Divide consistently measured waist circumference by hip circumference and show an explicit measurement-variation interval and user-entered comparison.

WSD

Walking Step Distance Calculator

Multiply recorded steps by an entered average stride length, preserve a step-count error range, and calculate speed, cadence, and a separate MET energy estimate.

PIS

Protein Intake Scenario Calculator

For the Protein Intake Scenario Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add only...

HRZT

Heart Rate Zone Target Range Calculator

For the Heart Rate Zone Target Range Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while...

RTDP

Running Training Dose Planning Calculator

For the Running Training Dose Planning Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and...

BPE

Blood Pressure Estimate Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

MIPP

Medication Interval Progress Plan Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

SDT

Sleep Debt Trend Calculator

Compare entered sleep opportunity with a nightly target, carry forward existing debt, and subtract only the explicitly planned extra sleep and naps over the selected horizon.

TDEE Calculator

Multiply BMR by the entered activity factor and add the selected daily energy adjustment for a planning target.

Waist-to-Height Estimate Calculator

Divide waist circumference by height using the same unit and express the result as both a decimal ratio and percentage, with 0.50 shown as a general adult screening reference.

Waist-to-Height Trend Calculator

Divide waist circumference by height on the same unit basis, then apply the entered monthly change without projecting past the entered target.

DHT

Daily Hydration Target Calculator

Build the daily hydration estimate from body weight, an entered per-kilogram rate, activity duration, an hourly activity addition, and an explicit environment adjustment, then...

WIE

Water Intake Estimate Calculator

For the Water Intake Estimate Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

HRZT

Heart Rate Zone Trend Calculator

For the Heart Rate Zone Trend Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while keeping...

RTS

Running Training Schedule Calculator

Interpolate from current to target weekly distance, separate long, easy and quality distance, estimate weekly time demand, and compare the target with the entered recent peak.

BPTR

Blood Pressure Target Range Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

MIRS

Medication Interval Risk Screening Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

SDPP

Sleep Debt Progress Plan Calculator

Compare entered sleep opportunity with a nightly target, carry forward existing debt, and subtract only the explicitly planned extra sleep and naps over the selected horizon.

Ideal Weight Calculator

Apply a height-based reference equation above 152.4 cm and then apply the entered frame adjustment.

Caffeine Intake Calculator

Multiply servings by caffeine content and apply exponential half-life decay for a rough remaining-caffeine estimate.

DPTR

Daily Protein Target Range Calculator

Calculate a lower and upper daily protein range from body weight and separate entered gram-per-kilogram rates, then translate the midpoint into meal-level planning without...

LBMP

Lean Body Mass Progress Plan Calculator

For the Lean Body Mass Progress Plan Calculator, estimate current lean and fat mass from the entered body-fat percentage, preserve lean mass for a target-weight reference, and...

WITR

Water Intake Target Range Calculator

For the Water Intake Target Range Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

HRZP

Heart Rate Zone Progress Plan Calculator

For the Heart Rate Zone Progress Plan Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while...

RTS

Running Training Scenario Calculator

Interpolate from current to target weekly distance, separate long, easy and quality distance, estimate weekly time demand, and compare the target with the entered recent peak.

BPT

Blood Pressure Trend Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

MIDP

Medication Interval Dose Planning Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

SDRS

Sleep Debt Risk Screening Calculator

Compare entered sleep opportunity with a nightly target, carry forward existing debt, and subtract only the explicitly planned extra sleep and naps over the selected horizon.

Macronutrient Calculator

Allocate calories using entered macronutrient percentages and convert protein and carbohydrate at 4 kcal/g and fat at 9 kcal/g.

MAC

MET Activity Calorie Calculator

Apply the standard MET oxygen-cost conversion to body weight and minutes, and report gross energy separately from the signed energy difference relative to the entered resting...

LBMR

Lean Body Mass Risk Screening Calculator

For the Lean Body Mass Risk Screening Calculator, estimate current lean and fat mass from the entered body-fat percentage, preserve lean mass for a target-weight reference,...

WIT

Water Intake Trend Calculator

For the Water Intake Trend Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing current...

HRZR

Heart Rate Zone Risk Screening Calculator

For the Heart Rate Zone Risk Screening Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while...

KFE

Kidney Function Estimate Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

BPPP

Blood Pressure Progress Plan Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

GAE

Gestational Age Estimate Calculator

Calculate LMP-based gestational age and due date with the entered cycle-length adjustment, then independently calculate an ultrasound-based due-date reference and their exact...

TRE

Training Recovery Estimate Calculator

Calculate session-RPE training load, split the entered strength share, retain sleep, resting-heart-rate change and soreness as separate monitoring references, and project only...

Protein Intake Calculator

Multiply body weight by the entered grams-per-kilogram target and distribute the result across the selected number of meals.

DPD

Daily Protein Distribution Calculator

Translate a user-selected grams-per-kilogram target into daily protein and explicit meal allocations, while displaying whether shares total 100%.

PITR

Protein Intake Target Range Calculator

For the Protein Intake Target Range Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add...

WIPP

Water Intake Progress Plan Calculator

For the Water Intake Progress Plan Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

HRZS

Heart Rate Zone Schedule Calculator

For the Heart Rate Zone Schedule Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while keeping...

