A free, evidence-based tool to help anyone understand their personal daily nutrient needs — calories, vitamins, minerals — without the clinical complexity.
DRI Calculator is a free online tool that calculates personalized Dietary Reference Intakes — daily calorie, macronutrient, vitamin, and mineral targets — based on a user's age, sex, weight, height, and activity level. We pull the underlying data from the National Academies of Sciences, Engineering, and Medicine (NASEM), the official source of nutrient reference values for the United States and Canada.
Alongside the calculator, we publish plain-English guides that explain what your results actually mean — the difference between DRI and RDA, why nutrient needs change with age, how to use a calorie deficit for weight loss without losing nutrition, and so on.
The official government DRI tools work, but they look like they were built in 2005. They aren't mobile-friendly. They don't explain anything. They assume you already know what an RDA is.
We built DRI Calculator because we believe a person searching "how much iron do I need" should get a clear answer — fast, free, on any device, with enough context to actually use the number. No login. No paywall. No upsell to supplements.
DRI Calculator is produced by a small editorial team of researchers and writers. We don't claim medical credentials — instead, our work is built entirely on data published by authoritative public bodies: NASEM, the NIH Office of Dietary Supplements, the USDA, and Health Canada. Every number in the calculator and every claim in our articles traces back to a peer-reviewed paper or government source listed in our methodology below.
Our editorial process is straightforward: we read the primary source, summarize what it says in plain English, double-check the numbers, and cite where each value came from. Articles are signed "By The DRI Calculator Team" because that reflects how the content is actually produced — collaboratively, from official sources, without inventing expertise we don't have.
If we ever bring on a registered dietitian or medical reviewer in the future, we'll name them explicitly and link to their credentials. Until then, we want to be honest about what this site is and isn't.
Every value in our calculator and every guide on this site is built from these five authoritative sources:
We review and update content as new editions of the source data are published. When a number changes — like the 2010 vitamin D revision — we update our calculator and articles to match.
This site is general nutrition education. It's not a substitute for a registered dietitian or physician. If you have a medical condition, talk to a professional.
No affiliate links to vitamins. No "recommended brands." Our calorie deficit suggestions aren't selling you anything.
No display ads, no sponsored content, no pop-ups. The tool stays free because it's built simply, not because you're the product.
The calculator runs entirely in your browser. We don't collect or save the age, weight, or health goals you enter.
Questions, corrections, or feedback? Visit our Contact page and send us a message. We read every message, and if you find an error in our data or articles, we'll fix it and credit you if you'd like.
Free, instant results — your personalized calories, macros, vitamins, and minerals.
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