OmniCalcsHealth Calculators
Free health calculators for BMI, calories, pregnancy, fitness and daily wellness.
BMI Calculator
Body mass index, category and healthy weight range.
Body Fat Calculator
US Navy method for fat and lean body mass.
Calorie Calculator
Daily calorie needs based on your activity level.
BMR Calculator
Basal metabolic rate with two proven formulas.
One Rep Max Calculator
Estimate your 1RM from any set with four formulas.
BAC Calculator
Estimate blood alcohol content from drinks and time.
Ideal Weight Calculator
Healthy target weight for your height.
Pregnancy Calculator
Week-by-week progress and key milestones.
Due Date Calculator
Estimated delivery date and trimester dates.
Pregnancy Weight Gain Calculator
IOM recommended gain from pre-pregnancy BMI.
Ovulation Calculator
Fertile window and ovulation day estimate.
Water Intake Calculator
Daily hydration target for your body.
Macro Calculator
Protein, fat and carbohydrate targets.
Lean Body Mass Calculator
LBM and body fat percentage estimate.
Heart Rate Zone Calculator
Training zones from your max heart rate.
Steps to Calories Calculator
Burn estimate, distance and time.
Running Pace Calculator
Pace, speed and projected race times.
Waist-to-Hip Ratio
WHR and abdominal fat health risk.
Child BMI Calculator
CDC percentile for ages 2–20.
Blood Pressure Category
Classify a reading with AHA/ACC stages.
Exercise Calorie Burn
Calories burned across 60+ activities.
Sleep Calculator
Best bedtime or wake time by cycles.
About Health Calculators
Free health calculators for BMI, calories, pregnancy, fitness and daily wellness.
Every tool runs entirely in your browser — instant results, no sign-up, no data sent to any server. All formulas are standard and published so you can verify the math yourself.
Frequently Asked Questions
Are these tools really free?
Yes. Every health tool on OmniCalcs is 100% free with no registration, and always will be.
Do I need to install anything?
No. All calculators run in your browser with pure HTML, CSS and JavaScript — nothing to download.
How accurate are the results?
Each tool uses standard, published formulas shown on its page, so you can verify every result yourself.