DRI Calculator (Dietary Reference Intakes)

A DRI calculator gives you the Dietary Reference Intakes for your age, sex and life stage: the Recommended Dietary Allowance (RDA) or Adequate Intake (AI) for each nutrient, the Tolerable Upper Intake Level (UL) you should not regularly exceed, and ranges for protein, carbohydrate and fat. The values come from the US National Academies of Sciences, Engineering, and Medicine (NASEM) and are used by dietitians in the US and Canada.

National Academies DRI tables
RDA, AI and UL
Pregnancy and breastfeeding

— protein RDA

Use the calculator above for your own numbers. Below, we explain how the DRI calculator works, with worked examples and sources.

What are Dietary Reference Intakes?

Dietary Reference Intakes (DRIs) are a set of nutrient reference values published by the National Academies to guide healthy eating for specific age and sex groups. DRI is the umbrella term; it contains several different values, each with its own job:

Value	What it means	How to use it
EAR – Estimated Average Requirement	Meets the needs of half of healthy people in a group	Used by researchers to assess groups, not individuals
RDA – Recommended Dietary Allowance	Meets the needs of about 97–98% of healthy people	A daily target for individuals
AI – Adequate Intake	Set when there is not enough evidence for an RDA	Use as a target; it is likely to be adequate
UL – Tolerable Upper Intake Level	Highest daily intake unlikely to cause harm	A ceiling – mainly relevant for supplements and fortified foods
CDRR – Chronic Disease Risk Reduction intake	Intake above which lowering reduces chronic disease risk (so far set for sodium)	Sodium: reduce if above 2,300 mg a day
AMDR – Acceptable Macronutrient Distribution Range	Healthy share of calories from protein, carbs and fat	Plan meals within these ranges

Adult DRI values (ages 19–50)

Nutrient	Men	Women	Pregnancy	Breastfeeding	UL (adults)
Protein (RDA)	0.8 g/kg (≈56 g)	0.8 g/kg (≈46 g)	1.1 g/kg (≈71 g)	1.3 g/kg (≈71 g)	—
Carbohydrate (RDA)	130 g	130 g	175 g	210 g	—
Fibre (AI)	38 g	25 g	28 g	29 g	—
Vitamin A (RDA)	900 mcg RAE	700 mcg RAE	770 mcg	1,300 mcg	3,000 mcg (preformed)
Vitamin C (RDA)	90 mg	75 mg	85 mg	120 mg	2,000 mg
Vitamin D (RDA)	15 mcg (600 IU)	15 mcg (600 IU)	15 mcg	15 mcg	100 mcg (4,000 IU)
Vitamin B12 (RDA)	2.4 mcg	2.4 mcg	2.6 mcg	2.8 mcg	—
Folate (RDA)	400 mcg DFE	400 mcg DFE	600 mcg DFE	500 mcg DFE	1,000 mcg (from supplements/fortified food)
Calcium (RDA)	1,000 mg	1,000 mg	1,000 mg	1,000 mg	2,500 mg
Iron (RDA)	8 mg	18 mg	27 mg	9 mg	45 mg
Magnesium (RDA, 31–50)	420 mg	320 mg	350–360 mg	310–320 mg	350 mg (supplements only)
Zinc (RDA)	11 mg	8 mg	11 mg	12 mg	40 mg
Iodine (RDA)	150 mcg	150 mcg	220 mcg	290 mcg	1,100 mcg
Potassium (AI)	3,400 mg	2,600 mg	2,900 mg	2,800 mg	—
Sodium (AI / CDRR)	1,500 mg / 2,300 mg	1,500 mg / 2,300 mg	same	same	—
Choline (AI)	550 mg	425 mg	450 mg	550 mg	3,500 mg
Total water (AI)	3.7 L	2.7 L	3.0 L	3.8 L	—

Pregnancy and breastfeeding values shown are for ages 19–50. Values for teenagers, children and adults over 50 differ – the calculator switches automatically. Key changes after 50: calcium rises to 1,200 mg for women from 51 and men from 71, vitamin D to 20 mcg (800 IU) from 71, and women's iron falls to 8 mg after menopause.

How to calculate your dietary reference intake

Find your age band and sex in the NASEM tables (the calculator does this).
Add life stage – pregnancy or breastfeeding changes many values.
Work out protein from body weight: 0.8 g/kg for adults. A 75 kg adult needs about 60 g a day.
Work out fibre from calories: 14 g per 1,000 kcal, or the fixed AI for your group.
Check supplements against the UL – food alone rarely exceeds it, but high-dose products can.

