How does Fitdigits count calories? This question pops up more often then a Whack-a-Mole from those who care about the balance of calories and is touched on many times by others who are just curious. For example, many question why the calories on a manually entered workout are so different from that on shown on a Treadmill or during a workout where heart rate is used.

## Background / Overview

- Everyone is different. Yep – even though we share 99% of the same DNA and makeup, that 1% is a doozy of a difference.
- Everyone changes constantly – the more we seem to stay the same, the more we change. A wise man once said “No man stands in the same river twice”. As your fitness level and health changes, so does the number of calories you burn on a constant basis.
- Women and men burn energy (calories) differently. Sorry girls – you just don’t burn calories as quickly, all other things equal.
- Younger people tend to burn energy (calories) more quickly.
- When tracking caloric intake (with a great app like MyFitnessPal) and true calories burned (with a great app like Fitdigits) you’ll get the most accurate, scientific approach to weight management. The most successful people use this method – check out some of the success stories

## Things That Affect Calorie Burn

- Your weight – bigger people burn more calories, all other things equal. It takes more effort to walk an 18 minute mile for a 200lb person than it does for a 150lb person.
- Your Gender (see #3 above).
- Your Age (if you are not using heart rate and have not taken a personal Fitness Assessment).
- Your fitness level. Fit people have fine-tuned their bodies into calorie burning machines, and are just plain better at burning calories.
- What type and the intensity of your workout. This can be represented in a number called a “Metabolic Equivalent Table” (MET) number

-OR-

This can be more accurate with Heart Rate Monitoring– your heart rate actually is WAY more accurate at determining how hard your system is working than guessing at a number located in a table generated from generic testing. - Time. How long did you workout?

## Show Me The Numbers!

OK. Let’s look at a couple different scenarios.

**(Bad) Calorie Calculations by Gym Machine Calculations / Activity trackers**

If a machine, like a treadmill, knows nothing about you, they will probably use this formula:

Total Calories Burned = Duration in Minutes x (((MET – a number representing the type and intensity of your workout) x 3.5 x 70)/200).

So for an hour long jog the formula would be

Total Calories Burned = 60 x ((5 x 3.5 x 70)/200) = 367 calories.

The MET is a number they guessed, like 5 (from a range of maybe 3 to 16, based on speed) as a guesstimate of how hard you worked and 70Kg (154lbs) is their guesstimate of how much you weigh.

**(Better) The Fitdigits Manual Calorie Calcs**

When you have a person’s weight and can measure basic workout intensity either through self-reporting or by looking at speed/pace, you can start to refine the calorie calculations a bit. The formula is:

Total Calories Burned = Duration in Minutes x (((MET – a number representing the type and intensity of your workout) x 3.5 x your weight in kg)/200).

In this scenario, Fitdigits uses a sliding scale of MET values based on the type of activity chosen and the speed/pace of the workout, cross-referenced with the gender, age and estimated fitness level of the individual (or calculated fitness level/VO2 Max, if they have done a Fitness Assessment), applied to the standard MET tables.

It does assume a flat surface, which isn’t always reflective of reality though, but does get much closer to a real caloric burn number.

If there is no speed/pace (due to no GPS), then calorie calculations are done based on the user-specified Intensity, cross-referenced with the users gender, age and fitness level, if it exists.

**(BEST) Calorie Calculations Using Heart Rate – Fitdigits with Heart Rate**

With heart rate information, we can actually get very close to real, honest caloric burn numbers.The accurate calculation of calories burned by heart rate is optimized for the heart rate to be between 90 bpm and 150 bpm.

The drivers are: Gender, Weight (kg), Height and VO2max (Fitness Level). The VO2max number is an estimate of fitness level based on a persons age and self-reported fitness level, or a calculated, much more accurate number if an Assessment has been completed.

**The formulas:**

Men: C/min = (-59.3954 + (-36.3781 + 0.271 x age + 0.394 x weight + 0.404 x VO2max + 0.634 x HR))/4.184

Women: C/min = (-59.3954 + (0.274 x age + 0.103 x weight + 0.380 x VO2max + 0.450 x HR)) / 4.184

*Note: Exercise burn formulas are built around total caloric output during exercise — which typically includes BMR.*

## Kilojoules and Calories

Kilojoules are calculated by the readings we get from the power meters. To convert them to Calories, we take the value of the kilojoule to calories formula and include the metabolic efficiency ratio (typically 20-25%). In detail, a Calorie calculated from 1 kilojoule = 1 / 4.184 / .25 = 1.046 Cal of workout

## Calories Per Minute (CPM)

Fitdigits also shows caloric information in terms of “CPM” or Calories Per Minute. This can be an interesting way of thinking about your common activities. Which ones burn the most in the least time, realizing that time dedication really does matter. Also, you can calculate how many minutes will it take to burn off that pint of Ben & Jerrys! 🙂

You can add CPM to any Custom Dashboard). Kind of neat to see how your effort affect burn in a more standardized way!

So now you know how we come up with accurate caloric burn data for you. Now what?

## MyFitnessPal

The final piece of the equation is MyFitnessPal. MyFitnessPal takes inventory of everything you eat. Enter in your meals using MyFitnessPal’s enormous library of foods, and it will tell you how many calories you ingested. You can also set weight loss goals so that MyFitnessPal will instruct you on how many calories you can eat based on how much you are working out. Set a goal and reach it with Fitdigits and MyFitnessPal!

**References:**

http://www.calories-calculator.net/Calories_Burned_By_Heart_Rate.html

http://www.calories-calculator.net/Calculator_Formulars.html#burned_by_hr

"…self-reported fitness level

self-reported fitness level,seems like very subjective factor, which in turn suggests the calories burned" not a reliable number

For cyclists, how are calories burned affected by hill climbing vs. descent?

Had reached 97 kg when I decided I had to do something, I felt like reduced mobility, tired quickly, I lean hard. I was recommended a very publicized that gave amazing results many people and I decided to try it myself. There are pills that help burn fat very well and is also recommended by doctors as being very safe. In about two months I got to the weight of 68 kg and I stopped taking the pills. Now keep in shape by doing different sports easier when I have time. This product I recommend to everybody because I think it is the best. I hope I have been as little help with my intervention, I bought him at the address below:

http://mhlnk.com/194C96E7

Do a fitness assessment and it is no longer as subjective. Just sayin…

Rodger Dawson: if you are a cyclist, get a power meter to measure your wattage, as that is the best way to measure your workout intensity-duration total, regardless of whether you are flat, going up or down hills, etc.

http://www.competitivecyclist.com/powermeters-computers

Sorry, I want to know reference of this formular

Total Calories Burned = Duration in Minutes x (((MET – a number representing the type and intensity of your workout) x 3.5 x 70)/200).

Does the formula w/ Heart Rate subtract out BMR (or RMR) or does it give you gross calories burned? Also, I've heard that heart rate and VO2max based calculations are not relying for resistance/strength/weight training. Is that true?

There is no calorie data at all. It's fine that you talk about your equations…but can you put up a guide or user manual or something that says how to enter that data? How do we get the software to do these calculations?

Please answer the previous question from Mar 9. I'm wonder, too.

Why call it "The Digifit Way"?

That's like breaking down with the Moonwalk and saying, "I'm dancing like Michael J Fox!" https://www.youtube.com/watch?v=yRM6Q3Ey3wU

IOW, please provide references, Author Christopher Means http://blog.digifit.com/author/chrismeans/

I don't use my fit bit for six months and took off my battery, wondering why shows activity on those months I didn't use?