Nutrition Calculator

These tools cover daily nutrition from multiple angles. The Macro Calculator breaks down carbohydrate, fat, and protein targets; the Protein Calculator sets intake targets by body weight; and the Calorie Calculator gives you a baseline energy figure. The Water Intake Calculator adds hydration to the picture, while the Raw Dog Food Calculator, Dog Food Calculator, and Omega-3 For Dogs Calculator extend the collection to cover pet nutrition.

Browse the most-popular list to see which tools visitors rely on most, or open the Trending tab for what's gaining traction right now. All calculators are free, require no account, and work on any device.

  • Calorie Calculator
    Enter age, gender, height, weight, and activity to get daily calories. See your BMR, maintenance, and targets for weight loss or gain. Metric/imperial.
  • Pregnancy Calorie Needs Calculator
    Estimate daily calorie needs during pregnancy by trimester. Uses Mifflin-St Jeor TDEE plus standard +340/+452 kcal add-ons. General guidance only.
  • Calories to Kilojoules Converter
    Convert calories (kcal) to kilojoules (kJ) and back instantly. Uses the exact factor 1 kcal = 4.184 kJ for accurate energy conversions.
  • Water Intake Calculator
    Calculate your personalized daily water intake based on your weight, activity level, and climate. Get recommendations in liters, fluid ounces, and cups for optimal hydration.
  • Blood Alcohol Content (BAC) Calculator
    Estimate your blood alcohol content (BAC) with the Widmark formula from drinks, body weight, gender and time. Educational estimate only — never use to decide to drive.
  • Daily Calorie Intake by Goal Calculator
    Calculate your daily calorie intake for cutting, maintaining, or bulking based on BMR, TDEE, and activity level using the Mifflin-St Jeor equation.
  • Daily Protein Intake Calculator
    Calculate your daily protein needs in grams from body weight and activity level (0.8–2.2 g/kg). Free, instant protein intake calculator.
  • Daily Fiber Intake Calculator
    Calculate your recommended daily fiber intake in grams based on your calorie intake, using the 14 g per 1,000 kcal dietary guideline.
  • mL to Grams Calculator
    Convert milliliters (mL) to grams (g) using density. Free volume-to-weight calculator with presets for water, milk, oil, honey, flour and more.
  • Sodium to Salt Calculator
    Convert sodium (mg) to salt (grams) instantly. Multiply sodium by 2.5 to find equivalent table salt (NaCl) for nutrition labels and diet tracking.
  • Running Calories by Distance Calculator
    Estimate the calories you burn running based on your body weight and the distance you cover. Quick, distance-based running energy expenditure calculator.
  • Calories In vs Out Calculator
    Calculate your daily calorie balance (in vs out) using calories consumed, BMR and exercise. See net surplus or deficit and estimated weight change.
  • Grams of Protein Per Meal Calculator
    Convert grams of protein, carbohydrates and fat into calories. Calculate total kcal and macro percentage breakdown using the 4-4-9 Atwater factors.
  • Dog Calories per Cup to Cups per Day Calculator
    Convert your dog's daily calorie needs (MER in kcal) to cups of food per day using the kcal-per-cup density on the bag. Free, instant feeding portion tool.
  • Cat Calories per Can to Cans per Day Calculator
    Calculate how many cans of wet food your cat needs per day. Enter daily calorie needs and kcal per can to get cans per day and per week.
  • Maintenance Calories Calculator
    Calculate your maintenance calories (TDEE) from BMR and activity level using the Mifflin-St Jeor equation. See loss and gain targets too.
  • Calories Burned by Steps Calculator
    Estimate calories burned from your step count, body weight and height. Free calculator using stride length and distance to give kcal burned walking.
  • Percent Daily Value (%DV) Calculator
    Calculate the Percent Daily Value (%DV) of a nutrient from the amount per serving and its recommended daily value. Fast, free %DV nutrition calculator.
  • Bulking & Cutting Calorie Calculator
    Calculate your daily calorie target for bulking, cutting, or maintaining based on your TDEE. Bulk at 110-120% and cut at 75-85% of maintenance.
  • Intermittent Fasting Window Calculator
    Plan your intermittent fasting schedule. Enter your protocol (16:8, 18:6, 20:4, OMAD) and eating start time to get exact eating and fasting windows.
  • Weight Gain Calorie Calculator
    Find how many calories per day you need to gain weight. Calculates your TDEE plus a bulking surplus from your target weekly weight gain.
  • Calories to Kilojoules Calculator
    Convert calories (kcal) to kilojoules (kJ) instantly. Enter food energy in kilocalories and get the kJ value using kJ = kcal × 4.184.
  • Carbohydrate Intake Calculator
    Calculate your daily carbohydrate intake in grams from your total daily calories (TDEE) and target carb percentage. Free, fast carb macro calculator.
  • Daily Protein for Muscle Gain Calculator
    Calculate your daily protein target for muscle gain in grams using 0.7–1.0 g per pound of body weight. Free, fast, and easy to use.

Frequently asked questions

What nutritional values can I calculate here?

You can estimate daily calorie needs, optimal macro splits across carbs, protein, and fat, protein intake targets by body weight, healthy fat intake ranges, and daily water requirements. Pet owners can also calculate appropriate raw food portions, general dog food amounts, and omega-3 dosing for their dogs.

How reliable are the nutritional estimates?

Calculations are based on standard reference formulas and dietary guidelines — for example, protein-per-kilogram norms and established fluid intake recommendations. Results are general estimates, not personalized dietary prescriptions. These tools are NOT a substitute for medical or dietitian advice; consult a qualified healthcare professional for guidance tailored to your specific health needs.

Are the dog nutrition calculators based on veterinary guidelines?

The dog calculators reference common veterinary and pet-nutrition frameworks, such as percentage-of-body-weight guidelines for raw feeding and AAFCO-based nutrient references. They provide a practical starting point, but for animals with health conditions always confirm with your veterinarian.

Do you store the data I enter?

No. All calculations happen in your browser. Nothing you type — your weight, calorie goals, or pet details — is sent to our servers or saved between sessions.

Which nutrition calculators are most popular?

The list is ordered by actual visitor usage, so the tools at the top are genuinely the most-used. Flip to the Trending tab to see which calculators are getting the biggest surge in visits right now, or Recently Added for the newest tools.

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