Estimate your daily calories and protein, carb and fat targets from weight, height, age, sex and activity level, and compare them with a 2,000 calorie label.
lbs
in
Results
Calculated
Daily calories
—
kcal to maintain weight
Vs. 2,000 kcal label
—
% of the label baseline
Protein
—
g per day (20% of calories)
Carbohydrate
—
g per day (50% of calories)
Fat
—
g per day (30% of calories)
BMR
—
kcal at rest
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Your numbers versus the label
Every nutrition facts label is based on a 2,000 calorie reference diet, and the % Daily Value column tells you how much of a nutrient one serving supplies on that diet. Your own needs may be higher or lower. This calculator estimates your daily calories from your body and activity level, splits them into protein, carbohydrate and fat, and shows how your calories compare with the label baseline so you can read % DV more sensibly.
How it is calculated
BMR (Mifflin-St Jeor) = 10 × kg + 6.25 × cm − 5 × age, then +5 for men or −161 for women.
Daily calories = BMR × activity factor (1.2 to 1.9).
Macros use a 20% protein, 50% carbohydrate, 30% fat split. Protein and carbohydrate provide 4 kcal per gram; fat provides 9 kcal per gram.
Label comparison = daily calories / 2,000.
Worked example
A 35-year-old man, 175 lb (79.38 kg), 70 in (177.8 cm), lightly active (defaults). BMR = 793.8 + 1,111.25 − 175 + 5 = 1,735 kcal. Calories = 1,735 × 1.375 = 2,386 kcal, which is 119% of the 2,000 kcal label. Protein = 2,386 × 0.20 / 4 = 119 g, carbohydrate = 2,386 × 0.50 / 4 = 298 g, fat = 2,386 × 0.30 / 9 = 80 g.
Common mistakes
Overstating activity. Most people overestimate exercise; when unsure, choose the lower level.
Treating % DV as a personal target. It is based on 2,000 kcal, so scale it to your own calories.
Forgetting these are maintenance calories. To lose or gain weight, adjust by a modest amount such as 250 to 500 kcal.
Frequently Asked Questions
What does % Daily Value mean?
It shows how much one serving contributes to a daily total on a 2,000 calorie diet. 5% or less is low and 20% or more is high for a nutrient.
Are the macro percentages fixed?
Yes, this tool uses a common 20/50/30 protein, carbohydrate and fat split. Dietary guidelines allow wider ranges, such as 10 to 35% protein.
How accurate is the calorie estimate?
Mifflin-St Jeor is usually within about 10% for healthy adults. Treat it as a starting point and adjust based on real weight changes over a few weeks.
Why is my number different from the label?
The label uses a single generic diet of 2,000 kcal. Your size, age and activity shift your needs above or below it.
Practical Guide for Nutrition Label Calculator
Nutrition Label Calculator is most useful when the inputs reflect the situation you are actually planning around, not a best-case estimate. Treat the result as a decision aid: it gives you a structured way to compare assumptions, spot outliers, and decide what to verify next. For Health work, the most important review lens is baseline behavior, consistency, measurement conditions, recovery, and realistic adherence.
Start with a baseline run using values you can defend. Then change one assumption at a time and watch which output moves the most. If one input dominates the result, spend your verification time there first. If several inputs have similar influence, use a conservative scenario and an optimistic scenario to create a practical range instead of relying on a single exact number.
Before acting on the result, compare the result with recent logs and professional guidance when the topic affects medical, nutrition, or training decisions. This is especially important when the calculator supports a purchase, project plan, performance target, or operational decision. The calculator can make the math consistent, but the quality of the conclusion still depends on current data, clear units, and assumptions that match your real constraints.
When the output looks surprising, slow down and inspect each input in order. A small change in one high-leverage field can move the final number more than several low-leverage fields combined. For Nutrition Label Calculator, that means you should first confirm the value with the greatest scale, then confirm the value with the greatest uncertainty, then rerun the calculator with conservative and optimistic assumptions. This sequence turns the calculator from a single answer into a practical decision range.
Review Checklist
Confirm every input uses the unit and time period requested by the calculator.
Run a low, expected, and high scenario so the answer has a useful range.
Check whether rounding or a missing decimal place changes the decision.
Update the calculation weekly for habit tracking and whenever sleep, activity, medication, diet, or schedule changes.