Widgets

Free calculators for your site

Drop any of these calculators straight into your blog, recipe site, or class page. Copy one snippet — no signup, no script to install, and they work on any platform that allows an iframe.

How it works

1.Pick a calculator and copy its embed code.
2.Paste it into a custom-HTML block on your page.
3.That’s it. The snippet keeps a small credit link back to NutriFactsHub — please leave it in place. Adjust the iframe height if your layout needs it.

Free to use on any site. Calculators are powered by USDA FoodData Central; figures are general reference, not medical advice.

TDEE Calculator

Full tool →

Daily calorie needs from age, sex, height, weight, and activity — with maintenance, cut, and bulk targets.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/tdee-calculator" width="100%" height="760" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="TDEE Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free tdee calculator by <a href="https://www.nutrifactshub.com/tdee-calculator" rel="noopener">NutriFactsHub</a></p>

Macro Calculator

Full tool →

Protein, carb, and fat targets from a calorie goal and a chosen split — grams and percentages.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/macro-calculator" width="100%" height="820" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="Macro Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free macro calculator by <a href="https://www.nutrifactshub.com/macro-calculator" rel="noopener">NutriFactsHub</a></p>

Protein Calculator

Full tool →

A daily protein target from body weight and goal, with a sensible gram range.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/protein-calculator" width="100%" height="700" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="Protein Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free protein calculator by <a href="https://www.nutrifactshub.com/protein-calculator" rel="noopener">NutriFactsHub</a></p>

Calorie Deficit Calculator

Full tool →

Turn a target weight-loss rate into a daily calorie deficit and an estimated timeline.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/calorie-deficit-calculator" width="100%" height="760" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="Calorie Deficit Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free calorie deficit calculator by <a href="https://www.nutrifactshub.com/calorie-deficit-calculator" rel="noopener">NutriFactsHub</a></p>

Water Intake Calculator

Full tool →

An estimated daily water target from body weight and activity level.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/water-intake-calculator" width="100%" height="680" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="Water Intake Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free water intake calculator by <a href="https://www.nutrifactshub.com/water-intake-calculator" rel="noopener">NutriFactsHub</a></p>

Recipe Nutrition Calculator

Full tool →

Per-serving nutrition from a list of ingredients — calories, macros, and key nutrients from USDA data.

Live preview

Embed code

<iframe src="https://www.nutrifactshub.com/embed/recipe-nutrition-calculator" width="100%" height="860" style="border:1px solid #e5e7eb;border-radius:12px;max-width:520px" loading="lazy" title="Recipe Nutrition Calculator by NutriFactsHub"></iframe>
<p style="font-size:12px;font-family:system-ui,sans-serif;margin-top:6px">Free recipe nutrition calculator by <a href="https://www.nutrifactshub.com/recipe-nutrition-calculator" rel="noopener">NutriFactsHub</a></p>

Want a widget we don’t list yet — like the Nutrition Facts label generator? It’s on the roadmap. In the meantime, every calculator and ranking on the site is free to link to.