BioMind Smart Tools — Free Medical Calculators & Converters

📏 Universal Measurement Converter

The units used in medicine and science, converted instantly — in both directions.

⚖️ BMI & Healthy Weight Range

Body Mass Index shows whether a weight is in the healthy range for a person's height (adults 20+).

Weight (kg)

Height (cm)

How it works: BMI = weight (kg) ÷ height (m)². Categories (CDC): underweight below 18.5 · healthy 18.5–24.9 · overweight 25.0–29.9 · obesity 30 and above. Healthy weight range = 18.5 × h² to 24.9 × h². BMI is a screening measure — it does not measure body fat directly and may misclassify very muscular people. Source: CDC, Adult BMI Categories.

📚 Learn more: the academy's lesson “How to Lose Weight — and Keep It Off”.

← All tools

🔥 Calorie & Protein Needs

Estimate how many calories your body burns each day, a sensible target for your goal, and how much protein to aim for.

Sex

Age (years)

Weight (kg)

Height (cm)

Activity level

Goal

How it works: resting burn (BMR) uses the Mifflin–St Jeor equation — women: 10W + 6.25H − 5A − 161; men: 10W + 6.25H − 5A + 5 (W = kg, H = cm, A = age). Daily burn (TDEE) = BMR × activity factor. Losing ≈ 500 kcal/day below TDEE gives roughly 0.5 kg (1 lb) per week. Protein: the NIH recommended allowance is 0.8 g per kg body weight; during weight loss, 1.2–1.6 g/kg helps protect muscle. Sources: Mifflin et al. (1990); NIH Dietary Reference Intakes; CDC weight-loss guidance.

📚 Learn more: the academy's course Healthy Eating & Weight.

← All tools

💧 Daily Water Intake

How much water to drink each day, based on your body weight and activity.

Weight (kg)

Exercise today (minutes)

Climate

How it works: a widely used clinical guide is 30–35 mL of water per kg of body weight per day, plus roughly 350–500 mL for every 30 minutes of exercise. For context, the National Academies set total water adequate intakes at about 2.7 L/day for women and 3.7 L/day for men — that total includes water from food, which provides roughly a fifth. Thirst, pale-yellow urine, and your clinician's advice (especially with kidney or heart conditions) come first. Source: National Academies Dietary Reference Intakes.

📚 Learn more: the academy's lesson “The Healthy Plate”.

← All tools

❤️ Blood Pressure Checker

Enter a blood pressure reading to see where it falls on the standard ACC/AHA category chart. This is educational information about a single reading — not a diagnosis.

Systolic (top number, mmHg)

Diastolic (bottom number, mmHg)

The standard chart (ACC/AHA): Normal — below 120 and below 80 · Elevated — 120–129 and below 80 · Stage 1 range — 130–139 or 80–89 · Stage 2 range — 140 or higher, or 90 or higher · Severely elevated — above 180 and/or above 120. A reading is placed by its higher number. Blood pressure is diagnosed from averaged, repeated measurements — a single reading cannot diagnose anything. Source: American Heart Association / American College of Cardiology blood pressure guidance.

📚 Learn more: heart-health lessons at the BioMind AI Academy.

← All tools

🎯 Diabetes Risk Score

Seven screening questions in the ADA/CDC style. This is an educational screening — not a diagnosis — and your official score is calculated by the official ADA test, which includes a height-and-weight scoring chart.

1. Age

2. Sex assigned at birth

3. If female: history of gestational diabetes

4. Family history of diabetes (parent or sibling)

5. Ever told you have high blood pressure

6. Physical activity

7. Weight category

How it works: the ADA risk test scores age, sex, gestational-diabetes history, family history, blood pressure, activity, and a height/weight chart. Because the weight points need that official chart, BioMind does not invent a score here — your answers are reviewed, and the official test gives the validated score. Source: American Diabetes Association.

📚 Learn more: diabetes lessons at the BioMind AI Academy.

← All tools

🫀 Heart Risk (10-Year) — AHA PREVENT

The American Heart Association's current PREVENT model estimates 10-year cardiovascular risk for adults aged 30–79 without known cardiovascular disease. It uses age, sex, systolic blood pressure, cholesterol, BMI, kidney function (eGFR), diabetes, smoking, and blood-pressure and cholesterol medicines.

Why an official link? A validated percentage requires the official PREVENT equations and clinical inputs — so BioMind sends you to the AHA's own calculator instead of showing an estimated number that was not properly calculated.

Open the official AHA PREVENT calculator ↗

Source: American Heart Association — PREVENT risk equations and calculator (professional.heart.org). Educational information only; interpreting a risk estimate is a conversation with your own clinician.

📚 Learn more: heart-health lessons at the BioMind AI Academy.

← All tools

🩸 A1C ↔ Average Glucose (eAG)

A1C shows your average blood sugar over about 3 months. Convert between A1C (%) and estimated average glucose.

I know my…

A1C (%)

How it works: eAG (mg/dL) = 28.7 × A1C − 46.7; eAG (mmol/L) = 1.59 × A1C − 2.59. Ranges (ADA): A1C below 5.7% is normal · 5.7–6.4% prediabetes · 6.5% and above is in the diabetes range. Source: American Diabetes Association (ADAG study).

📚 Learn more: Dr. Mariam's book and lessons on diabetes at the BioMind AI Academy.

