Tools
Health calculators and tools
Free calculators based on published formulas: HOMA-IR, eGFR, LDL, calories, protein, heart rate zones, caffeine, BMI and free testosterone. Each one shows the source of its formula and its limitations.
Calculators
- HOMA-IR calculatorCalculate HOMA-IR from fasting glucose and insulin (mg/dL or mmol/L). Interpretation ranges, limitations of the formula and sources.Open
- eGFR calculator (CKD-EPI 2021)Calculate estimated glomerular filtration rate (eGFR) with the CKD-EPI 2021 formula from creatinine, age and sex. KDIGO categories G1–G5.Open
- LDL calculator (Friedewald and Sampson)Calculate LDL from total cholesterol, HDL and triglycerides with the Friedewald and Sampson (NIH) formulas, plus non-HDL cholesterol. mg/dL and mmol/L.Open
- Calorie calculator (BMR and TDEE)Calculate your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) with the Mifflin-St Jeor formula, including activity level.Open
- Protein calculatorCheck your approximate daily protein needs in grams and in g/kg of body weight: for adults, older adults and people who strength train.Open
- Heart rate zones calculatorCalculate your maximum heart rate with the Tanaka formula and five training zones (percent of HRmax or the Karvonen method using resting heart rate).Open
- Caffeine calculatorAdd up caffeine from coffee, tea, cola and energy drinks and compare it with the EFSA limit: 400 mg a day for adults, 200 mg in pregnancy.Open
- BMI and WHtR calculatorCalculate BMI and waist-to-height ratio (WHtR): WHO categories and the cardiometabolic risk associated with abdominal obesity.Open
- Free testosterone calculator (Vermeulen)Calculate free testosterone from total testosterone, SHBG and albumin with the Vermeulen formula. nmol/L and ng/dL conversion, guideline-based indicative thresholds.Open
- Supplement-Drug Interaction CheckerPick your supplements and medications to see documented interactions: what happens, what to do and where to read more. Based on VitMode articles and PubMed.Open
More VitMode tools
- Blood Test InterpreterEnter your blood test results and see them in the context of reference ranges.
- Find SupplementsA short quiz that suggests supplements matching your goals.
- Stack BuilderBuild your supplement stack and see how the components complement each other.
- Supplement comparison toolCompare supplements by evidence, safety and uses.