Free-to-use tool

Embed the NEAT calculator on your site

A free calculator, no sign-up, that you can add to your blog or website with one line of code.

NEAT (Non-Exercise Activity Thermogenesis) is the most variable brick of calorie expenditure: up to 700 kcal per day of difference between two people of the same weight (Levine 2005). Most online calculators estimate it with a declarative activity factor. This one starts only from measurements: weight, height, body fat and real step count.

Demo

The embed code

Copy and paste this line into your article, where you want the calculator to appear:

<iframe src="https://lean-app.com/widget/neat/" width="100%" height="720" style="border:0;max-width:560px" loading="lazy" title="NEAT calculator"></iframe>

What you can do with it

  • Free use, including on a commercial site, without asking us for permission.
  • No third-party script loaded on your side: the calculator lives in an isolated iframe, it does not slow down your page and sets no advertising cookie.
  • Responsive : it adapts to the width of your content, up to 560 px.
  • No sign-up required from your readers to get their result.
Only constraint: keep the credit link to lean-app.com displayed under the calculator. That is what allows us to keep it free.

The formula used

It is public, you can check it:

  • Estimated stride = 0.414 x height
  • Cost of one step = weight x stride x 0.000722 (derived from 3.3 MET, Ainsworth 2011 compendium)
  • Step NEAT = cost of one step x number of steps
  • Lean mass = weight x (1 − body fat)
  • Basal metabolic rate = 370 + 21.6 x lean mass

The results are identical to those of our full NEAT calculator, which also details the share of NEAT in non-exercise expenditure and offers benchmarks by step volume.

Frequently asked questions

Is the widget really free?

Yes, with no condition and no traffic limit. There is no paid version, no account to create, no display quota.

Does it slow down my site?

No. The calculator is loaded with lazy loading in an isolated iframe: it only loads when the reader reaches it, and it runs no script on your page.

Can I change the colors?

The widget is provided as is to guarantee the consistency of the displayed results. If you need a custom integration, write to us from the support page of the site.

Where does the scientific data come from?

From the Ainsworth 2011 compendium for the energy cost of walking in MET, and from Levine's work (2002, 2005) on the magnitude and variability of NEAT. The full formula is published above.