OmniConvert
Energy • NIST Exact

Kilocalories → BTUs

kcal → BTU

Enter any value for instant conversion. Click on the result to copy with unit.

Reverse Conversion

NIST Exact

Based on U.S. National Institute of Standards

Privacy First

All calculations run in your browser

Instant Results

Real-time conversion as you type

Works Offline

No internet connection required

Kilocalories to BTUs Formula

To convert from Kilocalories to BTUs, you can use the following formula:

BTUs = Kilocalories × NaN

This means you need to multiply your Kilocalories value by NaN to get the equivalent value in BTUs.

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

Energy More Conversions

kJ → kcalkcal → kJJ → calcal → JkWh → JBTU → J

Ready to convert? Try our free calculator now.

Start Converting

Need File Conversion?

Convert images and documents between formats — JPG, PNG, WebP, PDF, and more. 100% client-side, your files never leave your browser.

Try File Converter →