Are all Toolisk health calculators free?

Yes. Every health calculator is completely free with no sign-ups, no paywalls, and no usage limits.

Is my health data safe on Toolisk?

Absolutely. All calculations run entirely in your browser. Your height, weight, and other personal details are never sent to a server.

Should I rely on these calculators for medical decisions?

These tools are for informational purposes only. BMI and BMR are screening metrics, not diagnostic measures. Always consult a qualified healthcare provider for personalized medical advice.

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Health Tools

Free health calculators for BMI, healthy weight, BMR, and more — private, browser-based.

27 tools

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Completely private

Health data is sensitive. All calculations run locally in your browser — your weight, height, and age are never sent anywhere.

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Instant results

BMI, healthy weight range, BMR — all calculated as you type, no button to press, no page reload.

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Free, no account

Open the page, use the tool. No sign-up, no install, no email. Works on desktop and mobile.

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Sleep Calculator

Calculate the best time to go to bed or wake up based on 90-minute sleep cycles. Avoid grogginess by waking between cycles.

SleepWellnessCycles

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One Rep Max Calculator

Estimate your one-rep max from any submaximal set. Uses Epley, Brzycki, Lombardi, and O'Conner formulas with a percentage breakdown.

StrengthFitnessWeightlifting

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Running Pace Calculator

Calculate your running pace per km and mile from any distance and time. Get speed, splits for 5K, 10K, half marathon, and marathon.

RunningFitnessMarathon

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Pregnancy Weight Gain Calculator

Find out how much weight you should gain during pregnancy based on your pre-pregnancy BMI and gestational week, using IOM guidelines.

PregnancyWeight GainWomen's Health

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Pregnancy Due Date Calculator

Calculate your estimated due date and current gestational week based on your last menstrual period or conception date. Includes a week-by-week pregnancy timeline.

PregnancyDue DateWomen's Health

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Calorie Calculator

Calculate your daily calorie needs based on age, weight, height, gender, and activity level. Supports goal-based planning for weight loss, maintenance, and muscle gain.

CaloriesDietWeight Loss

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TDEE Calculator

Calculate your Total Daily Energy Expenditure to understand exactly how many calories you burn per day based on your basal metabolic rate and activity level.

TDEEFitnessMetabolism

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Macro Calculator

Calculate your optimal macronutrient split — protein, carbs, and fat — for your calorie target, body weight, and fitness goals. Supports keto, low-carb, and standard splits.

MacrosNutritionDiet

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Calorie Deficit Calculator

Calculate how long it will take to reach your goal weight based on your calorie deficit. See projected weekly and monthly weight loss with a timeline chart.

Calorie DeficitWeight LossDiet

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Body Fat Calculator

Estimate your body fat percentage using the US Navy method or BMI-based formula. Get your fat mass, lean mass, and body fat category with a visual breakdown.

Body FatFitnessBody Composition

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Water Intake Calculator

Calculate how much water you should drink daily based on your body weight, activity level, and climate. Includes personalized goals and reminders.

HydrationWaterHealth

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Keto Calculator

Calculate your optimal keto macros — net carbs, protein, and fat — to achieve and maintain ketosis. Includes TDEE base and electrolyte recommendations.

KetoLow CarbDiet

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Ideal Weight Calculator

Find your ideal body weight using multiple formulas — Devine, Robinson, Miller, and Hamwi. Compare results across all four methods.

Ideal WeightHealthBMI

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Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess your risk for cardiovascular disease and type 2 diabetes. Includes WHO classification.

WHRBody ShapeHealth Risk

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Target Heart Rate Calculator

Calculate your target heart rate zones for different exercise intensities — fat burn, cardio, peak — using the Karvonen formula.

Heart RateFitnessCardio

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Blood Pressure Calculator

Classify your blood pressure reading using AHA/ACC guidelines. Understand what your systolic and diastolic numbers mean for your heart health.

Blood PressureCardiovascularHealth

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Ovulation Calculator

Predict your fertile window and ovulation date based on your menstrual cycle length. See your chances of conception each day.

OvulationFertilityWomen's Health

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Period Calculator

Track and predict your next period, fertile window, and PMS symptoms based on your cycle length and last period date.

PeriodMenstrualWomen's Health

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BMI Calculator

Calculate your Body Mass Index with metric or imperial units. Get your BMI category, healthy weight range, and BMR estimate using the Mifflin-St Jeor equation.

BMIHealthFitness

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Caffeine Calculator

Calculate your total caffeine intake from coffee, tea, energy drinks, and more. See when your caffeine levels will drop below half.

CaffeineWellnessEnergy

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BMR Calculator

Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Understand how many calories your body burns at complete rest.

BMRMetabolismFitness

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Carb Calculator

Calculate your daily carbohydrate intake based on calorie needs and dietary preference — standard, low-carb, or ketogenic.

CarbsNutritionDiet

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Glycemic Index Calculator

Search and calculate the glycemic index and glycemic load of common foods. Essential for diabetes management and blood sugar control.

Glycemic IndexDiabetesBlood Sugar

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BAC Calculator

Estimate your blood alcohol content based on drinks consumed, body weight, gender, and time. Understand when you will be legally sober.

BACAlcoholSafety

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Cholesterol Calculator

Calculate your total cholesterol/HDL ratio, LDL/HDL ratio, and triglyceride ratio. Understand your cardiovascular risk levels.

CholesterolHeart HealthLipids

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Vitamin D Calculator

Estimate your daily Vitamin D needs based on skin type, latitude, sun exposure, and diet. Applies Endocrine Society guidelines.

Vitamin DNutritionSupplements

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Anxiety Score Calculator

Assess your anxiety level using the clinically validated GAD-7 questionnaire. Get your score with severity classification and guidance on next steps.

AnxietyMental HealthWellness

All health tools run client-side — your data never leaves your browser.

Free Health Calculators — Private by Design

Health information is personal. Toolisk's health calculators run entirely in your browser — your weight, height, age, and other measurements never leave your device. There are no accounts, no cookies tracking your health data, and no server-side processing.

These tools use established clinical formulas — the WHO BMI classification, the Mifflin-St Jeor equation for BMR — to give you accurate, reference-quality results. They are not a substitute for medical advice, but they are a reliable starting point for understanding your numbers.

BMI Calculator — Body Mass Index

The BMI calculator computes your Body Mass Index from height and weight, classifies it using WHO categories (Underweight, Normal, Overweight, Obese), and shows the healthy weight range for your height. Supports both metric (cm/kg) and imperial (ft, in/lbs) units. The optional BMR section estimates your Basal Metabolic Rate using the Mifflin-St Jeor equation.

Open the BMI Calculator →

Frequently Asked Questions

Are all Toolisk health tools really free?

Yes. Every tool is completely free with no sign-ups, paywalls, or usage limits.

Is my health data safe?

Absolutely. All calculations run entirely in your browser. Your height, weight, age, and other inputs never leave your device.

Can I use these for medical decisions?

These tools are informational screening aids, not diagnostic instruments. Always consult a qualified healthcare provider for personalized medical guidance.