Macronutrient ranges (AMDR)

Macronutrient	Adult range (% of calories)	On 2,000 kcal
Protein	10–35%	50–175 g
Carbohydrate	45–65%	225–325 g
Fat	20–35%	44–78 g

The protein RDA is a minimum to prevent deficiency, not an optimum. Many older adults and athletes are advised to eat more – often 1.0–1.6 g/kg or higher – which still fits inside the AMDR.

DRI vs Daily Value on food labels

The % Daily Value (%DV) on US Nutrition Facts labels uses one fixed reference amount per nutrient for everyone aged 4 and over, chosen mostly from the highest RDA or AI across age groups. DRIs are personal to your age, sex and life stage.

Nutrient	Label Daily Value	DRI example
Calcium	1,300 mg	1,000 mg for adults 19–50
Iron	18 mg	8 mg for men; 18 mg for women 19–50
Vitamin D	20 mcg	15 mcg for adults 19–70
Potassium	4,700 mg	3,400 mg men / 2,600 mg women
Fibre	28 g	38 g men / 25 g women 19–50

Using DRIs during weight loss

Eating less food makes it harder to reach your vitamin and mineral targets. During a calorie deficit, focus on nutrient-dense foods – vegetables, fruit, legumes, whole grains, lean protein and dairy or fortified alternatives – and keep protein at or above the RDA to help preserve muscle. Fibre, potassium, calcium, iron and vitamin D are the nutrients most often low in restrictive diets. Very low-calorie diets should be supervised by a health professional.

Pregnancy and breastfeeding

Needs rise for protein, folate, iron, iodine, choline and several other nutrients. Folate matters most before and in early pregnancy: US guidance recommends 400 mcg of folic acid daily from supplements or fortified food for anyone who could become pregnant, alongside a varied diet. Iron needs jump to 27 mg in pregnancy, which is hard to meet from food alone – prenatal supplements are common, but take them on your clinician's advice.

Who uses DRIs?

Dietitians use DRIs to plan diets and assess intakes; food scientists use them to formulate fortified products; researchers use EARs to judge whether populations eat enough. For individuals, comparing your typical intake with your RDA or AI is a quick way to spot nutrients worth paying attention to – a food diary app plus this calculator is a good start, and a registered dietitian can interpret results in more depth.

Nutrients many people fall short on

The Dietary Guidelines for Americans 2020–2025 identify calcium, potassium, dietary fibre and vitamin D as nutrients of public health concern because many people do not get enough of them. Iron is a particular concern for adolescent girls, women who could become pregnant and pregnant women. If your intake is low for any of these, food sources are the first step:

Nutrient	Good food sources
Calcium	Milk, yoghurt, cheese, fortified plant drinks, tofu set with calcium, canned fish with bones
Potassium	Beans and lentils, potatoes, bananas, dried apricots, leafy greens, yoghurt
Fibre	Whole grains, beans, lentils, vegetables, fruit, nuts and seeds
Vitamin D	Oily fish, eggs, fortified milk and cereals; sunlight; supplements where advised
Iron	Red meat, poultry, fish, beans, fortified cereals – pair plant sources with vitamin C

Supplements and upper limits

Upper limits apply to total intake from food, drinks and supplements, but for a few nutrients – magnesium, folic acid and niacin, for example – the UL refers only to supplements and fortified foods. Taking several products that contain the same nutrient is the most common way people exceed a UL. Check labels, and talk to a pharmacist or doctor before taking high-dose supplements, especially vitamin A, vitamin D, iron or zinc.

Sources

National Academies – Dietary Reference Intakes summary tables – nationalacademies.org / ncbi.nlm.nih.gov/books/NBK545442
NIH Office of Dietary Supplements – Nutrient fact sheets — ods.od.nih.gov
NASEM (2019) DRIs for Sodium and Potassium — nap.edu
FDA – Daily Value on the Nutrition and Supplement Facts labels — fda.gov

General reference values for healthy people, not medical advice. People with health conditions, pregnant people and those taking medicines should get personal advice from a doctor or registered dietitian. Last reviewed: 18 October 2026.

Written & built by

Zeeshan Nawaz

Calculator Developer · Tuff Search

Builds and tests Tuff Search calculators, turning official tax tables and published formulas into tools anyone can check.

FAQ

Frequently asked questions

Quick answers about the DRI calculator.

A DRI calculator looks up your Dietary Reference Intakes – RDA or AI and UL for each nutrient – based on your age, sex and life stage, and calculates weight-based values such as protein.

Still have a question? Email support@tuffsearch.com

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