13 free calculators · no sign-up needed
Your health, calculated clearly.
LifeViora turns the health formulas doctors and dietitians actually use into simple, fast, private calculators — BMI, calories, sleep cycles, ovulation and more.
Quick BMI check
Want more detail? Open the full BMI calculator →
Why people trust LifeViora
Clear, evidence-based numbers — every single time
No accounts, no clutter, no guesswork. Just the same calculations used in clinics and sports labs, explained in plain language.
Evidence-based formulas
Mifflin-St Jeor, Naegele's rule, U.S. Navy method & more.
Private by design
Everything calculates in your browser — nothing is stored.
Instant & free
No sign-up, no paywall, results in under a second.
Mobile-first build
The same fast, clean experience on phone, tablet or desktop.
Featured calculators
View all →BMI Calculator
Check your Body Mass Index and see which healthy-weight band you fall into.
Body & WeightCalorie Calculator
Estimate the daily calories you need to maintain, lose or gain weight.
Nutrition & MetabolismBMR Calculator
Find your Basal Metabolic Rate — the calories you burn at complete rest.
Nutrition & MetabolismBody Fat Calculator
Estimate your body fat percentage using the U.S. Navy tape-measure method.
Body & WeightLatest tools
Heart Rate Calculator NEW
Find your maximum heart rate and personalised training zones.
Ovulation Calculator NEW
Estimate your fertile window and ovulation day from your cycle.
Pregnancy Due Date Calculator NEW
Estimate your due date from your last period or conception date.
Age Calculator NEW
Calculate your exact age in years, months and days, plus your next birthday.
Sleep Calculator NEW
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Protein Intake Calculator NEW
Find your ideal daily protein target based on your weight and goal.
Every calculator
BMI Calculator
Check your Body Mass Index and see which healthy-weight band you fall into.
Body & WeightCalorie Calculator
Estimate the daily calories you need to maintain, lose or gain weight.
Nutrition & MetabolismBMR Calculator
Find your Basal Metabolic Rate — the calories you burn at complete rest.
Nutrition & MetabolismBody Fat Calculator
Estimate your body fat percentage using the U.S. Navy tape-measure method.
Body & WeightIdeal Weight Calculator
See an estimated healthy weight range based on four trusted formulas.
Body & WeightWater Intake Calculator
Get a personalised daily water target based on your weight and activity.
Nutrition & MetabolismMacro Calculator
Turn your calorie target into a daily protein, carb and fat breakdown.
Nutrition & MetabolismProtein Intake Calculator
Find your ideal daily protein target based on your weight and goal.
Nutrition & MetabolismSleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Sleep & TimeAge Calculator
Calculate your exact age in years, months and days, plus your next birthday.
Sleep & TimePregnancy Due Date Calculator
Estimate your due date from your last period or conception date.
Pregnancy & FertilityOvulation Calculator
Estimate your fertile window and ovulation day from your cycle.
Pregnancy & FertilityHeart Rate Calculator
Find your maximum heart rate and personalised training zones.
Fitness & Vitals