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Health Tools

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Simple, private calculators for the numbers that matter: weight, calories, fat, water and sleep. Every tool runs in your browser and shows the formula behind the result.

BMI CalculatorBMI, healthy weight range and sleep check in one stepBody Fat CalculatorUS Navy tape method with fat mass and lean massIdeal Weight CalculatorDevine, Robinson, Miller and Hamwi formulas comparedFood Calorie CalculatorAdd what you eat and see your daily calorie totalFast Food Calorie CalculatorBurgers, fries, pizza, chicken and drinks totalled upMacro and Fat CalculatorProtein, carbs, healthy fat and saturated fat limitsCalorie CalculatorDaily calories for your goalWater Intake CalculatorHow much water you need each dayHeart Rate CalculatorTraining zones and resting heart rateMeal Timing CalculatorWhen to eat before bedGrooming Schedule CalculatorNext haircut, nail cut and beard trim datesWeight Goal Date CalculatorHow long to reach your goal weight, with calorie targetHRV CalculatorHeart rate variability against your own baselineBlood Oxygen (SpO2) CheckerWhat your SpO2 reading means, awake or asleepDaily Health and Fitness Habits12 habits scored out of 100 with your top three fixesBest Sleep Habits10 evidence based habits with a personal score
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Why health and sleep belong together

Sleep sets the pace for appetite, mood, training and recovery. When you sleep less than you need, hunger hormones rise and willpower falls, so food choices get worse. That is why this site pairs every health tool with sleep guidance. Start with the bedtime calculator, then use these tools to track the rest of your day.

Where to start

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Frequently asked questions

Are these calculators free?

Yes. All tools are free, need no sign up and run in your browser.

Is my information stored?

No. Numbers you type stay on your device.

Can these tools replace a doctor?

No. They give estimates for education. Speak with a doctor or dietitian about medical decisions.

Medical references: for evidence based health information see CDC Sleep and Sleep Disorders, NIH NHLBI on Sleep Deprivation, American Academy of Sleep Medicine Sleep Education and MedlinePlus. This page is general information, not medical advice.