Health
Fitness and wellbeing calculators using standard published formulas. Informational, not medical advice.
20 free health tools. Every tool runs in your browser, works without an account, and processes files locally whenever the browser allows it.
By the utils.sbs team · Reviewed November 2026
The shelf
All health tools
20 tools · updated for 2026
- BMI CalculatorpopularCalculate body mass index from height and weight.
- BMR CalculatorEstimate basal metabolic rate with Mifflin-St Jeor.
- TDEE CalculatorEstimate daily calorie needs from activity level.
- Calories Burned CalculatorEstimate calories burned by activity and time.
- Body Fat CalculatorEstimate body fat percentage with the US Navy method.
- Ideal Weight CalculatorEstimate a healthy weight range from height.
- Water Intake CalculatorEstimate a daily hydration target.
- Macro CalculatorSplit calories into protein, carbs and fat.
- Protein Intake CalculatorEstimate daily protein from body weight and activity.
- Running Pace CalculatorCalculate pace, speed and finish time.
- Finish Time CalculatorPredict race finish time from pace and distance.
- Heart Rate ZonesEstimate training zones from age and resting heart rate.
- One Rep Max CalculatorEstimate 1RM from weight and reps.
- Pregnancy Due DateEstimate a due date from the last period date.
- Sleep CalculatorFind bedtimes that fit 90-minute sleep cycles.
- Steps to DistanceConvert step counts into distance and calories.
- Waist-to-Hip RatioCalculate waist-to-hip ratio and risk category.
- Lean Body MassEstimate lean body mass from weight and height.
- BAC CalculatorEstimate blood alcohol content (informational only).
- Ovulation CalculatorEstimate a fertile window from cycle length.
How this shelf works
About health tools
Health tools handle the small, repeatable jobs that show up between real work: body and fitness. They are built as focused utilities, so each page does one job without asking you to create an account or install software.
Open a tool, add your input, adjust the settings, and download the result. Processing happens in the browser using the platform APIs available for that file type. Files are not uploaded to a server, so the tool keeps working offline once the page has loaded.
Looking for something else? Browse the full tool index or search the catalogue from the homepage.
Health tool questions
Are health tools free?
Yes. Every health tool on utils.sbs is free, requires no account, and has no per-file or per-use charge.
Are my files uploaded when I use a health tool?
No. The tools are designed to process input in the browser whenever the platform API allows it. Files are not uploaded to a server for processing.
Do I need to install anything to use these tools?
No. Everything runs in a modern web browser. Open a tool page, use the workspace, and download the result.
How do I choose the right health tool?
Each tool page describes what it does, its input and output formats, the engine it uses, and its limitations. Start with the description that matches your job, then open the tool page for the workspace and step-by-step guide.