How many calories are in 1 kcal?

Exactly 1,000 small calories when both use the same calorie definition. Here both are thermochemical: 0.25 kcal is 250 cal, 7 kcal is 7,000 cal, 100 kcal is 100,000 cal, 1,500 kcal is 1,500,000 cal and 3,500 kcal is 3,500,000 cal. In reverse, 500 cal is 0.5 kcal, 250,000 cal is 250 kcal and 2,000,000 cal is 2,000 kcal. A food Calorie commonly means a kilocalorie; its numerical count matches kcal only under the same stated convention.

Which calorie does this page convert to, the small one or the food Calorie?

The small thermochemical calorie, exactly 4.184 J; the Kilocalorie (kcal) is exactly 4,184 J. The headline therefore converts 1 kcal to 1,000 cal. A food Calorie commonly means a kilocalorie, but the converter cannot identify an external label’s convention. For a stated thermochemical quantity, 250 kcal is exactly 1,046 kJ and 1,046,000 J. Select the source’s explicit unit rather than treating its capitalization or context as proof.

What is the formula for kcal to calories?

cal = kcal × 1,000, and kcal = cal / 1,000 in the other direction. Both units sit on the same joule scale in this table, 4,184 J for the kilocalorie and 4.184 J for the calorie, so the factor of a thousand between them is the prefix and nothing more. The swap button between the two boxes reverses the pair, which turns this into a calories to kcal page without a reload: 500 cal reads 0.5 kcal and 2,000,000 cal reads 2,000 kcal.

Why do kcal and Calories look interchangeable on food packaging?

Food Calorie commonly names a kilocalorie. If a source explicitly uses that same thermochemical convention, 250 Calories and 250 kcal describe one quantity. Its conversions here are exactly 1,046 kJ and 250,000 cal; likewise 500 kcal is 2,092 kJ and 500,000 cal, and 2,000 kcal is 8,368 kJ and 2,000,000 cal. A converter does not certify a packaging label, its rounding or its method for calculating food energy.

Is a calorie 4.184 joules or 4.1868 joules?

This table uses the thermochemical calorie of exactly 4.184 J and its kilocalorie of exactly 4,184 J. The International Table calorie is exactly 4.1868 J and its kilocalorie exactly 4,186.8 J, about 0.07% larger. Other historical definitions exist. The factor 1,000 between a calorie and its own kilocalorie stays exact when they share the same definition; mixing definitions changes the conversion. IT and temperature-specific calories are absent from the menus here.

How many joules and watt hours is 1 kcal?

4,184 J, 4.184 kJ, 1.16222222222 Wh, 0.00116222222222 kWh and 3.96566683139 IT BTU, all of them listed under the answer as soon as you type. For a 2,000 kcal figure the same rows read 8,368,000 J, 8,368 kJ, 2,324.44444444 Wh, 2.32444444444 kWh and 7,931.33366278 IT BTU. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Does the list under the answer repeat kilocalories?

No. The list shows the other common units in the energy category and skips the one in the From box, so here it reads joule, kilojoule, calorie, watt hour, kilowatt hour and IT British thermal unit. The readout strip also carries an Uncommon units switch labelled Show 1 more, which adds the electronvolt: 1 kcal is 2.61144739675e22 eV. Results print to twelve significant digits, and a displayed magnitude at or above 1e15, or below 0.000001, is shown in exponential notation, which is why that one arrives with an exponent.

Why does the page open on kcal and cal when I last converted something else?

This focused page opens on Kilocalorie and Calorie, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

Kcal to Calories Converter

Different units and definitions share the calorie name, and which one you mean decides the answer. The small thermochemical calorie used here is exactly 4.184 joules, and that is the unit this page converts into: cal = kcal × 1,000, so 1 kcal is 1,000 cal, 7 kcal is 7,000 cal, 250 kcal is 250,000 cal and 2,000 kcal is 2,000,000 cal. A food Calorie commonly means a kilocalorie. When a source explicitly uses the thermochemical convention, 250 such Calories and 250 kcal name the same quantity; check the source’s unit definition rather than inferring it from capitalization alone. This page opens the converter with Kilocalorie (kcal) in the From box and Calorie (cal) in the To box, ahead of whatever pair you converted last, and the list under the answer carries the same energy in joules, kilojoules, watt hours, kilowatt hours and IT British thermal units, where 1 kcal is 4,184 J, 4.184 kJ, 1.16222222222 Wh, 0.00116222222222 kWh and 3.96566683139 BTU. The thousand between the two calories is an SI prefix rather than a measurement, so the factor 1,000 is exact when both units use the same calorie definition; this converter uses the thermochemical definition for both.

