Adaptive TDEE and next-set weight calculators

Two free calculators that use your own logged data rather than a population formula. They run entirely in your browser: nothing is stored and nothing is sent anywhere.

Adaptive TDEE

Estimates your real maintenance calories from your average intake and your weight change over at least a week, rather than from age and height.

Next-set weight

Takes the set you just finished, the reps you had left, and your target rep range, and suggests the next load rounded to real plates.

Where they are wrong

Both show their formulas and their limitations. A calculator sees one snapshot; it knows nothing about your fatigue or your history.