Health cluster
Fitness, Nutrition & Sleep Calculators
Plan workouts, macros, and rest: heart rate zones, VO2 max, protein and macro targets, keto and vegan meal planning, plus sleep cycle and sleep debt tools.
Top calculators
A short starting set for the most common fitness, nutrition & sleep calculators workflows.
Blood Sugar Converter (Glucose): mg/dL ↔ mmol/L
Convert glucose between mg/dL and mmol/L with accurate rounding. Includes formulas, worked examples, and a quick common conversions table.
Blue Light Melatonin Suppression Calculator (Screen Brightness & Time)
Estimate melatonin suppression from evening screen exposure using brightness (lux), viewing time (minutes), and blue-light filter reduction. Includes formula, examples, and practical guidance.
Circadian Light Exposure Planner (Melanopic Lux & Phase Shift Estimate)
Plan morning and evening light exposure and estimate a simplified circadian phase shift using melanopic exposure (lux·min) and a melanopic ratio.
DASH Diet Sodium Planner | Daily Sodium Budget by Meal
Use this DASH Diet Sodium Planner to split a daily sodium target into practical per-meal goals. Learn how the formula works, what the inputs mean, and how to use the result for meal planning.
Insomnia Severity Index Calculator - Evaluate Sleep Difficulties
Answer seven questions to determine your Insomnia Severity Index (ISI) score and see whether your sleep issues are mild or severe.
Virtual Marathon Training Pacer - Plan Weekly Speeds
Generate a simple pacing plan for your marathon training. Enter your goal finish time and number of weeks to get recommended pace adjustments.
Potassium Intake Calculator (mg/day) — Recommended Daily Intake by Age & Sex
Use this potassium intake calculator to estimate recommended daily potassium intake in mg/day by age and sex, then compare it with your current intake to see the difference.
Steps to Distance Converter (Miles & Kilometers)
Convert step count to distance in miles and kilometers using your stride length. Includes examples, stride tips, and accuracy limitations.
All calculators in this cluster
Browse 11 calculators matched to this topic, or return to the Health category.
Army Combat Fitness Test (ACFT) Score Calculator
Estimate your Army Combat Fitness Test (ACFT) score from six event performances. See per-event points, total score, and pass/fail based on 60-point minimums.
Blood Sugar Converter (Glucose): mg/dL ↔ mmol/L
Convert glucose between mg/dL and mmol/L with accurate rounding. Includes formulas, worked examples, and a quick common conversions table.
Blue Light Melatonin Suppression Calculator (Screen Brightness & Time)
Estimate melatonin suppression from evening screen exposure using brightness (lux), viewing time (minutes), and blue-light filter reduction. Includes formula, examples, and practical guidance.
Circadian Light Exposure Planner (Melanopic Lux & Phase Shift Estimate)
Plan morning and evening light exposure and estimate a simplified circadian phase shift using melanopic exposure (lux·min) and a melanopic ratio.
DASH Diet Sodium Planner | Daily Sodium Budget by Meal
Use this DASH Diet Sodium Planner to split a daily sodium target into practical per-meal goals. Learn how the formula works, what the inputs mean, and how to use the result for meal planning.
Déjà Vu Frequency Estimator (Monthly) | Age, Sleep, Stress & Novelty
Estimate how often déjà vu experiences might occur each month using a simple model based on age, sleep habits, stress level, and exposure to novel environments.
Fluoride Intake Calculator | Estimate Daily Exposure from Water and Toothpaste
Estimate daily fluoride intake from drinking water, swallowed toothpaste, and other sources, then compare the total with common reference limits.
Insomnia Severity Index Calculator - Evaluate Sleep Difficulties
Answer seven questions to determine your Insomnia Severity Index (ISI) score and see whether your sleep issues are mild or severe.
Potassium Intake Calculator (mg/day) — Recommended Daily Intake by Age & Sex
Use this potassium intake calculator to estimate recommended daily potassium intake in mg/day by age and sex, then compare it with your current intake to see the difference.
Steps to Distance Converter (Miles & Kilometers)
Convert step count to distance in miles and kilometers using your stride length. Includes examples, stride tips, and accuracy limitations.
Virtual Marathon Training Pacer - Plan Weekly Speeds
Generate a simple pacing plan for your marathon training. Enter your goal finish time and number of weeks to get recommended pace adjustments.