Free Health & Nutrition Calculators
Use our free nutrition calculators to estimate your daily calorie needs, healthy weight gain calories and recommended daily water intake. These easy-to-use tools are designed to provide quick estimates that can help you make informed dietary decisions and support your health goals.
Whether you’re aiming to maintain your weight, build muscle, gain weight or improve hydration, our calculators offer practical guidance based on widely accepted nutrition formulas. For the best results, combine these estimates with a balanced diet and advice from a qualified healthcare professional when needed.
Calculate Your Daily Calorie Needs
Your Results
| BMI | |
| BMR | |
| Maintenance Calories | |
| Mild Weight Loss | |
| Moderate Weight Loss | |
| Mild Weight Gain | |
| Moderate Weight Gain |
This calculator uses the Mifflin-St Jeor equation to estimate your daily calorie needs. Individual requirements may vary.
Weight Gain Calorie Calculator
Your Results
| BMI | |
| Maintenance Calories | |
| Gain 0.25 kg/week | |
| Gain 0.5 kg/week | |
| Gain 1 kg/week |
Healthy weight gain is usually achieved by consuming around 250–500 extra calories per day while combining resistance training with sufficient protein intake.
Daily Water Intake Calculator
Your Daily Water Requirement
| Recommended Water | |
| Millilitres | |
| Approximate Glasses (250ml) |
This estimate is based on body weight with adjustments for activity level and climate. Individual hydration needs may vary depending on health conditions, pregnancy, illness and diet.
Whether you’re trying to maintain your weight, gain healthy weight or improve your daily hydration, our calculators provide quick estimates based on widely accepted nutrition formulas. Simply enter your details to receive personalised recommendations that can help you make informed dietary decisions.
Our collection currently includes:
- Daily Calorie Needs Calculator
- Weight Gain Calorie Calculator
- Water Intake Calculator
More nutrition and health calculators will be added regularly to help you better understand your body’s needs.
Internal Links
- Meal Planning Basics
- How Many Calories Do You Need to Gain Weight?
- Best Foods to Help You Gain Weight
- Why Are You Not Gaining Weight?
- Signs That You Are Not Eating Enough
- Healthy Weight Gain Guide
People Also Ask
How accurate are online calorie calculators?
Online calorie calculators provide estimates using established formulas such as the Mifflin-St Jeor equation. Your actual calorie needs may vary depending on body composition, health conditions and activity levels.
Which calorie calculator is the most accurate?
Most modern calorie calculators use scientifically recognised formulas. They provide a useful starting point for planning your diet, although individual requirements may differ.
How much water should I drink each day?
Daily water intake depends on your body weight, activity level and climate. Our Water Intake Calculator provides a personalised estimate based on these factors.
Can I use these calculators to gain weight?
Yes. Our Weight Gain Calorie Calculator estimates the daily calorie intake needed to support gradual, healthy weight gain based on your current body measurements and activity level.