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.

  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • Grams to Cups Converter (Flour & Sugar)
    Convert grams to cups for flour, sugar and more. Choose your ingredient and get an instant, accurate cup measurement plus tablespoons.
  • Keto Macro Calculator
    Calculate your daily keto macros in grams. Enter calories and your fat/protein/carb percentages to get fat, protein and carb targets for a ketogenic diet.
  • Salt to Sodium Converter
    Convert grams of salt to milligrams of sodium instantly. 1 g of salt equals 393.4 mg of sodium — track your daily sodium intake easily.
  • Pregnancy Water Intake Calculator
    Estimate your daily water needs during pregnancy or breastfeeding based on body weight and exercise. Get results in liters, cups and fluid ounces.
  • Carb to Insulin Ratio (Bolus) Calculator
    Estimate a mealtime insulin bolus from carbs, your carb ratio (ICR), current and target blood glucose, and insulin sensitivity factor (ISF).
  • Calories Per Serving Calculator
    Calculate calories per serving by dividing total recipe calories by the number of servings. Free, instant per-portion calorie calculator for any recipe.
  • Macronutrient Calculator
    Convert your daily calorie target and macro percentage split into grams of protein, carbohydrates, and fat per day. Free macro calculator.

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.

Categories