How much is 100 kcal?

100 kcal is equal to 100 kilocalories. A kilocalorie, commonly referred to as a Calorie (with a capital C), is a unit of energy used to measure the energy content of foods. One kilocalorie is equal to 1,000 calories. So 100 kcal is the same as 100,000 calories. This unit is commonly used to measure the calorie or energy content of foods.

Quick Answers

– 100 kcal is the same as 100 kilocalories or 100,000 calories

– 1 kcal = 1,000 calories

– Kilocalories are commonly referred to as Calories (capital C) when discussing food energy content

– 100 Calories (food label) = 100 kcal

What is a Calorie?

First, it’s important to understand exactly what a Calorie is. A Calorie (capital C) is a kilocalorie, equal to 1,000 calories (lowercase c). A calorie is defined as the amount of energy needed to raise the temperature of 1 gram of water by 1°C. This is the small calorie or gram calorie. The large calorie, or kilocalorie, is equal to 1,000 small calories. To summarize:

  • 1 calorie (small cal, g calorie) = energy to raise 1 g water 1°C
  • 1 Calorie (large Cal, kcal) = 1,000 calories = 1 kcal

In nutrition, Calories refer to the kilocalorie. So when you see calorie counts on food labels, these are showing the energy content in kilocalories, commonly called Calories. Now, back to the original question – 100 Calories on a food label is equal to 100 kilocalories or 100,000 calories. This brings us to…

Kilocalories vs. Calories

The relationship between kilocalories (kcal) and calories (cal) is:

  • 1 kcal = 1,000 cal
  • 100 kcal = 100,000 cal

So 100 kilocalories is the same as 100,000 calories. This is why when looking at nutrition information, the energy content is displayed in kilocalories – to keep the numbers smaller and more manageable. For example, a food containing 400 Calories actually contains 400,000 calories of energy!

Kilocalorie Examples

Here are some examples to show what 100 kcal translates to in different food items:

Food 100 kcal Equivalent
Apple 1 small apple
Bread 1 slice white bread
Cheese 1.5 oz cheddar cheese
Chicken breast 1.7 oz roasted chicken breast
Chocolate bar 1 mini chocolate bar

Kilocalorie Conversion

To convert between kilocalories and calories:

  • Kilocalories to calories: Multiply kcal by 1,000
    • 100 kcal x 1,000 = 100,000 calories
  • Calories to kilocalories: Divide calories by 1,000
    • 100,000 calories / 1,000 = 100 kcal

Kilocalorie Intake

Knowing how many kilocalories are in the foods you eat each day can help with weight management. Here are some examples of daily kilocalorie needs:

  • Sedentary adult man: 2,500 kcal
  • Moderately active adult woman: 2,000 kcal
  • Active teenage boy: 3,000 kcal
  • Active child ages 4-8: 1,400-1,600 kcal

As you can see, kilocalorie needs vary significantly based on age, gender and activity level. Knowing how many kilocalories are in foods allows you to balance your intake with your needs.

Food Labels

For packaged foods like chips, yogurt, cereal, etc. the calorie or energy content is listed on the Nutrition Facts label. Here’s an example:

Serving Size 1 cup (28g)
Calories 100

As discussed earlier, the 100 Calories listed is equal to 100 kilocalories or 100,000 calories. This shows that one serving of this food provides 100kcal of energy. When counting your daily calorie intake, these food label listings are showing the kilocalorie content.

Weight Loss

When trying to lose weight, knowing kilocalories can help you create a calorie deficit. To lose 1 pound per week, you need a deficit of about 500 kilocalories per day. This can be achieved through any combination of eating less/healthier foods and increasing physical activity. Over 7 days that adds up to 3,500 kilocalories total, equal to 1 pound of fat loss.

Here are some tips for losing 1 pound per week by adjusting kilocalorie balance:

  • Reduce food intake by 250 kcal per day
  • Burn an extra 250 kcal per day through exercise
  • A combination approach:
    • Cut 250 kcal from diet
    • Burn 250 kcal through exercise

Tracking your intake in kilocalories and balancing it with calorie burn is key for safe, sustainable weight loss.

