Free health tools, no account needed
Calculators that turn your lab results into plain-language insights — plus a free AI health assessment that maps your symptoms to personalized patterns.
Free Health Assessment
3 minutes, 13 health topics, personalized AI report by email.
Metabolic health calculators
Instant, research-backed scores from the lab values you already have. Free forever, no account needed — with reference ranges and plain-language interpretation.
HOMA-IR Calculator
Estimate insulin resistance from fasting glucose and insulin — includes the QUICKI sensitivity index.
TyG Index Calculator
Combine fasting triglycerides and glucose into a single insulin-resistance marker — no insulin assay needed.
TG/HDL Ratio Calculator
Pull a cardiometabolic risk signal straight from your standard lipid panel.
Cholesterol Ratio Calculator
Two cholesterol ratios from your standard lipid panel — TC/HDL and LDL/HDL, with reference bands and conversion-free mmol/L math.
VLDL Calculator
Estimate VLDL and LDL cholesterol from a standard lipid panel — the Friedewald equations, with the TG≥400 limits spelled out.
Waist-to-Height Ratio Calculator
Check central adiposity with just a tape measure — keep your waist to less than half your height.
Body Roundness Index (BRI) Calculator
Body Roundness Index from waist + height — the tape-measure metric that models body shape, not just weight.
A Body Shape Index (ABSI) Calculator
A Body Shape Index from waist, height, and weight — with a z-score against people your age and sex (NHANES reference).
Waist-to-Hip Ratio Calculator
Waist ÷ hip with two tape measurements — WHO cut-offs for men and women, and how-to-measure guidance.
Metabolic Syndrome Risk Score
Count how many of the five published metabolic syndrome criteria your numbers currently meet.
ApoB/ApoA1 Ratio Calculator
Measure the balance between atherogenic and protective lipoprotein particles from an advanced lipid panel.
A1c ↔ Average Glucose Converter
Convert A1c to estimated average glucose (eAG) or average glucose back to A1c — bidirectional, with reference chart.
Cholesterol Units Converter (mg/dL ↔ mmol/L)
Convert cholesterol and triglycerides between mg/dL and mmol/L — bidirectional, with the exact factors for each.
Non-HDL Cholesterol Calculator
Total cholesterol minus HDL — all atherogenic particles in one number, no fasting or triglyceride limits.
AIP Calculator (Atherogenic Index of Plasma)
The Atherogenic Index of Plasma — log of TG/HDL linked to LDL particle size, with correct mmol/L handling.
Blood Sugar Converter (mg/dL ↔ mmol/L)
Convert blood glucose between mg/dL and mmol/L — bidirectional with the ÷18 factor and a reference chart.
Thyroid health calculators
Ratio-based views of your thyroid labs — conversion, axis balance, and the numbers behind the numbers. Free, no account needed.
Thyroid Ratio Calculator
Three ratio views of your thyroid labs in one page: FT3/rT3, FT3/FT4, and Jostel's TSH Index.
Nutrient status tools
Environment- and symptom-based estimators for nutrient status — no lab order required. Free, no account needed.
UVB Vitamin D Synthesis Calculator
Estimate how much midday sun your skin type needs for vitamin D synthesis at today's UV index.
Copper/Zinc Ratio Calculator
Copper ÷ zinc from two serum values — the balance functional medicine practitioners read as one number.
Transferrin Saturation Calculator (TSAT)
TSAT from serum iron + TIBC — iron status percentage with reference bands and ferritin pairing guidance.
Omega-3 Index Calculator (with Omega-6:3 Ratio)
Calculate your omega-3 index from EPA + DHA on a fatty acid panel, plus your omega-6:3 ratio — with research-convention bands.
Immune & inflammation calculators
Research-backed composite markers from routine lab values — inflammation and immune context in plain language. Free, no account needed.
hs-CRP:Albumin Ratio Calculator
Combine inflammation and nutritional status into one research-grade composite marker.
NLR Calculator (Neutrophil-to-Lymphocyte Ratio)
Neutrophil-to-lymphocyte ratio from a standard CBC differential — an immune-balance signal with research-cohort reference bands.
Albumin/Globulin (A/G) Ratio Calculator
A/G ratio from albumin + total protein (or look up the printed value) — with an interpretation table for high and low readings.
Gut health tools
Simple, shareable tools for digestive health — interpret what your body is telling you. Free, no account needed.
Bristol Stool Chart Interpreter
The seven-type chart clinicians actually use — pick what you see, get a plain-language read.
Men's health calculators
Hormone math from the lab values you already have — free and bound fractions, ratios, and what they mean. Free, no account needed.
Free Testosterone Calculator
Calculated free testosterone from total T, SHBG, and albumin — the Vermeulen equation, with percent free T.
Hormone health calculators
Ratio-based views of your hormone labs — estrogen/progesterone balance, FSH/LH, T/E2, and the numbers behind the numbers. Free, no account needed.
Estrogen to Progesterone Ratio Calculator
Check the balance between estrogen and progesterone from your lab report — Pg/E2 and the inverse ratio, with reference bands.
FSH LH Ratio Calculator
Compute your LH:FSH or FSH:LH ratio from day-3 labs — with an interpretation table and plain-language context.
Testosterone to Estradiol Ratio Calculator (T/E2)
Your T/E2 ratio from testosterone (ng/dL) and estradiol (pg/mL) — with the unit math made explicit and honest community-convention context.
Liver health calculators
Pattern-based views of your liver enzymes — the numbers behind the numbers on a standard metabolic panel. Free, no account needed.
AST/ALT Ratio Calculator (De Ritis)
The De Ritis ratio from your liver panel — AST ÷ ALT with a pattern interpretation table and plain-language context.
FIB-4 Score Calculator (Fibrosis-4 Index)
FIB-4 fibrosis screening score from age, AST, ALT, and platelets — with standard risk bands and age-adjusted cutoffs.
APRI Calculator (AST-to-Platelet Ratio Index)
APRI score from AST and platelet count — the original biopsy-free liver fibrosis screening index, with standard cutoffs explained.
General chemistry calculators
The classic ratios and corrections hiding in a standard metabolic panel (CMP) — kidney context, calcium status, acid-base balance. Free, no account needed.
BUN/Creatinine Ratio Calculator
BUN ÷ creatinine from your metabolic panel — the classic ratio for reading kidney values in context, with textbook reference bands.
Corrected Calcium Calculator
Albumin-corrected calcium via the Payne formula — what your total calcium really means when albumin is off, with reference bands.
Anion Gap Calculator
Anion gap from sodium, chloride, and bicarbonate — the first-step acid-base signal on any metabolic panel, with textbook ranges.
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