- Levine 2018
PhenoAge Calculator
Estimate your biological age from 9 standard blood biomarkers using the peer-reviewed Levine 2018 formula. Free, no signup.
10 inputsOpen - Insulin Resistance
HOMA-IR Calculator
Calculate Homeostatic Model Assessment for Insulin Resistance from fasting glucose and insulin. Key marker for metabolic health.
2 inputsOpen - Cardiovascular Risk
Triglyceride / HDL Ratio
One of the strongest single-number predictors of insulin resistance and atherogenic dyslipidemia. Often more revealing than LDL alone.
2 inputsOpen - A1C → eAG
A1C to Blood Sugar
Convert your A1C to estimated average glucose (eAG) in mg/dL and mmol/L, with the full conversion chart from optimal to the diabetes range.
1 inputOpen - Vermeulen 1999
Free Testosterone Calculator
Total testosterone can look normal while the free fraction is low. Calculate free and bioavailable T from total T, SHBG and albumin, plus the free androgen index.
3 inputsOpen - Insulin Resistance
TyG Index Calculator
The triglyceride-glucose index estimates insulin resistance from two values already on your standard panel — no fasting insulin draw needed.
2 inputsOpen - Iron Status
TSAT Calculator (Transferrin Saturation)
Ferritin rises with inflammation and can look normal while iron stores are empty. TSAT is the marker that does not. Accepts TIBC, UIBC or transferrin.
2 inputsOpen - Muscle Proxy
Sarcopenia Index
Creatinine comes from muscle, cystatin C does not — so their ratio carries a muscle signal neither marker shows alone. Shown without a false cutoff.
2 inputsOpen - Lp(a) Units
Lp(a) Unit Converter
US labs report mg/dL, most others nmol/L. Converts between them and returns a range, because no exact conversion between the two actually exists.
1 inputOpen - Vitamin D Units
Vitamin D Converter
US labs report 25-OH vitamin D in ng/mL, the UK, Canada and Europe in nmol/L. Converts exactly in both directions and shows where your level sits.
1 inputOpen - Zone 2 Training
Zone 2 Heart Rate
Get your Zone 2 training band in bpm from your age — the low-intensity zone that builds aerobic base and raises VO2 max with the least fatigue.
1 inputOpen
These tools are educational, not diagnostic. Calculators implement the formulas exactly as published. They do not replace a clinical evaluation. If a result concerns you, talk to a physician.