Calculators Every Fitness Coach Should Bookmark

Coaches who guess client numbers lose clients. Calculators turn vague advice into a programme with milestones.

Google this topic and you will get a hundred answers, half of them wrong. Here is the version that holds up. Coaches who guess client numbers lose clients. Calculators turn vague advice into a programme with milestones.

TDEE

Maintenance calories for diet planning.

BMR (Mifflin-St Jeor + Katch-McArdle)

Cross-check before pulling the trigger on a cut.

Body fat estimate

US Navy tape method when callipers aren't available.

1RM strength

Estimated max from sub-max sets — program intensity.

Macro calculator

Protein, fat, carb targets matched to TDEE.

Heart rate zones

Build cardio plans around aerobic base.

VO2 max estimate

Indirect fitness benchmark, useful for tracking progression.

Pro tips

  • Recalculate every 4–6 weeks during cuts.
  • Always document the inputs you used so you can audit later changes.

Frequently asked questions

Are calculators substitutes for testing? No — they're approximations. DEXA, VO2 lab tests are gold standard.

What's the most common coaching mistake with calculators? Treating outputs as exact. They're starting points, then adjust on real results.

If you only remember one thing from this post, make it that the inputs matter more than the calculator.

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