Home › Blog

HealthToad Blog

All 60 guides, by topic

Short, practical guides that explain the idea behind each calculator — the formula, the common mistake, and what to do next. Every guide links to the tool it belongs to, so you can read first and calculate second, or the other way round.

Browse by group below, or jump straight to the tools if you already know what you want to measure.

Hydration & Body Metrics

Tools in this group: Daily Water Intake Calculator · BMI & Body Fat Estimator · Calorie Deficit & TDEE Calculator · BMR Calculator · Ideal Body Weight Calculator

BMI vs Body Fat Percentage: What Each Number Really Means

Hydration & Body Metrics

BMR Explained: The Calories You Burn Doing Nothing

Hydration & Body Metrics

Building a Calorie Deficit That Does Not Leave You Hungry

Hydration & Body Metrics

Calorie Deficit Plateaus: Why Weight Loss Stalls and How to Restart It

Hydration & Body Metrics

Electrolytes Explained: When Plain Water Is Not Enough

Hydration & Body Metrics

Healthy Weight Range vs Ideal Weight: Which Should You Aim For?

Hydration & Body Metrics

How Age, Muscle and Hormones Change Your BMR

Hydration & Body Metrics

How Much Water Do You Actually Need Each Day?

Hydration & Body Metrics

How to Measure Body Fat at Home Without a Scan

Hydration & Body Metrics

Ideal Body Weight Formulas: Devine, Robinson and Miller Compared

Hydration & Body Metrics

Raising Your BMR: Realistic Ways to Burn More at Rest

Hydration & Body Metrics

Setting a Realistic Weight Goal After 40

Hydration & Body Metrics

Seven Hydration Mistakes That Leave You Tired

Hydration & Body Metrics

TDEE Explained: How Many Calories You Burn in a Day

Hydration & Body Metrics

Why Your BMI Can Be Misleading — and What to Track Instead

Hydration & Body Metrics

Fitness, Movement & Running

Tools in this group: Step-to-Calorie Converter · Running Pace Calculator · Target Heart Rate Calculator · Walking vs Running Comparison · Daily Activity Calorie Estimator

Calories You Burn Without Exercising: The Power of Daily Activity

Fitness, Movement & Running

Fat-Burning Zone: Myth or Useful Guide?

Fitness, Movement & Running

Gardening, Cleaning and DIY: How Much Do Household Jobs Really Burn?

Fitness, Movement & Running

How to Add 300 Extra Calories of Movement to an Office Day

Fitness, Movement & Running

How to Switch From Walking to Running Without Injury

Fitness, Movement & Running

Is 10,000 Steps a Day the Right Target for You?

Fitness, Movement & Running

Negative Splits and Race Day Pacing Mistakes to Avoid

Fitness, Movement & Running

Pacing Your First 5K, 10K and Half Marathon

Fitness, Movement & Running

Running Pace Explained: How to Find a Pace You Can Hold

Fitness, Movement & Running

Steps to Calories: How Your Phone Counts Burn — and Where It Goes Wrong

Fitness, Movement & Running

Target Heart Rate Zones Explained in Plain English

Fitness, Movement & Running

Training by Heart Rate Without a Chest Strap

Fitness, Movement & Running

Turning Everyday Walking Into Real Calorie Burn

Fitness, Movement & Running

Walking vs Running for Weight Loss, Joints and Long-Term Health

Fitness, Movement & Running

Walking vs Running: Which Burns More — and Which Is Better for You?

Fitness, Movement & Running

Sleep, Rest & Recovery

Tools in this group: Sleep Cycle & Bedtime Calculator · Screen Time & Eye Strain Timer · Box Breathing Visualizer · Sleep Duration & Quality Logger

Box breathing for anxiety before big moments

Sleep, Rest & Recovery

Box breathing vs other calm-down techniques: what each one is actually for

Sleep, Rest & Recovery

Fixing a broken sleep schedule without a miserable week

Sleep, Rest & Recovery

How to rate sleep quality honestly

Sleep, Rest & Recovery

How to use box breathing at work without anyone noticing

Sleep, Rest & Recovery

Napping without waking up groggy: the 20-minute rule and its exceptions

Sleep, Rest & Recovery

Reducing evening screen time for better sleep

Sleep, Rest & Recovery

The 20-20-20 rule explained for office workers

Sleep, Rest & Recovery

Turning two weeks of sleep notes into better nights

Sleep, Rest & Recovery

What a sleep log reveals that a tracker misses

Sleep, Rest & Recovery

Why 90-minute sleep cycles matter more than total hours in bed

Sleep, Rest & Recovery

Why your eyes burn after long screen days

Sleep, Rest & Recovery

Nutrition, Diet & Macros

Tools in this group: Macro Nutrient Ratio Calculator · Caffeine Half-Life Tracker · Sugar Intake Limit Checker · Recipe Ingredient Scaler · Fruit & Vegetable Serving Tracker · Wellness Habit Streak Counter

Building a morning wellness routine that sticks

Nutrition, Diet & Macros

Caffeine timing for early shifts and late nights

Nutrition, Diet & Macros

Cutting added sugar without giving up sweet food

Nutrition, Diet & Macros

Daily sugar limits explained in plain numbers

Nutrition, Diet & Macros

Doubling a recipe without ruining it

Nutrition, Diet & Macros

Eating more vegetables when you dislike salad

Nutrition, Diet & Macros

Five a day: what a serving actually looks like

Nutrition, Diet & Macros

Halving recipes for one or two people

Nutrition, Diet & Macros

Hidden sugars in everyday foods

Nutrition, Diet & Macros

How long caffeine really stays in your body

Nutrition, Diet & Macros

How much protein do you actually need?

Nutrition, Diet & Macros

Keto-style macro splits without the guesswork

Nutrition, Diet & Macros

Protein, fat and carb splits explained for beginners

Nutrition, Diet & Macros

Restarting a broken habit streak without quitting

Nutrition, Diet & Macros

Scaling baking recipes when the maths gets tricky

Nutrition, Diet & Macros

Seasonal fruit and vegetable servings through the year

Nutrition, Diet & Macros

The afternoon coffee cutoff that protects sleep

Nutrition, Diet & Macros

Why small daily streaks beat big resolutions

Nutrition, Diet & Macros