KFTR

Kidney Function Target Range Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

BPRS

Blood Pressure Risk Screening Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

GATR

Gestational Age Target Range Calculator

Calculate LMP-based gestational age and due date with the entered cycle-length adjustment, then independently calculate an ultrasound-based due-date reference and their exact...

TRTR

Training Recovery Target Range Calculator

Calculate session-RPE training load, split the entered strength share, retain sleep, resting-heart-rate change and soreness as separate monitoring references, and project only...

Hydration Calculator

Multiply body weight by the entered base rate and add an exercise allowance proportional to duration.

Sleep Efficiency Calculator

Subtract entered awake intervals from time in bed and report estimated sleep duration, efficiency, and the gap to a user-selected target.

PIT

Protein Intake Trend Calculator

For the Protein Intake Trend Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add only the...

WIRS

Water Intake Risk Screening Calculator

For the Water Intake Risk Screening Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before...

RTE

Running Training Estimate Calculator

For the Running Training Estimate Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and compare...

KFT

Kidney Function Trend Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

BPDP

Blood Pressure Dose Planning Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

GAT

Gestational Age Trend Calculator

Calculate LMP-based gestational age and due date with the entered cycle-length adjustment, then independently calculate an ultrasound-based due-date reference and their exact...

TRT

Training Recovery Trend Calculator

Calculate session-RPE training load, split the entered strength share, retain sleep, resting-heart-rate change and soreness as separate monitoring references, and project only...

PDD

Pregnancy Due Date Calculator

Add 280 days to the first day of the last menstrual period and adjust by the difference between entered cycle length and 28 days.

ABW

Adjusted Body Weight Calculator

Apply an entered fraction of weight above a separately entered ideal-weight reference and show the arithmetic impact on a capped dose example.

SDRP

Sleep Debt Recovery Planner

Calculate an arithmetic sleep shortfall and distribute it across recovery nights subject to an entered maximum extra-sleep allowance.

LBMT

Lean Body Mass Target Range Calculator

Estimate present fat and lean mass, then solve two explicitly entered body-fat and lean-mass scenarios rather than assuming lean mass stays fixed.

PIPP

Protein Intake Progress Plan Calculator

For the Protein Intake Progress Plan Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add...

WIDP

Water Intake Dose Planning Calculator

For the Water Intake Dose Planning Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

RTTR

Running Training Target Range Calculator

For the Running Training Target Range Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and...

KFPP

Kidney Function Progress Plan Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

BPS

Blood Pressure Schedule Calculator

Keep systolic and diastolic readings separate, calculate pulse pressure and mean arterial pressure, compare with prior readings and entered targets, and count the planned...

GAPP

Gestational Age Progress Plan Calculator

Calculate LMP-based gestational age and due date with the entered cycle-length adjustment, then independently calculate an ultrasound-based due-date reference and their exact...

TRPP

Training Recovery Progress Plan Calculator

Calculate session-RPE training load, split the entered strength share, retain sleep, resting-heart-rate change and soreness as separate monitoring references, and project only...

Ovulation Calculator

Estimate the next cycle from entered length, subtract the luteal phase for ovulation, and show a planning fertile window.

LBM

Lean Body Mass Calculator

Calculate the sex-coded Boer estimate and an independent body-fat-based estimate, including an explicit measurement-error range.

SSO

Shift Sleep Opportunity Calculator

Convert main and nap opportunities into estimated sleep by subtracting entered wind-down, latency, and awake time, then compare with a selected target.

WTR

Waist-to-Height Target Range Calculator

Translate user-entered comparison ratios into exact waist measurements for one height and preserve an explicit tape-measure uncertainty interval around the current ratio.

WSC

Waist-to-Height Scenario Comparison Calculator

Compare each waist to height scenario on one entered height, preserving the current and alternative ratios, measurement-variation interval, and planning horizon.

LBMT

Lean Body Mass Trend Calculator

Apply separately entered weekly weight and body-fat percentage-point changes, then recalculate lean and fat mass at every displayed week.

PIRS

Protein Intake Risk Screening Calculator

For the Protein Intake Risk Screening Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add...

WIS

Water Intake Schedule Calculator

For the Water Intake Schedule Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

RTT

Running Training Trend Calculator

For the Running Training Trend Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and compare the...

KFRS

Kidney Function Risk Screening Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

MIE

Medication Interval Estimate Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

GARS

Gestational Age Risk Screening Calculator

Calculate LMP-based gestational age and due date with the entered cycle-length adjustment, then independently calculate an ultrasound-based due-date reference and their exact...

TRRS

Training Recovery Risk Screening Calculator

Calculate session-RPE training load, split the entered strength share, retain sleep, resting-heart-rate change and soreness as separate monitoring references, and project only...

WRS

Waist-to-Height Risk Screening Calculator

Calculate the waist-to-height ratio, selected reference position, measurement-variation range, and an exact circumference corresponding to a user-chosen planning ratio.

UNBF

US Navy Body Fat Estimate Calculator

Apply the sex-coded circumference equation using metric measurements consistently, then translate the estimate into fat and lean mass.

