HbA1c Converter: A1C Percent to mmol/mol
Convert HbA1c between A1C percentage and IFCC mmol/mol using the NGSP master equation. See a quick chart, reporting differences and when to ask about a result.
A1C to eAG Calculator: Convert A1C to Average Blood Sugar
Convert A1C to estimated average glucose (eAG) in mg/dL and mmol/L, or work backwards. See the formula, a quick chart, limits and questions to take to care.
Waist-to-Height Ratio Calculator: Measure Your Waist Against Your Height
Use this waist-to-height ratio calculator for adults. Enter waist and height in cm or inches, see your ratio, measurement steps, limits and next steps.
Blood Sugar Converter: mg/dL to mmol/L
Convert blood glucose from mg/dL to mmol/L or back. Use the two-way calculator, quick conversion table, and tips for recording a result accurately.
BMI Calculator for Adults: Calculate Your Body Mass Index
Use this adult BMI calculator with metric or US units. See your BMI category, the formula, limits of BMI, and when a clinician can help.
Persistent Cough: When to Seek Care, What to Track, and What a Clinician May Check
A persistent cough can have many causes. Learn when it needs urgent care, what patterns to track, and what a clinician may check.
Dizziness When Standing Up: What It Can Mean, When to Seek Care, and What to Track
Dizziness when standing up can have many causes. Learn warning signs, safe next steps, what to track, and how clinicians check postural changes.
Blood in Stool: Bright Red vs Black, When It Is an Emergency, and What to Track
Blood in stool has many causes. Learn what bright red, dark red and black tarry stool can mean, when bleeding is an emergency, and what to tell a clinician.
Shortness of Breath: When It Is an Emergency, What to Track, and What a Clinician May Check
Shortness of breath can have many causes. Learn emergency warning signs, when to seek prompt care, what patterns to note, and what a clinician may check.
Leg Swelling: One Leg vs Both, When to Seek Care, and What to Track
Leg swelling can have many causes. Learn why sudden swelling in one leg needs prompt care, what to track, and when breathing symptoms are an emergency.
Unexplained Weight Loss: What to Track, When to Seek Care, and What May Be Checked
Unexplained weight loss can have many causes. Learn what counts as significant, what to record, when to seek urgent care and what a clinician may check.
Breast Lump: What to Do Next, How It Is Checked, and When to Seek Care
Found a breast lump or new breast change? Learn what to do next, how clinicians assess it, when to seek prompt care and why most lumps are not cancer.
Swollen Lymph Nodes: What the Location Can Suggest, What to Watch, and When to Seek Care
A swollen lymph node is often linked to an infection nearby, but the full pattern matters. Learn what to note, when a short period of observation is reasonable and which symptoms need prompt care.
Waking Up to Pee at Night: What Nocturia Can Mean, What to Track, and When to Seek Care
Waking to pee can disturb sleep for many reasons. Learn what nocturia can mean, what to track for a clinician, practical steps that are safe to try and symptoms that need prompt care.
Ferritin Blood Test: Do You Need to Fast, What to Tell the Lab, and How to Read the Result Safely
Preparing for a ferritin blood test? Learn when fasting may matter, what supplements and symptoms to mention, why results need context and what to ask next.