8 tools covering training readiness, sleep, body composition, and metabolic baselines. Start with BMR and TDEE to set your baseline numbers, then use Recovery Optimizer and Sleep Optimizer to check what's limiting progress.
Calorie targets, training capacity, and body composition all trace back to the same handful of baseline numbers: your BMR, your TDEE, your body composition, and whether your recovery and hormones can support the training load you're asking for. Get these wrong and every downstream tool, calorie planner, workout generator, inherits the error.
Start with the BMR and TDEE Calculators to set your metabolic baseline, they feed every calorie target on the platform. Use BMI and FFMI to check body composition context, BMI alone doesn't distinguish muscle from fat, FFMI does. If progress feels stalled despite correct numbers, the Recovery Optimizer, Sleep Optimizer, and Hormonal Health Optimizer check whether readiness, sleep, or hormonal signals are the actual bottleneck.
Every engine backed by research. Every output tailored to you.
Calculates your basal metabolic rate using the Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, and Cunningham equations, then cross-validates against your body composition inputs for greater precision. Output feeds directly into TDEE and Calorie Planner calculations.
Metabolic Science Try It FreeEstimates total daily energy expenditure using the Mifflin-St Jeor and Katch-McArdle equations, weighted by training frequency and non-exercise activity. More accurate than standard TDEE tools because it accounts for body composition and metabolic adaptation from prior dieting.
Metabolic Science Try It FreeStandard WHO BMI plus the WHO Asia-Pacific cutoffs for South and East Asian populations, who face higher metabolic risk at a lower BMI than global thresholds assume. Adds a waist-to-height ratio check for central adiposity that BMI alone cannot capture.
Body Composition Try It FreeFat-Free Mass Index using the Kouri et al. 1995 formula, the same calculation used across every AadiFit tool that reports FFMI. Compares your muscularity fairly against natural-lifter benchmarks and adds frame-size context from wrist and ankle circumference.
Body Composition Try It FreeEstimates body fat percentage, lean mass, and fat-free mass index using multiple validated methods including Navy formula, DEXA approximation, and skinfold-based equations. Cross-validates results to reduce single-method error and flags visceral fat risk and sarcopenia thresholds.
Anthropometry Try It FreeScores training readiness across five pillars: acute-to-chronic workload ratio, sleep quality, psychological readiness, life stress load, and HRV trend. Combines these into a single readiness percentage that tells you whether to push, maintain, or deload today.
Readiness Science Try It FreeAssesses your current sleep patterns against benchmarks for recovery, testosterone production, cortisol regulation, and next-day training performance. Identifies which phases of your sleep architecture are breaking down and outputs a prioritised intervention list.
Recovery Science Try It FreeScreens lifestyle, sleep, nutrition, and training variables against hormonal health benchmarks for testosterone, estrogen balance, cortisol, and thyroid function. Identifies the patterns most likely suppressing your hormones and outputs a natural optimisation protocol.
Endocrine Science Try It FreeStart with the BMR Calculator and TDEE Calculator to establish your baseline metabolic numbers, they feed every calorie target on the platform. Then use the Recovery Optimizer and Sleep Optimizer to check whether your training readiness or sleep is limiting progress.
BMI estimates weight status from height and weight alone and doesn't distinguish muscle from fat. FFMI (Fat-Free Mass Index) specifically measures muscularity relative to height, useful for comparing how much lean mass you're carrying against natural-lifter benchmarks. A muscular person can have a "high" BMI and a completely normal FFMI.
Yes, all 8 tools are free to use with no account required for a single result. Saving your history and getting trend tracking over time requires a free account; premium plans add AI coaching notes.