Free Health Tools
Evidence-based calculators and tools to help you understand your health better. All tools run locally in your browser — no data is sent anywhere.
Biomarker Interpreters & Calculators
HOMA-IR Calculator
Estimate insulin resistance from your fasting glucose and fasting insulin. Supports mg/dL and mmol/L.
Use tool →HbA1c ↔ Average Glucose
Convert between HbA1c %, mmol/mol, and estimated average glucose (mg/dL or mmol/L) instantly.
Use tool →eGFR Calculator (CKD-EPI 2021)
Estimate kidney function from serum creatinine using the 2021 race-free CKD-EPI equation. View your CKD stage.
Use tool →Vitamin D Level Interpreter
Find out if your 25-OH vitamin D is deficient, sufficient, or in the optimal range. Converts ng/mL to nmol/L.
Use tool →Ferritin Level Interpreter
Check whether your ferritin is low, normal, or elevated. Reference ranges by sex and age, plus what high values can mean.
Use tool →Iron Saturation (TSAT) Calculator
Calculate transferrin saturation from serum iron and TIBC. Distinguishes absolute from functional iron deficiency.
Use tool →Cholesterol Ratio Calculator
Compute Total/HDL, LDL/HDL, and TG/HDL ratios with cardiovascular risk context. Supports mg/dL and mmol/L.
Use tool →Lipid Panel Interpreter
Per-component categorisation for Total Cholesterol, LDL, HDL, Triglycerides, and Non-HDL using NCEP ATP III cutoffs.
Use tool →Blood Pressure Category Checker
Classify your reading per AHA 2017 or ESC/ESH 2023 guidelines. Flags hypertensive crisis explicitly.
Use tool →Uric Acid Level Interpreter
Sex-specific hyperuricemia categorisation, gout flare risk, dietary triggers, and treatment thresholds.
Use tool →Thyroid Panel Interpreter
TSH, Free T4, Free T3 categorisation with ATA pregnancy ranges and subclinical thyroid dysfunction context.
Use tool →Vitamin B12 Level Interpreter
Total B12 with optional MMA and holoTC. Flags borderline deficiency, vegan risk, metformin association.
Use tool →Mean Arterial Pressure Calculator
Compute MAP and pulse pressure from systolic and diastolic readings. Tachycardia-corrected estimate available.
Use tool →FIB-4 Calculator
Compute the Fibrosis-4 liver index from age, AST, ALT, and platelets, with the published Sterling 2006 cutoffs.
Use tool →TyG Index Calculator
Triglyceride-glucose index from fasting triglycerides and glucose, studied as an insulin-resistance surrogate. mg/dL and mmol/L.
Use tool →LDL Cholesterol Calculator
Estimate LDL-C with the Sampson-NIH 2020 equation, with the classic Friedewald estimate shown for comparison. mg/dL and mmol/L.
Use tool →Non-HDL Cholesterol Calculator
Total cholesterol minus HDL, the cholesterol carried by all atherogenic particles, with published reference goals.
Use tool →Remnant Cholesterol Calculator
Total cholesterol minus HDL minus LDL, a research cardiovascular marker. mg/dL and mmol/L.
Use tool →TG/HDL Ratio Calculator
Triglyceride-to-HDL ratio from your lipid panel, on the mg/dL basis the published cutoffs use. mg/dL and mmol/L inputs.
Use tool →Free Testosterone Calculator
Calculated free and bioavailable testosterone from total testosterone, SHBG, and albumin using the Vermeulen equation.
Use tool →Corrected Calcium Calculator
Albumin-adjusted serum calcium using the Payne 1973 formula. mg/dL and mmol/L.
Use tool →eAG Calculator
Estimated average glucose from HbA1c (mg/dL and mmol/L) using the ADAG study formula, with ADA categories.
Use tool →Anion Gap Calculator
Serum anion gap from sodium, chloride, and bicarbonate, with optional potassium and albumin correction.
Use tool →Blood Work Tools
Convert lab values directly inside your lab portal — no copy-paste, no switching tabs. Free Chrome browser extension.
Blood Test Unit Converter
Convert lab values between mg/dL, mmol/L, µg/dL, nmol/L, and other common units for 50+ biomarkers.
Use tool →Common Conversions: Answer Pages
Pre-computed answer pages for the most-searched values by biomarker: glucose, LDL, HDL, total cholesterol, triglycerides, HbA1c, and more.
Use tool →Lab Test Abbreviation Lookup
Look up what TSH, ALT, CBC, HbA1c, and 100+ other lab test abbreviations mean.
Use tool →Fasting Timer for Blood Tests
Set your appointment time and get a countdown timer with fasting guidelines for accurate results.
Use tool →Blood Test Prep Checklist
Select your upcoming tests and get a personalized preparation checklist for the most accurate results.
Use tool →Blood Test Frequency Guide
Find out how often you should get blood work done based on your age, sex, and health profile.
Use tool →Body & Nutrition Calculators
BMI Calculator
Calculate your Body Mass Index with both metric and imperial units. Includes WHO category breakdown.
Use tool →TDEE Calculator
Estimate your Total Daily Energy Expenditure using the Mifflin-St Jeor equation and your activity level.
Use tool →Water Intake Calculator
Find out how much water you should drink daily based on your weight, activity level, and climate.
Use tool →Macro Calculator
Get your ideal protein, carb, and fat split based on your calorie needs and fitness goal.
Use tool →Body Fat Percentage Calculator
Estimate body fat % using the US Navy circumference method. Sex-specific category bands per ACE.
Use tool →FFMI Calculator
Fat-Free Mass Index with Kouri normalisation. Useful for tracking lean-mass progress in trained individuals.
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