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

kcal → BTU Reference Table

kcal	BTU
0.001 kcal	0.003965666831 BTU
0.002 kcal	0.007931333663 BTU
0.003 kcal	0.01189700049 BTU
0.004 kcal	0.01586266733 BTU
0.005 kcal	0.01982833416 BTU
0.006 kcal	0.02379400099 BTU
0.007 kcal	0.02775966782 BTU
0.008 kcal	0.03172533465 BTU
0.009 kcal	0.03569100148 BTU
0.01 kcal	0.03965666831 BTU
0.02 kcal	0.07931333663 BTU
0.03 kcal	0.1189700049 BTU
0.04 kcal	0.1586266733 BTU
0.05 kcal	0.1982833416 BTU
0.06 kcal	0.2379400099 BTU
0.07 kcal	0.2775966782 BTU
0.08 kcal	0.3172533465 BTU
0.09 kcal	0.3569100148 BTU
0.1 kcal	0.3965666831 BTU
0.2 kcal	0.7931333663 BTU
0.3 kcal	1.189700049 BTU
0.4 kcal	1.586266733 BTU
0.5 kcal	1.982833416 BTU
0.6 kcal	2.379400099 BTU
0.7 kcal	2.775966782 BTU
0.8 kcal	3.172533465 BTU
0.9 kcal	3.569100148 BTU
1 kcal	3.965666831 BTU
1.5 kcal	5.948500247 BTU
2 kcal	7.931333663 BTU
2.5 kcal	9.914167078 BTU
3 kcal	11.89700049 BTU
3.5 kcal	13.87983391 BTU
4 kcal	15.86266733 BTU
4.5 kcal	17.84550074 BTU
5 kcal	19.82833416 BTU
5.5 kcal	21.81116757 BTU
6 kcal	23.79400099 BTU
6.5 kcal	25.7768344 BTU
7 kcal	27.75966782 BTU
7.5 kcal	29.74250124 BTU
8 kcal	31.72533465 BTU
8.5 kcal	33.70816807 BTU
9 kcal	35.69100148 BTU
9.5 kcal	37.6738349 BTU
10 kcal	39.65666831 BTU
11 kcal	43.62233515 BTU
12 kcal	47.58800198 BTU
13 kcal	51.55366881 BTU
14 kcal	55.51933564 BTU
15 kcal	59.48500247 BTU
16 kcal	63.4506693 BTU
17 kcal	67.41633613 BTU
18 kcal	71.38200297 BTU
19 kcal	75.3476698 BTU
20 kcal	79.31333663 BTU
25 kcal	99.14167078 BTU
30 kcal	118.9700049 BTU
35 kcal	138.7983391 BTU
40 kcal	158.6266733 BTU
45 kcal	178.4550074 BTU
50 kcal	198.2833416 BTU
55 kcal	218.1116757 BTU
60 kcal	237.9400099 BTU
65 kcal	257.768344 BTU
70 kcal	277.5966782 BTU
75 kcal	297.4250124 BTU
80 kcal	317.2533465 BTU
85 kcal	337.0816807 BTU
90 kcal	356.9100148 BTU
95 kcal	376.738349 BTU
100 kcal	396.5666831 BTU
120 kcal	475.8800198 BTU
125 kcal	495.7083539 BTU
130 kcal	515.5366881 BTU
140 kcal	555.1933564 BTU
150 kcal	594.8500247 BTU
160 kcal	634.506693 BTU
175 kcal	693.9916955 BTU
180 kcal	713.8200297 BTU
200 kcal	793.1333663 BTU
225 kcal	892.2750371 BTU
250 kcal	991.4167078 BTU
275 kcal	1090.558379 BTU
300 kcal	1189.700049 BTU
350 kcal	1387.983391 BTU
400 kcal	1586.266733 BTU
450 kcal	1784.550074 BTU
500 kcal	1982.833416 BTU
600 kcal	2379.400099 BTU
700 kcal	2775.966782 BTU
750 kcal	2974.250124 BTU
800 kcal	3172.533465 BTU
900 kcal	3569.100148 BTU
1000 kcal	3965.666831 BTU
1200 kcal	4758.800198 BTU
1250 kcal	4957.083539 BTU
1500 kcal	5948.500247 BTU
1750 kcal	6939.916955 BTU
2000 kcal	7931.333663 BTU
2500 kcal	9914.167078 BTU
3000 kcal	11897.00049 BTU
4000 kcal	15862.66733 BTU
4500 kcal	17845.50074 BTU
5000 kcal	19828.33416 BTU
6000 kcal	23794.00099 BTU
7000 kcal	27759.66782 BTU
7500 kcal	29742.50124 BTU
8000 kcal	31725.33465 BTU
9000 kcal	35691.00148 BTU
10000 kcal	39656.66831 BTU
15000 kcal	59485.00247 BTU
20000 kcal	79313.33663 BTU
25000 kcal	99141.67078 BTU
50000 kcal	198283.3416 BTU
75000 kcal	297425.0124 BTU
100000 kcal	396566.6831 BTU

Values based on NIST SP 811 conversion factors

Why Convert Kilocalories to BTUs?

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

Energy conversions from kcal 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 Kilocalories to BTUs

To convert kilocalories to btus, use the following formula:

BTU = kcal × 3.965666831

Example: 1 kcal = 3.965666831 BTU

For example, 5 kcal = 19.82833416 BTU, 10 kcal = 39.65666831 BTU, and 100 kcal = 396.5666831 BTU. For larger values, 1000 kcal = 3965.666831 BTU. Conversely, 1 BTU = 0.2521644007 kcal. 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 Kilocalorie?

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

Widely used for measuring food energy content.

What is a BTU?

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

Standard in the US for HVAC systems.

Frequently Asked Questions

How many btus are in 1 kilocalorie?

1 kcal equals 3.965666831 BTU. This is an exact conversion factor defined by NIST.

How do I convert kilocalories to btus?

Multiply the value in kcal by the conversion factor. For example, 10 kcal = 39.65666831 BTU. Use our calculator above for instant results.

Is the kilocalories to btus conversion exact?

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

Can I convert kilocalories 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 kilocalories and btus?

Kilocalories (kcal) and BTUs (BTU) are both units of energy but belong to different measurement systems. 1 kcal = 3.965666831 BTU. Use the converter above to switch between them instantly.

Kilocalories → BTUs