Free calculators for A1C, blood pressure, cholesterol, kidney function and other lab results, plus sleep and lifestyle tools. Each one shows its formula and sources, and nothing you enter is stored.
Health and Lab
Heart and Blood Pressure
Blood Pressure Category Calculator
Use this blood pressure category calculator to see which category your systolic and diastolic readings fall into under US or European guidelines.
Cholesterol Calculator
Use this cholesterol calculator to find your LDL cholesterol and total-to-HDL ratio from a standard lipid panel.
Triglyceride-to-HDL Ratio Calculator
Use this triglyceride-to-HDL ratio calculator to calculate your TG/HDL-C ratio from your lipid panel results.
Cardiac Output Calculator
Use this cardiac output calculator to find your cardiac output and cardiac index from heart rate and stroke volume.
Mean Arterial Pressure (MAP) Calculator
Use this mean arterial pressure calculator to find your average blood pressure across a full heartbeat cycle from systolic and diastolic readings.
Pulse Pressure Calculator
Use this pulse pressure calculator to find the gap between your systolic and diastolic blood pressure readings.
Heart Age Calculator
Use this heart age calculator to compare the age of your heart and blood vessels with your real age, using the Framingham equations with cholesterol or BMI.
Heart Disease Risk Calculator
Use this heart disease risk calculator to estimate your 10-year and 30-year risk of heart attack, stroke and heart failure with the AHA PREVENT equations.
Blood Sugar and Lab Results
eAG/A1C Calculator
Use this A1C calculator to convert between A1C and estimated average glucose (eAG) in either direction.
GFR Calculator
Use this GFR calculator to estimate your kidney function from creatinine, age, and sex using the current CKD-EPI equation.
Anion Gap Calculator
Use this anion gap calculator to find your serum anion gap from basic metabolic panel values, a screening step for metabolic acidosis.
Corrected Calcium Calculator
Use this corrected calcium calculator to adjust your measured calcium for low albumin, which skews true calcium status low.
Creatinine Clearance Calculator (Cockcroft-Gault)
Use this creatinine clearance calculator to estimate your kidney function using the Cockcroft-Gault equation.
FIB-4 Calculator
Use this FIB-4 calculator to turn your age, AST, ALT and platelet count into a FIB-4 score and see what your liver fibrosis risk band means.
Free Testosterone Calculator
Use this free testosterone calculator to estimate your free and bioavailable testosterone from total testosterone, SHBG, and albumin.
HOMA-IR Calculator
Use this HOMA-IR calculator to turn your fasting glucose and fasting insulin into a HOMA-IR score and see where it sits among published research values.
AST ALT Ratio Calculator
Use this AST ALT ratio calculator to divide your AST by your ALT, get your De Ritis ratio, and see what the pattern can and cannot tell you.
BUN Creatinine Ratio Calculator
Use this BUN creatinine ratio calculator to divide your BUN by your creatinine, in US or SI units, and see what the ratio can and cannot tell you.
Diabetes Risk Calculator
Use this diabetes risk calculator to score your risk of prediabetes or type 2 diabetes with the 7-question ADA and CDC risk test.
Transferrin Saturation Calculator
Use this transferrin saturation calculator to work out your TSAT from serum iron and TIBC, UIBC or transferrin, in US or SI units.
Lifestyle and Longevity
Sleep Calculator
Use this sleep calculator to find bedtimes or wake-up times based on sleep cycles and how long it takes you to fall asleep.
Blood Alcohol Content (BAC) Calculator
Use this blood alcohol content calculator to estimate your approximate BAC from drinks consumed, body weight, and time elapsed.
Life Expectancy Calculator
Use this life expectancy calculator to estimate your remaining life expectancy using Social Security actuarial data.
Biological Age Calculator
Use this biological age calculator to estimate a lifestyle-risk wellness age from your smoking, activity, sleep, and diet habits.
Blood Type Calculator
Use this blood type calculator to see the possible ABO and Rh blood types a child could inherit from two parents.
Jet Lag Recovery Calculator
Use this jet lag recovery calculator to estimate how many days your body clock needs to adjust, and when to seek or avoid light.
Metabolic Age Calculator
Use this metabolic age calculator to compare your BMR to typical values for other ages, the same metric used on smart scales.
Pack Years Calculator
Use this pack years calculator to find your smoking pack-year total and check it against lung cancer screening guidelines.
Peak Flow Calculator
Use this peak flow calculator to find your predicted peak flow from your sex, age and height, and see your asthma zones from your personal best.
Sleep Debt Calculator
Use this sleep debt calculator to add up how much sleep you missed over the last 7 nights, compared with the sleep you need.
6 Minute Walk Test Calculator
Use this 6 minute walk test calculator to compare your walk distance with the predicted normal for a healthy adult of your sex, age, height and weight.
Breast Cancer Risk Calculator
Use this breast cancer risk calculator to estimate your 5-year and lifetime chance of invasive breast cancer with the NCI Gail model.
Cancer Risk Calculator
Use this cancer risk calculator to check your lifestyle risk factors for cancer one by one and see which cancer screenings fit your age.
Hair Growth Calculator
Use this hair growth calculator to see how long your hair will take to reach a target length, with or without regular trims.
Lung Cancer Risk Calculator
Use this lung cancer risk calculator to estimate your chance of a lung cancer diagnosis in the next 6 years if you smoke now or used to smoke.
Ovarian Cancer Risk Calculator
Use this ovarian cancer risk calculator to check your family history for inherited risk and, from age 50, estimate your 10 year risk.
Prostate Cancer Risk Calculator
Use this prostate cancer risk calculator to estimate your chance of no cancer, low-grade or high-grade cancer on a biopsy, from your PSA and risk factors.
Weighted Blanket Calculator
Use this weighted blanket calculator to find a blanket weight for your body weight, rounded down to a standard size you can buy.
Contact Lens Conversion Calculator
Use this contact lens conversion calculator to estimate the contact lens power that matches your glasses prescription, adjusted for vertex distance.
Reading Glasses Calculator
Use this reading glasses calculator to estimate the over-the-counter reader strength you may need, based on your age and reading distance.
Osteoporosis Risk Calculator
Use this osteoporosis risk calculator to estimate your chance of low bone density from your age and weight, using the validated OST score.
Vital Capacity Calculator
Use this vital capacity calculator to find your predicted forced vital capacity (FVC), lower limit of normal and percent predicted from age, sex and height.