Weight Loss Calculator

Use this simple calculator to determine your daily kilocalorie target for losing 1 pound per week, based on your current weight. A deficit of 500 kcal per day results in 1 pound lost over a week.

Your weight: pounds

Kilocalories Burned Exercising

Physical activity and exercise burn kilocalories that can help create a calorie deficit. Here are estimates for how many kilocalories are burned per hour doing various exercises:

Exercise Kcal burned (hourly)
Walking at 3mph 200-300 kcal
Jogging at 5mph 400-500 kcal
Biking at 12-14mph 400-600 kcal
Swimming laps 400-700 kcal
High intensity cardio class 600-800 kcal

As shown, more vigorous exercise burns more kilocalories per hour. But keep in mind these are just estimates – actual burn varies based on specific workout details and individual factors.

Weight Maintenance

Once you’ve reached your goal weight, maintaining it requires energy balance. This means the kilocalories you consume equals the amount you burn each day. To determine your maintenance kilocalorie needs:

  1. Multiply your goal weight by 10. This gives your estimated base calorie needs.
  2. Adjust up or down based on your activity level:
    • Sedentary: No adjustment needed
    • Moderately active: Add 200-300 kcal
    • Very active: Add 400-500 kcal

For example, for a 150 pound moderately active woman:

  • 150 x 10 = 1,500 kcal (base needs)
  • Add 300 kcal for moderate activity
  • Daily maintenance = 1,800 kcal

Tracking kilocalories can help ensure you maintain your new weight loss and don’t creep back up.

Counting Kilocalories

Tracking your kilocalorie intake takes a little time at first, but gets quicker with practice. Follow these tips:

  • Use a calorie counting app/website – Makes lookup and tracking much easier
  • Weigh foods with a kitchen scale for accuracy
  • Look up kilocalories before eating out and choose wisely
  • Read all nutrition labels – pay attention to serving sizes
  • Log snacks and beverages – they add up!

Sticking to a daily kilocalorie target will get easier the more you practice. Apps can help take a lot of the guesswork out of tracking too.

Sample Daily Kilocalorie Count

To better understand how to tally up daily kilocalorie intake, here is a sample day’s count:

Food/Beverage Kilocalories
Oatmeal made with 1/2 cup oats and 1 cup milk 150 kcal
Black coffee 5 kcal
Turkey and cheese sandwich 400 kcal
Baby carrots, 3/4 cup 50 kcal
Greek yogurt, 5.3 oz 150 kcal
Chicken breast, grilled, 4 oz 120 kcal
Sauteed broccoli, 1 cup 50 kcal
Total 925 kcal

As you can see, all foods and beverages contain kilocalories that get tallied up for your daily total.


In addition to kilocalories, foods also provide micronutrients like vitamins, minerals and antioxidants. While kilocalories supply energy, micronutrients provide essential support for health and body functions. Some examples and their benefits:

Micronutrient Benefits
Vitamin C Immune function, antioxidant
Calcium Bone health
Vitamin A Vision, cell growth
Iron Oxygen delivery
Potassium Heart health, fluid balance

While kilocalories are mainly about energy balance, getting sufficient micronutrients each day ensures good health. Variety and moderation are keys to getting both macronutrients (like protein, carbs and fat) and essential micronutrients.

The Bottom Line

So in summary, how much is 100 kcal?

  • 100 kcal = 100 kilocalories = 100,000 calories
  • Kilocalories (Calories) measure the energy content in foods
  • Nutrition labels list Calories, which are actually kilocalories
  • Consuming 100 fewer kcal per day can lead to weight loss over time
  • Burning an extra 100 kcal through exercise contributes to weight loss

Understanding how much energy is contained in the foods we eat provides the knowledge needed to balance kilocalorie intake and output. While losing or maintaining weight isn’t just about calories in, calories out, knowing kilocalories and tracking intake provides useful guidance for achieving healthy eating goals.

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