KetoScope

Version 1.0

KetoScope

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Basal metabolism calculator

Compare Mifflin St Jeor and Katch McArdle and get a practical daily calorie estimate.

When to use

  • •If you want a baseline metabolism estimate before setting calories and macros.
  • •If you want to compare total-weight and lean-mass based formulas.
  • •If you are recalculating nutrition after changes in body weight or activity.
  • •If you need a simple daily calorie estimate without complex tables.
What result meansTipsFAQ

Enter parameters

System
Sex

Metabolism and calories

1,704 kcal
Mifflin St Jeor
1,684 kcal
Katch McArdle
2,626 kcal
Daily calories with activity

Both formulas are shown so you can compare a whole-body estimate with a lean-mass based one.

How to read it

4
Mifflin St Jeor uses sex, age, height, and weight and works well as a general baseline.
Katch McArdle uses lean mass, which is why it requires body fat percentage.
Daily calories are estimated from the average of both formulas adjusted by your activity level.
A difference between formulas is normal because they describe metabolism from different angles.

Tips

5
If body fat is only a rough guess, treat Katch McArdle as an extra reference rather than an exact value.
Use the result as a starting point, then adjust from body weight trend and how you feel.
Recalculate BMR and daily calories after meaningful changes in weight or activity.
Avoid changing both calories and activity at once if you want to understand what caused the change.
Keep the same activity setting for at least 2–3 weeks when comparing results.

FAQ

4
What is the difference between Mifflin St Jeor and Katch McArdle?

Mifflin St Jeor uses sex, age, height, and weight. Katch McArdle is based on lean mass and therefore needs body fat percentage.

Which formula should I trust more?

If body fat is uncertain, Mifflin St Jeor is usually the simpler baseline. If body composition is known more accurately, comparing both formulas is useful.

Why do I need an activity factor?

BMR reflects energy use at rest, while the activity factor helps estimate a more realistic total daily energy need.

Should I recalculate BMR after body weight changes?

Yes. A noticeable change in body weight, body fat, or activity level is a good reason to update the estimate.

Metabolic formulas provide an estimate, not a direct medical measurement.

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