43 tools · Health & Fitness
Health & Fitness tools
Quick calculators and plain-English habit guides.
Popular in health & fitness
Health & Fitness
BMI Calculator
Input your height and weight to see your BMI score and health category online. Understand your result in plain English with this free calculator.
Health & Fitness
Calorie Calculator
Estimate your daily calorie needs based on age, activity, and goals like lose, maintain, or gain instantly online. Use this free and private tool in your browser with no registration.
Health & Fitness
Daily Water Intake Calculator
Calculate how much water you should drink per day based on weight, activity, and climate. Liters and ounces.
Health & Fitness
Ideal Weight Calculator
Calculate your ideal weight using Devine, Robinson, and Miller formulas for honest, no-fad ranges. This free online tool provides instant results with no registration.
Health & Fitness
Running Pace Calculator
Calculate pace, finish time, or distance for any run in km or miles. Perfect for 5K to marathon training, with free, instant results and no sign-up.
Health & Fitness
Macro Calculator
Get your daily protein, carb, and fat targets based on calories and goals. This free, instant macro calculator works online with no signup required.
More health & fitness tools
- BMR CalculatorEstimate your basal metabolic rate with the Mifflin-St Jeor formula online for free. Calculate calories burned at rest instantly in your browser without signup.
- Body Fat CalculatorEstimate body fat percentage using the U.S. Navy tape method for free in your browser. Enter waist, neck, and hip measurements to get instant results without signup.
- Pregnancy CalculatorEstimate your due date, current week, and trimester from your last period. Instantly get private results in your browser with no sign-up needed.
- Ovulation CalculatorFind your estimated ovulation date and fertile window from the last period and cycle length. Free, private, 100% in-browser.
- Steps to Calories CalculatorConvert daily walking steps into calories burned using weight, stride, and pace. Free online fitness calculator with instant results — no registration required.
- Smoking Cost CalculatorCalculate monthly, yearly, 10‑year, and lifetime smoking costs based on packs per day. Free instant online calculator — a gut check to help you quit, no sign‑up.
- Alcohol Unit CalculatorConvert any drink to standard drinks (US) or units (UK). Track a week's intake against low-risk guidelines.
- Caffeine Intake CalculatorLog coffee, tea, soda, and energy drinks to see your total daily caffeine in mg instantly online. Compare against the 400 mg safe limit for free in your browser with no registration.
- Sleep Cycle CalculatorCalculate optimal bedtimes and wake‑up times aligned with 90‑minute sleep cycles. Free online tool with instant results — no sign‑up required.
- Heart Rate Zone CalculatorCalculate your max heart rate and five training zones for recovery, aerobic, tempo, threshold, and VO2 max in one go. Free, instant, and no sign-up needed.
- Protein Intake CalculatorFind your optimal daily protein grams based on weight, activity, and goal (cut, maintain, bulk). Get instant free results online with no sign-up.
- Carbohydrate CalculatorCalculate daily carb grams from calories, activity, and diet (balanced, low-carb, keto). Pairs with the macro calculator.
- Fiber Intake CalculatorGet recommended grams and tips for whole foods instantly online. Free nutrition tool works in your browser with no sign-up.
- Fasting TimerStart a free fasting timer showing elapsed, remaining, and eating window for any schedule. No sign-up, works instantly in your browser.
- Meal Prep CalculatorEnter your weekly macros and food preferences to get a portioned shopping list instantly. A free online meal prep calculator that works in seconds with no signup.
- Water Intake by Body WeightCalculate daily water intake from body weight using the half-ounce-per-pound rule plus activity and climate adjustments.
- One-Rep Max CalculatorEstimate your 1RM from any set of reps using the Epley, Brzycki, Lombardi, and Mayhew formulas. A free, no-sign-up tool for serious lifters online.
- Ovulation Window CalculatorCalculate your fertile window, likely ovulation day, and next period from last period date and cycle length. Free, instant, no sign-up needed.
- Electrolyte Replacement CalculatorWater, sodium, and potassium targets for endurance training, tuned to body weight, sweat rate, and climate. Free online calculator, instant, no sign-up.
- Vitamin D Dose CalculatorCalculate your daily vitamin D IU for maintenance or deficiency repletion — accounting for age, weight, and sun exposure. Free online, no sign-up.
- Calories Per Macro EstimatorGet total kcal from protein, carbs, fat, and fiber plus percent breakdown instantly online. Catch low-protein diets quickly with this free tool in your browser without registration.
