Do I need to install anything to use these health calculators?

No. Every health and fitness calculator on ArrayKit runs directly in your browser, so there is nothing to install and the measurements you enter are processed locally on your device.

Do these health calculators upload my body measurements?

No. All of the math happens in your browser, so the height, weight, age and other figures you type never leave your device or get uploaded to ArrayKit.

Are the health and fitness results medical advice?

No. These calculators provide general estimates based on standard formulas for education and planning only. They cannot account for your full health picture, so consult a qualified healthcare professional for medical decisions.

Which health and fitness calculators does ArrayKit offer?

The category covers body metrics (BMI, body fat, BMR, TDEE), nutrition (calories, macros, protein, carbs), fitness (pace, one-rep max, heart rate) and pregnancy tools like due date, ovulation and conception calculators.

Health & Fitness Calculators

ArrayKit's health and fitness calculators help you estimate BMI, daily calories, body fat, macronutrients, target heart rate, one-rep max and pregnancy dates without sending your body measurements to a remote server. Each calculator runs entirely in your browser, so the height, weight, age and other figures you enter stay on your device. They use widely cited formulas such as Mifflin-St Jeor for BMR, the US Navy method for body fat and Naegele's rule for due dates. These tools give general estimates for education and planning only — they are not medical advice, so talk to a qualified healthcare professional about anything that matters for your health.

BMI Calculator — Calculate body mass index and see the healthy weight range for your height.
BMR Calculator — Estimate your basal metabolic rate — the calories your body burns at rest.
TDEE Calculator — Estimate total daily energy expenditure from BMR and activity level.
Calorie Calculator — Estimate daily calories to maintain, lose or gain weight from your stats.
Macro Calculator — Split your daily calories into protein, carbs and fat grams by ratio.
Protein Calculator — Estimate your daily protein needs from weight and activity level.
Carbohydrate Calculator — Estimate daily carbohydrate grams from your calories and diet split.
Fat Intake Calculator — Estimate daily dietary fat grams from your calories and target percentage.
Body Fat Calculator — Estimate body fat percentage with the US Navy tape measurement method.
Army Body Fat Calculator — Estimate body fat with the US Army (AR 600-9) circumference method.
Lean Body Mass Calculator — Estimate lean body mass and fat mass from height, weight and sex.
Ideal Weight Calculator — Estimate ideal body weight with the Devine, Robinson, Miller and Hamwi formulas.
Healthy Weight Calculator — Find the healthy weight range for your height from the normal BMI band.
Body Type Calculator — Estimate your body shape from bust, waist and hip measurements.
Body Surface Area Calculator — Estimate body surface area (BSA) with Mosteller, Du Bois and other formulas.
Calories Burned Calculator — Estimate calories burned by activity using MET values, weight and time.
Pace Calculator — Calculate running pace, time or distance and convert between pace units.
One Rep Max Calculator — Estimate your one-rep max from a weight and reps with several formulas.
Target Heart Rate Calculator — Find your target heart-rate training zones from age and resting rate.
GFR Calculator — Estimate glomerular filtration rate (eGFR) with the CKD-EPI 2021 equation.
BAC Calculator — Estimate blood alcohol content from drinks, weight, sex and time.
Due Date Calculator — Estimate a pregnancy due date from the last menstrual period (Naegele’s rule).
Pregnancy Calculator — Track pregnancy progress, trimester and milestones from the due date or LMP.
Ovulation Calculator — Estimate your fertile window and ovulation day from your cycle.
Conception Calculator — Estimate the likely conception date from a due date or last period.
Period Calculator — Predict your next several periods and fertile windows from your cycle.
Pregnancy Weight Gain Calculator — Estimate a healthy pregnancy weight-gain range from pre-pregnancy BMI.
Pregnancy Conception Calculator — Estimate the conception date and fertile window from a known pregnancy.

Frequently asked questions

Do I need to install anything to use these health calculators?: No. Every health and fitness calculator on ArrayKit runs directly in your browser, so there is nothing to install and the measurements you enter are processed locally on your device.
Do these health calculators upload my body measurements?: No. All of the math happens in your browser, so the height, weight, age and other figures you type never leave your device or get uploaded to ArrayKit.
Are the health and fitness results medical advice?: No. These calculators provide general estimates based on standard formulas for education and planning only. They cannot account for your full health picture, so consult a qualified healthcare professional for medical decisions.
Which health and fitness calculators does ArrayKit offer?: The category covers body metrics (BMI, body fat, BMR, TDEE), nutrition (calories, macros, protein, carbs), fitness (pace, one-rep max, heart rate) and pregnancy tools like due date, ovulation and conception calculators.