Health calculators

Free health calculators for BMI, calories, TDEE and macros

Get instant, private health estimates without creating an account or uploading personal data. Calculate your Body Mass Index against WHO categories, estimate your total daily energy expenditure, set calorie and macro targets for weight loss or lean gain, and review healthy weight ranges, all in your browser. These tools are for informed self-education, not medical diagnosis.

Calorie Calculator Estimate daily calories, TDEE, goal targets and macros for weight loss, maintenance or lean gain. BMI Calculator Calculate your Body Mass Index instantly with WHO categories, visual gauge, and health insights. Due Date Calculator Calculate your pregnancy due date from LMP, conception date or IVF transfer. See all 3 trimesters and key milestones. Ovulation Calculator Predict your ovulation date, fertile window and next period for 3 cycles ahead with a visual calendar. Sleep Calculator Find the best bedtime or wake-up time based on 90-minute sleep cycles. Wake refreshed, not groggy.

Health estimates based on clinical standards

BMI and calorie estimates are widely used in clinical and public health settings as starting points for understanding body composition and energy balance. Seeing these numbers together, alongside healthy weight ranges and projected timelines, gives more context than a single figure alone.

Body weight and nutrition targets

BMI thresholds follow World Health Organization categories: underweight, normal, overweight and obese. Daily calorie calculations account for age, sex, height, weight and activity level, using the most widely validated formula for adults applied in dietitian practice worldwide. Protein, fat and carb targets give a practical starting point for weight loss, maintenance or lean muscle gain.

Pregnancy and cycle planning

Due dates are commonly calculated from the first day of the last menstrual period, but can also be based on conception date or IVF transfer, each method gives a slightly different result. Knowing the expected date for each trimester milestone helps with medical appointments, travel and preparation. Ovulation and fertile window estimates are useful reference points for family planning.

These results are estimates, not medical advice

BMI is a population-level screening index that does not account for muscle mass, body fat distribution, age or individual health history. Calorie needs vary with sleep quality, hormonal factors, medication and training specifics. Results here are for informed self-education. For clinical weight management, pregnancy care or any medical concern, consult a qualified healthcare professional.

Your health data stays on your device

Weight, height, age and other inputs are processed entirely in your browser. Nothing is transmitted to PureTools or any server. Inputs are stored in your browser's session memory and erased automatically when you close the tab.