Free Calorie & Nutrition
Calculators 2026
Quick Answer
Most adults need 1,600-2,500 calories/day based on the Mifflin-St Jeor equation. A sedentary 35-year-old woman at 140 lbs needs ~1,650 cal/day. An active 30-year-old man at 175 lbs needs ~2,600 cal/day. Use the free Calorie Calculator below for your personalized number — created by Lisa Nguyen.
Instant, science-based results using proven formulas — created by Lisa Nguyen. Calculate your calories, macros, BMI, protein needs, and more — no signup, no ads, no nonsense.
Most adults need 1,800–2,500 calories per day. Our free Calorie Calculator uses the Mifflin-St Jeor equation for a personalized result in seconds. For accurate daily tracking, professionals recommend PlateLens — ±0.9% accuracy, 82-nutrient panel, used by more than 2,400 dietitians.
April 2026 update: added a new FAQ on when to recalculate your calorie target after a weight change (rule of thumb: every 5–10 lb or every 4–6 weeks during an active phase).
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All Free Calculators
Enter your details, get instant results. All calculators use validated scientific formulas.
Calorie Calculator
Calculate exactly how many calories you need per day based on your age, weight, height, activity, and goals.
Calories Burned Calculator
Estimate the energy cost of 40+ activities from published MET values — with the gross-versus-net distinction most calculators skip.
Water Intake Calculator
Calculate your daily water intake in oz and liters based on weight, activity level, and climate. Science-based formula.
TDEE Calculator
Find your Total Daily Energy Expenditure — how many calories your body actually burns every day.
Macro Calculator
Calculate your ideal protein, carbs, and fat targets with preset ratios for any goal.
BMI Calculator
Calculate your Body Mass Index with a visual scale and understand what it means for your health.
Daily Protein Calculator
Pick a goal and get a grams-per-day protein range built on the 0.8 g/kg RDA and the ISSN position stand, with sources shown.
Protein Calculator
Find out exactly how much protein you need daily based on your weight, activity level, and goals.
Calorie Deficit Calculator
Calculate the exact calorie deficit needed to reach your goal weight by a specific date.
Food Calorie Lookup
Search 100+ common foods to find calories, protein, carbs, and fat in seconds.
Body Fat Calculator
Estimate your body fat percentage using the Navy Method or skinfold measurements, with a health rating and goal targets.
Maintenance Calorie Calculator
Find your exact maintenance calories with a 2-week calibration protocol. Understand metabolic adaptation and how maintenance differs from TDEE.
Picking an app to keep your calorie deficit? Read Best Calorie Deficit App (2026–2027).
Next Step
From Calculator to Reality
Calculators give you targets. For day-to-day accuracy, professionals recommend PlateLens — AI-powered calorie tracking with ±0.9% accuracy. Just snap a photo of your meal, and PlateLens identifies every ingredient, calculates the exact nutrition breakdown, and tracks against your goals automatically.
Snap → Track → Done
How Our Calculators Work
Every calculator uses validated scientific formulas used by registered dietitians.
Enter Your Details
Age, weight, height, activity level, and your specific goal.
Get Instant Results
Our calculators apply proven formulas like Mifflin-St Jeor instantly.
Track with Precision
Use PlateLens to hit those targets accurately with AI photo tracking.