Medical Tools and Calculators

By GHKH TeamLast updated 2026-10-11

Our free medical tools and calculators help you understand everyday health numbers. Use the BMI calculator to see your weight category, the blood pressure tracker to log readings against the normal 120/80 target, the symptom checker to learn which departments and conditions relate to your symptoms, and the heart rate calculator to check whether your resting pulse falls in the normal 60-100 BPM range (72 BPM is typical).

Private by Design

All tools run in your browser with no account and no server. The blood pressure tracker saves readings only on your own device. Nothing is sent to ghkh.site.

All Tools

🔎Symptom CheckerSelect your symptoms to see related body systems, departments, red flags and condition guides. Educational, not a diagnosis.Open the free symptom checker ⚖️BMI CalculatorCalculate body mass index with WHO categories plus Asian cut-offs. Works in metric or imperial units.Open the free bmi calculator 🩺Blood Pressure TrackerLog readings privately in your browser, see AHA categories and a trend chart, and export to CSV.Open the free blood pressure tracker ❤️Heart Rate CalculatorCheck resting heart rate against the normal 60-100 BPM range and estimate exercise heart rate zones.Open the free heart rate calculator 🚑Emergency First AidCPR, choking, bleeding, stroke FAST and heart attack steps, plus emergency numbers by country.Open the free emergency first aid

How to Get the Most From These Tools

Measure at the same time of day, use validated devices such as an upper-arm blood pressure cuff, and keep a simple log to show your doctor. One unusual number rarely means much on its own; patterns over days and weeks are more useful. If a result is far outside the normal range or comes with symptoms, act on the red-flag advice shown in the tool.

Educational, Not Diagnostic

These tools are not medical devices and cannot diagnose disease. They use public reference values from WHO, the American Heart Association and CDC. If results worry you, talk to a clinician. More tools will be added after testing. Read the medical disclaimer.

Recommended Home Health Tools

Affiliate disclosure: As an Amazon Associate, ghkh.site earns from qualifying purchases. This does not change the price you pay or our editorial choices. Links go to Amazon.com search results; we do not list prices or ratings because they change often. Devices support home monitoring and do not replace a doctor.

🩺Upper-arm blood pressure monitorChoose an upper-arm cuff (not wrist) that is clinically validated, with the right cuff size for your arm.Check options on Amazon ›🫧Fingertip pulse oximeterShows SpO2 and pulse. Readings can be less accurate with cold fingers, nail polish or darker skin tones.Check options on Amazon ›⌚Heart rate chest strap or fitness trackerChest straps are usually more accurate than wrist sensors during exercise; wrist trackers are fine for resting heart rate trends.Check options on Amazon ›🌡️Digital thermometerA simple digital oral/underarm or ear thermometer is reliable for home fever checks.Check options on Amazon ›⚖️Digital bathroom scaleA stable scale with clear display helps track weight and BMI over time.Check options on Amazon ›🩸Blood glucose meter kitAsk your clinician which meter fits your test strips and insurance or budget.Check options on Amazon ›🚑Home first aid kitLook for gauze, bandages, gloves, antiseptic wipes and scissors.Check options on Amazon ›