Life & health calculators

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.

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.
• Aid Station Fueling Plan
  Turn fluid, sodium, drink-carb, and gel targets into station actions with refill timing and carry limits.
• Calorie & Weight-loss Planner
  Estimate your TDEE, set a calorie target to reach your goal weight by a chosen date, or see how long it may take at your current intake.
• Calorie Deficit Calculator
  Compare maintenance calories and target intake, then estimate daily calorie deficit, weekly deficit, and rough weekly weight change in kg and lb.
• Calorie Surplus Calculator
  Compare maintenance calories and target intake, then estimate daily calorie surplus, weekly surplus, and rough weekly weight gain in kg and lb.
• Calories Burned Calculator
  Estimate calories burned from body weight, activity MET, and minutes.
• Carb Drink Mix Planner
  Turn a per-bottle carb target into practical scoop or serving counts, then check rounded bottle carbs, total carbs, carb density, and the implied grams per hour.
• Comeback Week Schedule
  Turn recovery and return-to-training signals into a seven-day comeback week for session length, rest days, cross-training, and long-session timing.
• Crew Handoff Fueling Plan
  Turn crew-access timing into checkpoint handoff lists for bottles, mix, gels, and electrolyte backup.
• Dehydration Percent Calculator
  Compare a known session-loss estimate against starting body weight and see the percentage body-mass change before you move into rehydration planning.
• Drop Bag Fueling Plan
  Plan drop-bag placement by checkpoint with reserve bottles, mix, gels, tabs, and late-course backup.
• Electrolyte Bottle Plan
  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 attention before you finalize rehydration.
• Gel Carb Schedule
  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 (Karvonen, HRR, Max HR)
  Find your training heart rate zones in bpm using %HRmax, Karvonen (HRR), or %LTHR.
• Hydration Bottle Plan
  Turn one during-workout drink target into a practical bottle and refill plan.
• Hydration Schedule Calculator
  Split one daily water target across wake-up, daytime, training, or hot-weather slots, then copy a simple hydration schedule in liters and mL.
• Macro Calculator
  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 macro-by-meal plan.
• Meal Calorie Split Calculator
  Split a daily calorie target across 3 meals, 4 meals, or 3 meals plus a snack, then copy the meal-by-meal kcal plan.
• Multi-Day Recovery Plan
  Turn the finish-to-breakfast recovery story into a day 1 to day 3 plan for fluid, carbs, protein, easy movement, and return-to-training timing.
• Next-Day Recovery Plan
  Turn the remaining evening fluid loss into a next-day recovery note that covers dinner, pre-bed support, breakfast, and the next-morning top-up.
• Pet Age Calculator
  Estimate dog or cat age in human years and life stage from species, age, and dog size.
• Post-Race Refuel Plan
  Turn finish-line fluid loss and body mass into a first-30-minute, first-hour, and first-meal refuel note for drink, carbs, protein, and sodium.
• Pre-Workout Hydration Plan
  Turn body weight, start time, and session context into a simple pre-workout hydration plan, then split mL across drink windows before training begins.
• Protein Intake Calculator
  Estimate a daily protein intake range from body weight and goal, with quick g/kg guidance for general intake, training, muscle gain, and dieting.
• Protein Per Meal Calculator
  Split a daily protein target across 3 meals, 4 meals, or 3 meals plus a snack, then copy the meal-by-meal gram plan.
• Race Fueling Pack List
  Turn race duration, bottle capacity, mix, gels, and backup margin into a simple pack list after your aid-station plan already looks believable.
• Rehydration Plan Calculator
  Turn a workout fluid-loss estimate into a simple post-workout rehydration plan, then split liters and mL across immediate and short follow-up windows in your browser.
• Return to Training Check
  Turn recovery signals into a simple return-to-training check for easy, reduced, or delayed training after a hard session or race.
• Running Pace, Time and Distance Calculator
  Solve running pace, time, or distance from the other two. Race presets (5K, 10K, half, marathon) with min/km or min/mile plus km/h speeds and lap splits.
• Session Fueling Plan
  Combine fluid, sodium, drink-carb, and gel targets into one checkpoint plan for a workout or race.
• Sleep Cycle Calculator
  Find suggested bedtimes or wake-up times using sleep cycles and a fall-asleep buffer.
• Sodium Loss Estimator
  Estimate a rough sodium-loss range from sweat rate, session length, heat, and sweat saltiness.
• Steps to Calories & Distance Calculator
  Convert steps into distance (km/mi), walking time, and calories burned using height, weight, pace, grade, and terrain.
• Sweat Rate Calculator
  Estimate session fluid loss and sweat rate from pre/post workout weight, session duration, and drinks consumed, then review liters per hour in your browser.
• Training Load Rebuild
  Plan weeks 2 to 4 after return-to-training with a weekly volume cap, long-session ceiling, and deload trigger.
• Training Ramp Plan
  Turn return-to-training readiness into a short ramp plan for first-session duration, week-volume cap, and long-session timing after recovery.
• Water Intake Calculator
  Estimate a daily water intake baseline from body weight, activity level, and climate, then review liters, mL, fl oz, and cups in your browser.
• Workout Hydration Plan Calculator
  Turn a known session-loss estimate into simple drink checkpoints during a workout, then see how much fluid may still be left for post-session recovery.

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

Related topics

• Health & fitness calculators — BMI, calories, body fat | CalcBE
  Browse 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 | CalcBE
  Open this when the next decision is training load, not calories or body composition.
• Calorie & Weight-loss Planner | TDEE, Targets | CalcBE
  Use this when you already know the goal and need a calorie target with a projected timeline.
• Due Date Calculator (LMP, IVF, Ultrasound) | CalcBE
  Open this when the next question is pregnancy dating rather than body metrics.