Diet & Body Metrics Calculators
Know your body's numbers — macros, hydration, fasting windows and key health markers.
Updated June 2026 · Free · No sign-up
This cluster turns your weight, activity and lab values into practical daily targets and health screens. For everyday nutrition, the Carb Intake and Fat Intake calculators split your calorie goal into macros, the Water Intake calculator sets a hydration target adjusted for body weight, activity and climate (useful in India's hot months), and the Intermittent Fasting calculator builds eating and fasting windows for 16:8, OMAD, 5:2 and other schedules.
Beyond diet, the body-metrics tools double as quick health screens. The Waist-Hip Ratio calculator flags cardiovascular risk using WHO cut-offs, the A1C calculator converts HbA1c to estimated average glucose and a diabetes-risk band, and the eGFR calculator estimates kidney function via the CKD-EPI formula. Abdominal-obesity risk often shows up at lower thresholds in South Asians, so a 'normal' global reading can still warrant attention. These are screening tools only — confirm any abnormal result and treatment with a doctor.
All Diet & Body Metrics Calculators
Carb Intake Calculator
Calculate your daily carbohydrate needs based on calorie goals, activity level, and diet type.
Fat Intake Calculator
Calculate daily fat intake recommendations based on calorie goals and health objectives.
Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity level, and climate.
Intermittent Fasting Calculator
Find the right intermittent fasting schedule for your goals (16:8, 18:6, 20:4, OMAD, 5:2) and calculate fasting/eating windows with calorie targets.
GFR / eGFR Calculator
Estimate Glomerular Filtration Rate (eGFR) to assess kidney function using CKD-EPI formula.
A1C / eAG Calculator
Convert HbA1c percentage to estimated Average Glucose (eAG) and check your diabetes risk category — normal, prediabetes, or diabetes range.
Body Surface Area Calculator
Calculate body surface area (BSA) using DuBois, Mosteller, and Haycock formulas.
Waist-Hip Ratio Calculator
Calculate your waist-to-hip ratio and assess cardiovascular risk according to WHO guidelines.
Body Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) based on measurements.
Height Predictor Calculator
Predict a child's adult height using the mid-parental height formula based on parents' heights.
Sleep Calculator
Calculate the best times to wake up or go to sleep based on sleep cycles.
BAC Calculator
Estimate Blood Alcohol Content (BAC) based on drinks consumed, weight, and time.
Sobriety Date Calculator
Calculate how long you have been sober in years, months, days, and hours from your sobriety date.
Frequently asked questions
How much water should I drink each day?
A common guideline is roughly 30–35 ml of water per kg of body weight, before adjusting for heat, humidity and exercise — all of which raise your needs, which matters during Indian summers. Much of your intake also comes from food and other fluids, not just plain water. Thirst and pale-yellow urine are reasonable everyday signs of adequate hydration; people with kidney or heart conditions should follow their doctor's specific advice.
Why does waist-hip ratio matter more for Indians?
Waist-hip ratio measures fat distribution, and abdominal (central) fat is more strongly linked to heart-disease and diabetes risk than overall weight. South Asians, including Indians, tend to carry more visceral fat at a given BMI, so health risk can appear at lower thresholds than global averages suggest. The WHO flags higher risk at a ratio above about 0.90 for men and 0.85 for women — treat a high reading as a prompt to consult a doctor.
What does my HbA1c (A1C) number mean?
HbA1c reflects your average blood glucose over roughly the past 2–3 months. Common reference bands are below 5.7% as normal, 5.7–6.4% as prediabetes, and 6.5% or above as the diabetes range, and the calculator also converts the percentage to an estimated average glucose. These are screening references — only a doctor can diagnose diabetes, using your full clinical picture and repeat or confirmatory tests.
Can these tools diagnose a kidney or blood-sugar problem?
No. The eGFR and A1C calculators estimate values from the numbers you enter and place them in standard reference ranges, but they do not diagnose any disease. eGFR in particular depends on an accurate, recent serum creatinine reading and other clinical factors. Always take an abnormal or borderline result to a qualified doctor for proper interpretation and follow-up.
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