Free Tools
Fitness Calculators
Evidence-based tools from SensAI's programming engine — free for everyone.
1RM Calculator
Estimate your one-rep max from any set using Epley, Brzycki, and Lander formulas.
Warm-Up Sets
Program-specific warmup ramps for SensAI, Starting Strength, 5×5, Greyskull LP, and max singles.
Heart Rate Zones
5-zone training ranges from age-based, max HR, or lactate threshold methods with optional Karvonen.
TDEE Calculator
Daily calorie needs and macro splits for fat loss, maintenance, and muscle gain.
RPE ↔ Percentage
Convert RPE to percentage of 1RM with the standard RTS chart. See reps in reserve instantly.