← All tools

🍬 Blood Sugar Converter — and What the Number Means

Convert a blood sugar (glucose) result between mg/dL and mmol/L, and see where it falls.

Glucose value

Unit

When was it measured?

How it works: mmol/L = mg/dL × 0.0555. Reference ranges (ADA): fasting — normal 70–99 · prediabetes 100–125 · diabetes range 126+ mg/dL; two hours after meals — normal below 140 · prediabetes 140–199 · diabetes range 200+. A diagnosis always needs a repeat laboratory test, not a single reading. Source: American Diabetes Association, Standards of Care.

📚 Learn more: the academy's lessons on diabetes and metabolism.

← All tools

📐 Waist-to-Height Ratio

One simple check: your waist should measure less than half your height. Enter both measurements to see where your ratio falls on the standard chart. Educational only — not a diagnosis.

Waist (at the navel, relaxed)

Height

Measured in

The standard chart (Ashwell boundary values): below 0.40 — below the usual healthy range · 0.40–0.49 — healthy range · 0.50–0.59 — increased range · 0.60 and above — high range. The simple public-health message behind it: keep your waist to less than half your height. Sources: Ashwell & Gibson, BMJ Open 2016; UK NICE guidance on waist-to-height ratio.

📚 Learn more: healthy-weight lessons at the BioMind AI Academy.

← All tools

🫘 eGFR — Kidney Function Estimate

The CKD-EPI 2021 equation — the current standard, without race — estimates how well the kidneys filter blood, from a creatinine blood test. Educational only: a single estimate is not a diagnosis.

Creatinine (from your blood test)

Creatinine unit

Age (years)

Sex

How it works: eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.200 × 0.9938^age × 1.012 if female (κ = 0.7 female / 0.9 male; α = −0.241 female / −0.302 male). The standard KDIGO G-categories: G1 — 90 and above · G2 — 60–89 · G3a — 45–59 · G3b — 30–44 · G4 — 15–29 · G5 — below 15. Kidney health is judged from eGFR that persists over at least 3 months, together with urine tests — never from one number alone. Sources: Inker et al., New England Journal of Medicine 2021 (CKD-EPI 2021); KDIGO 2024 CKD guideline.

📚 Learn more: kidney and body-systems lessons at the BioMind Human Body Explorer.

← All tools

🧪 Creatinine Clearance (Cockcroft–Gault)

The classic 1976 estimate, still used every day to adjust medicine doses for the kidneys. It estimates clearance from creatinine, age, weight and sex. Educational only.

Creatinine (from your blood test)

Creatinine unit

Age (years)

Weight

Weight unit

Sex

How it works: CrCl = ((140 − age) × weight in kg ÷ (72 × creatinine in mg/dL)) × 0.85 if female. It is an estimate — it can read higher than true filtration, especially with obesity or low muscle mass, and modern labs usually report eGFR (CKD-EPI) alongside. Clinicians compare either number with the reference range printed on the lab report. Source: Cockcroft & Gault, Nephron 1976.

📚 Learn more: kidney and body-systems lessons at the BioMind Human Body Explorer.

← All tools

🤰 Due Date & Gestational Age

Naegele's rule: the estimated due date is 280 days (40 weeks) from the first day of your last period. Only about 1 in 20 babies arrives exactly on it — it is a guide for planning, and your care team may adjust it after an ultrasound.

First day of last period (LMP)

How it works: due date = LMP + 280 days; gestational age counts from the same first day of the last period. Dating by an early ultrasound is more precise and may replace this estimate. Source: ACOG guidance on estimating the due date (Naegele's rule).

📚 Learn more: health lessons at the BioMind AI Academy.

← All tools

⚖️ Pregnancy Weight Gain Guide

The Institute of Medicine (IOM) recommended total weight gain depends on your BMI before pregnancy. Enter your height and your pre-pregnancy weight to see your range. Educational only — your own care team guides your pregnancy.

Height

Height unit

Weight before pregnancy

Weight unit

The IOM 2009 ranges (single baby): starting BMI below 18.5 — gain 12.5–18 kg (28–40 lb) · BMI 18.5–24.9 — 11.5–16 kg (25–35 lb) · BMI 25–29.9 — 7–11.5 kg (15–25 lb) · BMI 30 and above — 5–9 kg (11–20 lb). Recommended weekly gain in the 2nd and 3rd trimesters is roughly 0.51, 0.42, 0.28 and 0.22 kg/week (about 1.0, 1.0, 0.6 and 0.5 lb/week) for the same four groups. Twins have higher ranges. Sources: Institute of Medicine / National Research Council 2009; ACOG Committee Opinion 548.

📚 Learn more: healthy-eating lessons at the BioMind Life.

Smart Tools for Health & Science

📏 Universal Measurement Converter

⚖️ BMI & Healthy Weight Range

🔥 Calorie & Protein Needs

💧 Daily Water Intake

❤️ Blood Pressure Checker

🎯 Diabetes Risk Score

🫀 Heart Risk (10-Year) — AHA PREVENT

🩸 A1C ↔ Average Glucose (eAG)

🍬 Blood Sugar Converter — and What the Number Means

📐 Waist-to-Height Ratio

🫘 eGFR — Kidney Function Estimate

🧪 Creatinine Clearance (Cockcroft–Gault)

🤰 Due Date & Gestational Age

⚖️ Pregnancy Weight Gain Guide