 BTU	0.01008657603 kcal
0.05 BTU	0.01260822004 kcal
0.06 BTU	0.01512986404 kcal
0.07 BTU	0.01765150805 kcal
0.08 BTU	0.02017315206 kcal
0.09 BTU	0.02269479606 kcal
0.1 BTU	0.02521644007 kcal
0.2 BTU	0.05043288014 kcal
0.3 BTU	0.07564932022 kcal
0.4 BTU	0.1008657603 kcal
0.5 BTU	0.1260822004 kcal
0.6 BTU	0.1512986404 kcal
0.7 BTU	0.1765150805 kcal
0.8 BTU	0.2017315206 kcal
0.9 BTU	0.2269479606 kcal
1 BTU	0.2521644007 kcal
1.5 BTU	0.3782466011 kcal
2 BTU	0.5043288014 kcal
2.5 BTU	0.6304110018 kcal
3 BTU	0.7564932022 kcal
3.5 BTU	0.8825754025 kcal
4 BTU	1.008657603 kcal
4.5 BTU	1.134739803 kcal
5 BTU	1.260822004 kcal
5.5 BTU	1.386904204 kcal
6 BTU	1.512986404 kcal
6.5 BTU	1.639068605 kcal
7 BTU	1.765150805 kcal
7.5 BTU	1.891233005 kcal
8 BTU	2.017315206 kcal
8.5 BTU	2.143397406 kcal
9 BTU	2.269479606 kcal
9.5 BTU	2.395561807 kcal
10 BTU	2.521644007 kcal
11 BTU	2.773808408 kcal
12 BTU	3.025972809 kcal
13 BTU	3.278137209 kcal
14 BTU	3.53030161 kcal
15 BTU	3.782466011 kcal
16 BTU	4.034630412 kcal
17 BTU	4.286794812 kcal
18 BTU	4.538959213 kcal
19 BTU	4.791123614 kcal
20 BTU	5.043288014 kcal
25 BTU	6.304110018 kcal
30 BTU	7.564932022 kcal
35 BTU	8.825754025 kcal
40 BTU	10.08657603 kcal
45 BTU	11.34739803 kcal
50 BTU	12.60822004 kcal
55 BTU	13.86904204 kcal
60 BTU	15.12986404 kcal
65 BTU	16.39068605 kcal
70 BTU	17.65150805 kcal
75 BTU	18.91233005 kcal
80 BTU	20.17315206 kcal
85 BTU	21.43397406 kcal
90 BTU	22.69479606 kcal
95 BTU	23.95561807 kcal
100 BTU	25.21644007 kcal
120 BTU	30.25972809 kcal
125 BTU	31.52055009 kcal
130 BTU	32.78137209 kcal
140 BTU	35.3030161 kcal
150 BTU	37.82466011 kcal
160 BTU	40.34630412 kcal
175 BTU	44.12877013 kcal
180 BTU	45.38959213 kcal
200 BTU	50.43288014 kcal
225 BTU	56.73699016 kcal
250 BTU	63.04110018 kcal
275 BTU	69.3452102 kcal
300 BTU	75.64932022 kcal
350 BTU	88.25754025 kcal
400 BTU	100.8657603 kcal
450 BTU	113.4739803 kcal
500 BTU	126.0822004 kcal
600 BTU	151.2986404 kcal
700 BTU	176.5150805 kcal
750 BTU	189.1233005 kcal
800 BTU	201.7315206 kcal
900 BTU	226.9479606 kcal
1000 BTU	252.1644007 kcal
1200 BTU	302.5972809 kcal
1250 BTU	315.2055009 kcal
1500 BTU	378.2466011 kcal
1750 BTU	441.2877013 kcal
2000 BTU	504.3288014 kcal
2500 BTU	630.4110018 kcal
3000 BTU	756.4932022 kcal
4000 BTU	1008.657603 kcal
4500 BTU	1134.739803 kcal
5000 BTU	1260.822004 kcal
6000 BTU	1512.986404 kcal
7000 BTU	1765.150805 kcal
7500 BTU	1891.233005 kcal
8000 BTU	2017.315206 kcal
9000 BTU	2269.479606 kcal
10000 BTU	2521.644007 kcal
15000 BTU	3782.466011 kcal
20000 BTU	5043.288014 kcal
25000 BTU	6304.110018 kcal
50000 BTU	12608.22004 kcal
75000 BTU	18912.33005 kcal
100000 BTU	25216.44007 kcal

Values based on NIST SP 811 conversion factors

Why Convert BTUs to Kilocalories?

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

Energy conversions from BTU to kcal 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 BTUs to Kilocalories

To convert btus to kilocalories, use the following formula:

kcal = BTU × 0.2521644007

Example: 1 BTU = 0.2521644007 kcal

For example, 5 BTU = 1.260822004 kcal, 10 BTU = 2.521644007 kcal, and 100 BTU = 25.21644007 kcal. For larger values, 1000 BTU = 252.1644007 kcal. Conversely, 1 kcal = 3.965666831 BTU. 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 BTU?

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

Standard in the US for HVAC systems.

What is a Kilocalorie?

A unit of energy equal to 1,000 calories ("Calorie").

Widely used for measuring food energy content.

Frequently Asked Questions

How many kilocalories are in 1 btu?

1 BTU equals 0.2521644007 kcal. This is an exact conversion factor defined by NIST.

How do I convert btus to kilocalories?

Multiply the value in BTU by the conversion factor. For example, 10 BTU = 2.521644007 kcal. Use our calculator above for instant results.

Is the btus to kilocalories conversion exact?

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

Can I convert btus to kilocalories 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 btus and kilocalories?

BTUs (BTU) and Kilocalories (kcal) are both units of energy but belong to different measurement systems. 1 BTU = 0.2521644007 kcal. Use the converter above to switch between them instantly.

BTUs → Kilocalories