No. It converts percentages to grams and shows population ranges.
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Split calories into protein, carbohydrates and fat using AMDR ranges.
The calculator turns a calorie target into grams of protein, carbohydrates and fat using the AMDR (Acceptable Macronutrient Distribution Ranges) from the Dietary Reference Intakes. It picks the range by age, 1 to 3 years, 4 to 18 years and adults, starts from the midpoint of each range by default, and lets you adjust the percentages within the acceptable limits. The conversion is direct: grams = calories × percentage ÷ energy per gram, with 4 kcal/g for protein and carbohydrate and 9 kcal/g for fat. For each macro the tool shows the minimum and maximum of the AMDR range and the value you selected; the percentages you choose are clamped to the ends of each age's range, and the calorie field accepts 800 to 6,000 kcal per day. It does not estimate your calories or build a menu, the calorie total comes from a TDEE estimate or a professional. It is educational material, not a nutrition prescription.
AMDR are macronutrient distribution ranges defined by the Dietary Reference Intakes to reduce the risk of nutrient inadequacy and chronic disease in the healthy population. The tool selects the range by age and, by default, uses the midpoint of each interval.
The conversion to grams uses the energy of each macronutrient: protein and carbohydrate provide 4 kcal per gram and fat provides 9 kcal per gram. So multiplying calories by the percentage and dividing by that value gives the grams for the day.
Example 1, an adult on 2,000 kcal at the midpoint (protein 22.5%, carbohydrate 55%, fat 27.5%): that comes out near 113 g of protein, 275 g of carbohydrate and 61 g of fat per day.
Example 2, an adult on 2,500 kcal with a higher-protein split inside the AMDR (protein 30%, carbohydrate 45%, fat 25%): around 188 g of protein, 281 g of carbohydrate and 69 g of fat. Both examples stay within the acceptable ranges; what changes is the emphasis, not the validity.
Staying inside the AMDR range does not guarantee diet quality: fiber, micronutrients, whole foods, hydration, cultural context and individual health still matter. The range is population-wide and deliberately broad to accommodate very different eating patterns.
Some situations call for professional support and may fall outside the general ranges, kidney disease, diabetes, pregnancy, lactation, competitive sport or a history of an eating disorder. Use the numbers as a basis for a conversation with a dietitian, not as a prescription.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/macro-calculator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Macro Calculator"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
No. It converts percentages to grams and shows population ranges.
Nutrition disclaimer: educational tool only. Macro distribution does not replace a dietitian, especially with kidney disease, diabetes, pregnancy, lactation, competitive sport or eating-disorder history.
| Macro | Selected | AMDR range |
|---|---|---|
| Protein | 110 g · 20% | 10–35% · 55–193 g |
| Carbohydrates | 275 g · 50% | 45–65% · 248–358 g |
| Fat | 73 g · 30% | 20–35% · 49–86 g |
Grams use kcal/g: protein and carbohydrate 4 kcal/g, fat 9 kcal/g. AMDR ranges are population guidance, not an individualized diet.
Macros = calories × percentage ÷ kcal per gram. AMDR: carbohydrates 45–65%; protein and fat vary by age.
Calories and preferences stay in your browser and are not sent to analytics.