From

To1,000

Category: Energy

Base unit: joule

Uncommon units: Show 1 more

BTU uses the International Table definition (1,055.05585262 J); cal and kcal are thermochemical (4.184 J per cal). Wh and kWh are energy, not power in W or kW.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 kcal in every energy unit

JouleJ
4,184
KilojoulekJ
4.184
Caloriecal
1,000
Watt hourWh
1.16222222222
Kilowatt hourkWh
0.00116222222222
British thermal unitBTU
3.96566683139

Selectable complete conversion

Unit Converter — Energy
Input: 1 (Kilocalorie, kcal)
Result: 1000 cal (Calorie)
Displayed values round to 12 significant digits.
BTU uses the International Table definition (1,055.05585262 J); cal and kcal are thermochemical (4.184 J per cal). Wh and kWh are energy, not power in W or kW.
All other units:
Joule (J): 4184
Kilojoule (kJ): 4.184
Calorie (cal): 1000
Watt hour (Wh): 1.16222222222
Kilowatt hour (kWh): 0.00116222222222
British thermal unit (BTU): 3.96566683139
Electronvolt (eV): 2.61144739675e22

Common questions

How many calories are in 1 kcal?: Exactly 1,000 small calories when both use the same calorie definition. Here both are thermochemical: 0.25 kcal is 250 cal, 7 kcal is 7,000 cal, 100 kcal is 100,000 cal, 1,500 kcal is 1,500,000 cal and 3,500 kcal is 3,500,000 cal. In reverse, 500 cal is 0.5 kcal, 250,000 cal is 250 kcal and 2,000,000 cal is 2,000 kcal. A food Calorie commonly means a kilocalorie; its numerical count matches kcal only under the same stated convention.
Which calorie does this page convert to, the small one or the food Calorie?: The small thermochemical calorie, exactly 4.184 J; the Kilocalorie (kcal) is exactly 4,184 J. The headline therefore converts 1 kcal to 1,000 cal. A food Calorie commonly means a kilocalorie, but the converter cannot identify an external label’s convention. For a stated thermochemical quantity, 250 kcal is exactly 1,046 kJ and 1,046,000 J. Select the source’s explicit unit rather than treating its capitalization or context as proof.
What is the formula for kcal to calories?: cal = kcal × 1,000, and kcal = cal / 1,000 in the other direction. Both units sit on the same joule scale in this table, 4,184 J for the kilocalorie and 4.184 J for the calorie, so the factor of a thousand between them is the prefix and nothing more. The swap button between the two boxes reverses the pair, which turns this into a calories to kcal page without a reload: 500 cal reads 0.5 kcal and 2,000,000 cal reads 2,000 kcal.
Why do kcal and Calories look interchangeable on food packaging?: Food Calorie commonly names a kilocalorie. If a source explicitly uses that same thermochemical convention, 250 Calories and 250 kcal describe one quantity. Its conversions here are exactly 1,046 kJ and 250,000 cal; likewise 500 kcal is 2,092 kJ and 500,000 cal, and 2,000 kcal is 8,368 kJ and 2,000,000 cal. A converter does not certify a packaging label, its rounding or its method for calculating food energy.
Is a calorie 4.184 joules or 4.1868 joules?: This table uses the thermochemical calorie of exactly 4.184 J and its kilocalorie of exactly 4,184 J. The International Table calorie is exactly 4.1868 J and its kilocalorie exactly 4,186.8 J, about 0.07% larger. Other historical definitions exist. The factor 1,000 between a calorie and its own kilocalorie stays exact when they share the same definition; mixing definitions changes the conversion. IT and temperature-specific calories are absent from the menus here.
How many joules and watt hours is 1 kcal?: 4,184 J, 4.184 kJ, 1.16222222222 Wh, 0.00116222222222 kWh and 3.96566683139 IT BTU, all of them listed under the answer as soon as you type. For a 2,000 kcal figure the same rows read 8,368,000 J, 8,368 kJ, 2,324.44444444 Wh, 2.32444444444 kWh and 7,931.33366278 IT BTU. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.
Does the list under the answer repeat kilocalories?: No. The list shows the other common units in the energy category and skips the one in the From box, so here it reads joule, kilojoule, calorie, watt hour, kilowatt hour and IT British thermal unit. The readout strip also carries an Uncommon units switch labelled Show 1 more, which adds the electronvolt: 1 kcal is 2.61144739675e22 eV. Results print to twelve significant digits, and a displayed magnitude at or above 1e15, or below 0.000001, is shown in exponential notation, which is why that one arrives with an exponent.
Why does the page open on kcal and cal when I last converted something else?: This focused page opens on Kilocalorie and Calorie, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.