Nutrition Resources
Curated links to the best nutrition databases, official guidelines, and evidence-based information to support your health journey.
Our Free Calculators
TDEE Calculator
Calculate your Total Daily Energy Expenditure to understand how many calories you burn each day.
Macro Calculator
Calculate your optimal protein, carbohydrate, and fat intake based on your goals.
Protein Calculator
Calculate how much protein you need daily based on your body weight and activity level.
Calorie Deficit Calculator
Calculate a safe calorie deficit for sustainable weight loss.
Body Fat Calculator
Estimate your body fat percentage using the Navy method or measurements.
Recipe Calorie Calculator
Calculate the nutrition facts for your homemade recipes and meals.
Food & Calorie Databases
Look up nutrition information for any food, from whole ingredients to restaurant meals.
USDA FoodData Central
USDASearch 380,000+ foods with detailed nutrition data. The gold standard for food composition information.
CalorieKing
CalorieKingQuick calorie lookup for restaurant meals, fast food, and popular brands.
MyFoodData
MyFoodDataFree nutrition tools and food lists organized by nutrient content.
Nutritionix Food Search
NutritionixDatabase of 800,000+ grocery items and restaurant foods with verified nutrition info.
Official Guidelines & Tools
Authoritative resources from government health agencies and professional organizations.
Dietary Guidelines for Americans
USDAOfficial science-based nutrition guidance updated every 5 years by USDA and HHS.
Nutrition.gov
USDAGateway to reliable government information on nutrition, healthy eating, and food safety.
Body Weight Planner
NIHCalculate how many calories to eat to reach your goal weight by a specific date.
Find a Registered Dietitian
Academy of Nutrition and DieteticsSearch for credentialed nutrition experts in your area for personalized guidance.
Learn from Experts
Evidence-based nutrition education from universities, researchers, and credentialed professionals.
The Nutrition Source
HarvardEvidence-based nutrition guidance from Harvard T.H. Chan School of Public Health.
Examine.com
ExamineIndependent, unbiased research on supplements and nutrition. No ads, no sponsors.
Precision Nutrition
Precision NutritionFree articles on nutrition science, behavior change, and sustainable eating habits.
British Nutrition Foundation
BNFImpartial, evidence-based information on food and nutrition from UK experts.
From Our Blog
Practical guides and tips for making calorie tracking work for you.
The Complete Guide to Calorie Counting
Everything you need to know about calorie counting, from the basics to practical tips for success.
How to Track Calories at Restaurants
Practical strategies for estimating and tracking calories when dining out.
These external resources are provided for informational purposes. Calvin is not affiliated with these organizations. For personalized nutrition advice, consult a registered dietitian or healthcare provider.