For gyms, coaches & PTs

Free calculators for your website

Give your members and clients useful tools without building them. Paste one line of code and any of our calculators appears on your page, in kg or lb, on any device.

What you get: free forever · no ads · no sign-up · no cookies or tracking in the embed · updates automatically when we improve it. The only thing we ask is that you keep the small “by Gymex Fitness” credit under the calculator.

How to add one

Copy the embed code for the calculator you want.
Paste it into your page. In WordPress, use a Custom HTML block. In Squarespace, use a Code block. In Wix, use Embed code → Embed HTML. Webflow’s Embed element also works.
Publish. That’s it. Adjust height if your layout needs it.

Strength

1RM calculator

Estimate your one-rep max from any set, with five formulas and a full percentage chart. Preview · Full page

<iframe src="https://gymex.fitness/embed/one-rep-max-calculator.html" title="One rep max (1RM) calculator by Gymex Fitness" width="100%" height="1150" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Autoregulation

RPE & RIR calculator

Turn any set at a given RPE into an e1RM, then find the load for your next target reps and RPE. Preview · Full page

<iframe src="https://gymex.fitness/embed/rpe-calculator.html" title="RPE calculator and RIR chart by Gymex Fitness" width="100%" height="660" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Gym floor

Barbell plate calculator

Which plates go on each side of the bar for any target weight, in kg or lb. Preview · Full page

<iframe src="https://gymex.fitness/embed/plate-calculator.html" title="Barbell plate calculator by Gymex Fitness" width="100%" height="560" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Powerlifting

DOTS & IPF GL calculator

Score your squat, bench and deadlift total against your bodyweight with DOTS and IPF GL points. Preview · Full page

<iframe src="https://gymex.fitness/embed/dots-calculator.html" title="DOTS calculator and IPF GL points by Gymex Fitness" width="100%" height="580" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Nutrition

TDEE & macro calculator

Estimate your daily calories and protein, fat and carb targets for cutting, maintaining or building muscle. Preview · Full page

<iframe src="https://gymex.fitness/embed/tdee-macro-calculator.html" title="TDEE and macro calculator for lifters by Gymex Fitness" width="100%" height="840" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Programming

5/3/1 calculator

Your training max and every set of a full 5/3/1 cycle, rounded to the plates you have. Preview · Full page

<iframe src="https://gymex.fitness/embed/531-calculator.html" title="5/3/1 calculator by Gymex Fitness" width="100%" height="740" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Gym floor

Warm-up set calculator

A ramp of warm-up sets from the empty bar to your working weight, with sensible reps. Preview · Full page

<iframe src="https://gymex.fitness/embed/warm-up-calculator.html" title="Warm-up set calculator by Gymex Fitness" width="100%" height="640" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Body composition

Body fat calculator

Estimate body fat with the U.S. Navy tape-measure method, plus lean and fat mass. Preview · Full page

<iframe src="https://gymex.fitness/embed/body-fat-calculator.html" title="Body fat calculator (U.S. Navy method) by Gymex Fitness" width="100%" height="660" style="border:0;border-radius:16px;max-width:720px" loading="lazy"></iframe>

Questions

Is it really free?

Yes. There’s no fee, no account and no ads. The calculators are part of how people discover Gymex, our AI gym app, so the small credit link is the only “cost”.

Does the embed track my visitors?

No. The embedded calculator sets no cookies and loads no analytics or ad scripts. Calculations run entirely in the visitor’s browser.

Can you make one for my gym’s brand or a calculator you don’t list?

Possibly. Get in touch and tell us what your members need.

Free calculators for your website

How to add one

1RM calculator

RPE & RIR calculator

Barbell plate calculator

DOTS & IPF GL calculator

TDEE & macro calculator

5/3/1 calculator

Warm-up set calculator

Body fat calculator

Questions

Is it really free?

Does the embed track my visitors?

Can you make one for my gym’s brand or a calculator you don’t list?

Want the full coaching experience?