> For the complete documentation index, see [llms.txt](/llms.txt).
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- health
26 endpoints

# Health API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Body Metrics
[
BMI Calculator bmi-calculator
Calculate Body Mass Index, BMI Prime, and healthy weight range in metric or imperial units.
1cr · v2026-04-22
](/tools/bmi-calculator/) [
Body Fat Percentage Calculator body-fat-percentage-calculator
Estimate body fat percentage with the US Navy method and age-adjusted healthy ranges.
1cr · v2026-04-22
](/tools/body-fat-percentage-calculator/) [
Body Surface Area Calculator body-surface-area-calculator
Estimate body surface area using Mosteller, Du Bois, or Haycock formulas.
1cr · v2026-04-22
](/tools/body-surface-area-calculator/) [
Child Height Predictor child-height-predictor
Predicted adult height from parents' heights via the mid-parental (Tanner) method with range and adult percentile.
1cr · v2026-04-22
](/tools/child-height-predictor/) [
Ideal Weight Calculator ideal-weight-calculator
Ideal body weight via Devine, Robinson, Miller, and Hamwi formulas with frame-size adjustment and healthy BMI range.
1cr · v2026-04-22
](/tools/ideal-weight-calculator/) [
Lean Body Mass Calculator lean-body-mass-calculator
Lean body mass via Boer, James, and Hume equations with estimated body fat percentage and category.
1cr · v2026-04-22
](/tools/lean-body-mass-calculator/) [
Waist to Hip Ratio Calculator waist-to-hip-ratio-calculator
Waist-to-hip ratio with WHO risk category, body shape pattern, and the waist target for a healthy ratio.
1cr · v2026-04-22
](/tools/waist-to-hip-ratio-calculator/)
Diabetes
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Blood Sugar Converter blood-sugar-converter
Convert blood glucose between mg/dL and mmol/L with fasting-range category and reference table.
1cr · v2026-04-22
](/tools/blood-sugar-converter/) [
HbA1c Calculator hba1c-calculator
Convert between HbA1c percentage and estimated average glucose (mg/dL and mmol/L) with ADA interpretation.
1cr · v2026-04-22
](/tools/hba1c-calculator/)
Fitness
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Heart Rate Zone Calculator heart-rate-zone-calculator
Estimate heart-rate training zones using max-heart-rate or Karvonen formulas.
1cr · v2026-04-22
](/tools/heart-rate-zone-calculator/) [
Max Heart Rate Calculator max-heart-rate-calculator
Maximum heart rate from six validated formulas (Fox, Tanaka, Gellish, Gulati, Nes, Arena) with training zones.
1cr · v2026-04-22
](/tools/max-heart-rate-calculator/) [
One Rep Max (1RM) Calculator one-rep-max-calculator
One-rep max estimated by seven formulas (Brzycki, Epley, Lander, Lombardi, Mayhew, O'Conner, Wathan) with training zones and warm-up sets.
1cr · v2026-04-22
](/tools/one-rep-max-calculator/) [
Steps to Distance Calculator steps-to-distance-calculator
Estimate distance walked or run from a step count and height.
1cr · v2026-04-22
](/tools/steps-to-distance-calculator/)
Hydration
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Water Intake Calculator water-intake-calculator
Estimate daily water intake from body weight, activity, and hot-weather adjustment.
1cr · v2026-04-22
](/tools/water-intake-calculator/)
Kidney Function
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Creatinine Clearance Calculator creatinine-clearance-calculator
Estimate creatinine clearance with the Cockcroft-Gault equation and CKD stage.
1cr · v2026-04-22
](/tools/creatinine-clearance-calculator/) [
FENa Calculator fena-calculator
Fractional excretion of sodium (FENa) with prerenal / indeterminate / intrinsic-renal interpretation.
1cr · v2026-04-22
](/tools/fena-calculator/) [
GFR Calculator gfr-calculator
Estimated GFR via CKD-EPI 2021 (primary), CKD-EPI 2009, MDRD, and Cockcroft-Gault with CKD staging.
1cr · v2026-04-22
](/tools/gfr-calculator/)
Lab Values
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ANC Calculator anc-calculator
Absolute neutrophil count from CBC values with NCI CTCAE neutropenia grading.
1cr · v2026-04-22
](/tools/anc-calculator/) [
BUN to Creatinine Ratio Calculator bun-to-creatinine-ratio-calculator
Calculate the BUN to creatinine ratio with unit conversion and reference range.
1cr · v2026-04-22
](/tools/bun-to-creatinine-ratio-calculator/) [
Corrected Calcium Calculator corrected-calcium-calculator
Albumin-corrected calcium (Payne 0.8 or modified 0.6 coefficient) with clinical interpretation.
1cr · v2026-04-22
](/tools/corrected-calcium-calculator/) [
Corrected Sodium Calculator corrected-sodium-calculator
Hyperglycemia-corrected sodium via Katz and Hillier formulas with severity interpretation.
1cr · v2026-04-22
](/tools/corrected-sodium-calculator/)
Nutrition
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Caffeine Limit Calculator caffeine-overdose-calculator
Estimate a safe daily caffeine limit and what it equals in drinks.
1cr · v2026-04-22
](/tools/caffeine-overdose-calculator/) [
Calorie Deficit Calculator calorie-deficit-calculator
Estimate daily calorie deficit, target intake, and projected weight-loss trend.
1cr · v2026-04-22
](/tools/calorie-deficit-calculator/) [
Protein Intake Calculator protein-intake-calculator
Estimate daily protein intake and per-meal targets from weight and training goal.
1cr · v2026-04-22
](/tools/protein-intake-calculator/)
Pregnancy
[
Due Date Calculator due-date-calculator
Pregnancy due date via Naegele's rule from LMP, conception date, or ultrasound, with trimester milestones.
1cr · v2026-04-22
](/tools/due-date-calculator/) [
Gestational Age Calculator gestational-age-calculator
Work out gestational age in weeks and days plus the estimated due date.
1cr · v2026-04-22
](/tools/gestational-age-calculator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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