CDT

Calorie Deficit Timeline Calculator

Reconcile maintenance, intake, signed activity change, adherence, and horizon into an arithmetic energy balance where positive means deficit and negative means surplus, then...

WPS

Waist-to-Height Progress Schedule Calculator

Distribute the selected waist change evenly across months, cap the monthly step explicitly, and tabulate waist and ratio checkpoints without inferring biological response.

LBME

Lean Body Mass Estimate Calculator

Estimate lean body mass from body weight and entered body-fat percentage, then expose measurement variation, a comparison estimate, and the optional protein reference.

HEH

Hot-Weather Exercise Hydration Calculator

Build the hot-weather hydration estimate from body weight, an entered per-kilogram rate, activity duration, an hourly activity addition, and an explicit environment...

PIDP

Protein Intake Dose Planning Calculator

For the Protein Intake Dose Planning Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add...

WIS

Water Intake Scenario Calculator

For the Water Intake Scenario Calculator, calculate a body-weight baseline range, then add the explicitly entered exercise, climate and other adjustments before comparing...

RTPP

Running Training Progress Plan Calculator

For the Running Training Progress Plan Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and...

KFDP

Kidney Function Dose Planning Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

MITR

Medication Interval Target Range Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

SDE

Sleep Debt Estimate Calculator

Compare entered sleep opportunity with a nightly target, carry forward existing debt, and subtract only the explicitly planned extra sleep and naps over the selected horizon.

WPP

Waist-to-Height Progress Plan Calculator

Translate the entered target ratio into an exact waist circumference and build checkpoint dates from a transparent weekly change assumption without projecting below the target.

BAI

Body Adiposity Index Calculator

Calculate BAI from hip circumference and height while displaying BMI and waist-to-height ratio only as separate comparison measures.

FBT

Five-Measurement Bodyweight Trend Calculator

Summarize five entered measurements with mean, median, range, and first-to-last arithmetic change over the exact day span.

MDS

Medical Deductible Savings Calculator

Apply allowed expenses to the deductible first, calculate coinsurance only above it, cap modeled patient responsibility at the entered in-network maximum, add a separate...

PIS

Protein Intake Schedule Calculator

For the Protein Intake Schedule Calculator, multiply body weight by explicit lower and upper protein factors, calculate a midpoint, distribute it across meals, and add only...

HRZE

Heart Rate Zone Estimate Calculator

For the Heart Rate Zone Estimate Calculator, use the 208 - 0.7 x age population reference, calculate heart-rate reserve, and apply the entered reserve intensity while keeping...

RTRS

Running Training Risk Screening Calculator

For the Running Training Risk Screening Calculator, interpolate from current to target weekly distance, separate long, easy and quality distance, estimate time demand, and...

KFS

Kidney Function Schedule Calculator

Apply the official 2021 CKD-EPI creatinine equation with the entered age, sex constant and serum creatinine, then retain prior eGFR, ACR and body-surface-area references for...

MIT

Medication Interval Trend Calculator

Perform schedule arithmetic only from a clinician-prescribed dose and interval, display the next clock time, dose counts and an entered half-life reference without selecting a...

SDTR

Sleep Debt Target Range Calculator

Compare entered sleep opportunity with a nightly target, carry forward existing debt, and subtract only the explicitly planned extra sleep and naps over the selected horizon.

Use personal measurements with the right reference

Health and fitness calculators translate measurements such as height, weight, age, pace, heart rate, activity, and food intake into planning estimates. They can support training or everyday wellness decisions, but different formulas apply to different populations.

Enter measurements in the units shown and check whether the method is appropriate for the person's age, sex, body composition, medical status, or training background. Reference ranges are screening aids rather than diagnoses or individual treatment advice.

If symptoms, medication, pregnancy, rapid weight change, or a diagnosed condition affects the question, use the calculator only as background information and seek an appropriate clinician's guidance.

Directory guide

How to choose a health calculator

Use the right population Age, sex, training status, pregnancy, and clinical context can determine whether a health formula is appropriate.

Verify measurement units Body weight, height, pace, energy, and serving inputs must use the units selected beside each field.

Treat results as estimates Screening ranges and fitness targets support planning but do not replace individual medical assessment.

Calculator selection

Which health calculator should I use?

Calculator	Main inputs	Main outputs	Best for
BMI Calculator	Height and weight	BMI and general weight range	Basic weight screening
BMR Calculator	Age, sex, height, and weight	Estimated resting energy use	Resting calorie needs
TDEE Calculator	BMR variables and activity level	Estimated daily energy expenditure	Maintenance-calorie planning
Body Fat Calculator	Body measurements and method	Estimated body-fat percentage	Body-composition screening

Common tasks

If you try to calculate

Key terms

Health calculation glossary

BMI Weight divided by height squared, used as a broad screening index.

BMR Estimated energy used by the body at rest.

TDEE Estimated total daily energy expenditure including activity.

Maintenance calories An estimated intake associated with stable body weight.

Body-fat percentage The estimated share of body mass made up of fat tissue.

Activity factor A multiplier used to scale resting energy for daily activity.