How to use these tools
Pick one goal first, such as weight, calories, or training load.
Use stable inputs. Measure at the same time each day when possible.
Treat outputs as guides, not medical diagnosis.
For health decisions, confirm with a qualified professional.
Featured
- BMI calculator (kg/cm) – BMI & WHO category.
Enter weight (kg) and height (cm) to get your BMI and WHO category instantly. Copy a shareable result link.
- BMR & TDEE Calculator | Daily Calorie Targets.
Calculate BMR, TDEE and daily calorie needs using age, sex, height, weight and activity level.
- Ideal weight calculator – Devine, Hamwi and BMI ranges.
Estimate ideal body weight with the Devine, Hamwi, Robinson and Miller formulas, set a custom BMI goal, and compare.
- Body Fat Percentage Calculator | US Navy & BMI.
Estimate body fat percentage with the US Navy circumference method or BMI (Deurenberg).
- Due Date Calculator (LMP, IVF, Ultrasound).
Estimate your pregnancy due date and current gestational age from LMP, conception, IVF transfer, or ultrasound date.
Life & health
- 1RM (One-Rep Max) & Training Weight Calculator.
Estimate your 1RM from weight and reps using common formulas, then convert to training weights by %1RM or target reps.
- Calorie & Weight-loss Planner | TDEE, Targets.
Estimate your TDEE, set a calorie target to reach your goal weight by a chosen date, or see how long it may take.
- Calorie Deficit Calculator | Daily gap and weekly.
Compare maintenance calories and target intake, then estimate daily calorie deficit, weekly deficit, and rough weekly.
- Calorie Surplus Calculator.
Compare maintenance calories and target intake, then estimate daily calorie surplus, weekly surplus, and rough weekly.
- Carb Drink Mix Planner | Turn bottle carb targets into.
Turn a per-bottle carb target into practical scoop or serving counts, then check rounded bottle carbs, total carbs.
- Dehydration Percent Calculator.
Compare a known session-loss estimate against starting body weight and see the percentage body-mass change before you.
- Electrolyte Bottle Plan | Split sodium across bottles and.
Turn session fluid and sodium targets into a bottle-by-bottle electrolyte plan.
- Electrolyte Drink Mix.
Turn one bottle sodium target into tablets, scoops, or serving fractions.
- Electrolyte Needs Calculator.
Check whether a workout context still looks like plain-water territory or if electrolyte support deserves more.
- Gel Carb Schedule | Turn hourly carb targets into gel timing.
Turn a per-hour carb target into gel timing, serving fractions, and checkpoint-by-checkpoint carb totals.
- Health & fitness calculators — BMI, calories, body fat.
Estimate BMI, body fat %, calories, macro targets, ideal weight, heart rate zones, and due dates.
- Heart Rate Zone Calculator.
Find your training heart rate zones in bpm using %HRmax, Karvonen (HRR), or %LTHR.
- Hydration Bottle Plan | Bottles and refills for one session.
Turn one during-workout drink target into a practical bottle and refill plan.
- Hydration Schedule Calculator | Split daily water across.
Split one daily water target across wake-up, daytime, training, or hot-weather slots, then copy a simple hydration.
- Macro Calculator | Daily protein, carbs, and fat grams.
Turn daily calories and macro ratios into grams of protein, carbs, and fat.
- Macro Per Meal Calculator.
Split daily protein, carbs, and fat grams across 3 meals, 4 meals, or 3 meals plus a snack, then copy a simple.
- Meal Calorie Split Calculator | Divide daily calories.
Split a daily calorie target across 3 meals, 4 meals, or 3 meals plus a snack, then copy the meal-by-meal kcal plan.
- Pre-Workout Hydration Plan | Split water before training.
Turn body weight, start time, and session context into a simple pre-workout hydration plan, then split mL across drink.
- Protein Intake Calculator | Grams per day by body weight.
Estimate a daily protein intake range from body weight and goal, with quick g/kg guidance for general intake.
- Protein Per Meal Calculator | Split daily protein across meals.
Split a daily protein target across 3 meals, 4 meals, or 3 meals plus a snack, then copy the meal-by-meal gram plan.
- Rehydration Plan Calculator.
Turn a workout fluid-loss estimate into a simple post-workout rehydration plan, then split liters and mL across.
- Running Pace, Time and Distance Calculator.
Solve running pace, time, or distance from the other two.
- Sleep Cycle Calculator | Bedtime & Wake-up Times.
Find suggested bedtimes or wake-up times using sleep cycles and a fall-asleep buffer.
- Sodium Loss Estimator | Estimate sodium range from sweat rate.
Estimate a rough sodium-loss range from sweat rate, session length, heat, and sweat saltiness.
- Sweat Rate Calculator | Estimate workout fluid loss per hour.
Estimate session fluid loss and sweat rate from pre/post workout weight, session duration, and drinks consumed, then.
- Water Intake Calculator.
Estimate a daily water intake baseline from body weight, activity level, and climate, then review liters, mL, fl oz.
- Workout Hydration Plan Calculator.
Turn a known session-loss estimate into simple drink checkpoints during a workout, then see how much fluid may still.
Choose the right life and health tool
Open one tool based on the decision you need next: body metrics, calorie planning, pregnancy timing, or training pace. This directory works best as a routing layer before you commit to one calculator.
Best first choices
- Start with BMI, ideal weight, or body fat when the question is body composition or screening.
- Open calorie, BMR/TDEE, or heart-rate tools when the question is intake, pacing, or training load.
- Use due date when the timeline itself is the goal rather than a general date calculation.
FAQ
Which calculator should I open first?
Choose the page that matches the output you need next: BMI for screening, calorie planner for intake targets, due date for pregnancy timing, and heart-rate or 1RM tools for training decisions.
Should I compare several health tools at once?
No. Start with one tool and one question, then move to a related calculator only if you need a different type of answer such as composition, calories, or schedule timing.
Are these tools medical advice?
No. They are browser-based estimates and planning aids. Use them to prepare questions or compare scenarios, then confirm anything important with qualified professionals.
Related topics
- Health & fitness calculators — BMI, calories, body fat | CalcBEBrowse the main hub for body metrics, calorie planning, heart-rate tools, and due-date planning in one place.
- 1RM (One-Rep Max) & Training Weight Calculator | CalcBEOpen this when the next decision is training load, not calories or body composition.
- Calorie & Weight-loss Planner | TDEE, Targets | CalcBEUse this when you already know the goal and need a calorie target with a projected timeline.
- Due Date Calculator (LMP, IVF, Ultrasound) | CalcBEOpen this when the next question is pregnancy dating rather than body metrics.