- Jet Lag Recovery CalculatorEstimate recovery days based on timezones crossed and travel direction — eastward is tougher than west. Free online calculator, instant, no sign-up.
- Vegan Protein CalculatorCalculate your daily plant-based protein target and get meal ideas from tofu, lentils, and quinoa instantly online. Free to use with no registration required.
- Resistance Band Workout PlannerPlan a weekly resistance band split with exercises by goal, days per week, and fitness level — beginner to advanced. Free, instant, no sign-up.
- Biohacking Supplement TrackerTrack your biohacking supplement stack cost monthly and yearly, with interaction cautions and staple callouts. Free, browser-only, no sign-up tool.
- Gym Membership ROI CalculatorAnalyze your cost per visit and break-even point to decide if your gym membership is worth it. Estimate yearly savings instantly with this free, no-sign-up tool.
- Eye Strain Break CalculatorUse a free timer and daily screen-hours planner to prevent digital eye strain. Works instantly in your browser with no sign-up.
- Zone 2 Heart Rate CalculatorFind your optimal zone 2 cardio heart rate online using Karvonen, Maffetone, or max-HR methods. Based on longevity research — free calculator with instant results, no signup.
- VO2 Max EstimatorEstimate your VO2 max online using the Cooper 12-minute run, Rockport walk, or resting heart rate method. Free tool with age and sex norms for instant context.
- Cold Plunge Protocol BuilderBuild a personalized cold plunge protocol by goal and experience level. Get temperature, duration, frequency, and timing instantly with safety notes online.
- Pickleball Rating CalculatorEstimate your pickleball rating from 2.0 to 7.0 DUPR-scale using recent match results and level descriptions. Free, instant online tool with no sign-up needed.
- Step Count Target CalculatorCalculate a daily step target based on age, goal (longevity, weight loss, fitness, athlete), and activity level. Free online calculator gives instant personalized numbers — no sign‑up.
- Run Club Distance CalculatorCalculate distance, pace, and energy burn for run-club sessions by level, target pace, and duration. Includes social run etiquette tips, free and online.
- Sauna Protocol CalculatorBuild a personalized sauna protocol by goal and experience level instantly online. Set rounds, duration, and frequency based on free KIHD longevity data.
- Breathing ExerciseFollow visual breathing pace guides for stress relief, sleep, or focus instantly online. Use box, 4-7-8, and resonant patterns free in your browser with no registration.
- Sleep CalculatorAlign your wake or bedtime to 90-minute sleep cycles so you wake during light sleep instantly online. Use the free calculator based on Hirshkowitz NSF data.
- Calorie Deficit CalculatorCalculate a calorie target for weight loss using BMR, activity level, and pace instantly online. Adjust for slow, moderate, or aggressive deficits for free in your browser with no signup.
Guides about health & fitness
Guide · Health & Fitness
How to Sleep Better
Create 10 sleep habits that improve rest quality without melatonin marketing. Free, instant online guide with no sign-up needed.
Guide · Health & Fitness
How to Drink More Water
Use habit stacks and bottle tricks to drink more water effortlessly. Free instant guide on recognizing your hydration signals in your browser.
Guide · Health & Fitness
Beginner Workout Plan at Home
A 4-week home workout for complete beginners. Bodyweight only, 20-30 minutes, three days a week.
Guide · Health & Fitness
How to Start Running
Start running without hating it. Follow a walk‑run plan to your first 5K in 8 weeks, plus learn injury avoidance tips. Free online guide, no sign‑up required.
Guide · Health & Fitness
How to Lose Belly Fat
Spot-reduction is a myth; rely on calorie deficit, strength, sleep, and stress control. Lose belly fat with our free online plan, no sign-up, in seconds.
Guide · Health & Fitness
Intermittent Fasting for Beginners
16:8 explained simply: what to eat, common mistakes, and who should skip IF entirely. Free online guide with no hype, no sign-up, no diet-app upsell.
Guide · Health & Fitness
How to Eat Healthy on a Budget
Eat well for less with a 10-item staple list, batch cooking tips, and when frozen beats fresh. Free online guide, no sign-up, no meal-plan upsell.
Guide · Health & Fitness
How to Reduce Stress
Manage stress using breathwork, sleep, movement, and the worry window trick free online. Develop calming habits instantly with no download required.
Guide · Health & Fitness
Mindfulness for Beginners
Learn what mindfulness is and isn’t, with a daily micro-practice you can start instantly. A free online guide for beginners that fits into your day in seconds.