TDEE calculator form for fitness coaches

Try it yourself

This is a real, working CalcForms calculator, right here on the page. Enter your details and watch the estimate update on the spot. It is exactly what your customers would use, and every submission reaches you as a lead.

forms.badabingapp.cc/tdee-calculator

What your customer answers

The live form above asks for these, in this order.

Their email, so the lead reaches you
Sex: Male, Female
Age: a number
Current weight (lb): a number
Height (in): a number
Activity level: Sedentary, Lightly active, Moderately active, Very active

What they see: Your daily calories and macros, Protein (g), Carbs (g) and Fat (g), worked out from their answers on the spot.

What it calculates

Mifflin-St Jeor BMR with your own activity multipliers for four activity levels
Protein, carbs, and fat split set to your exact coaching philosophy
Client sees their numbers live, so more of them convert to a consult
Stop DM-ing screenshots of a Numbers file to every new lead
Pre-calculated lead with email, ready to follow up

Why it closes more deals

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A live number closes deals

Customers who see a real estimate the second they enter their details are far likelier to book than ones told to call for a quote. The number is the hook.

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Runs your most complex spreadsheet

Multi-tab workbooks, lookup tables, tiered rates, conditional line items, the lot. If the math runs in Excel, CalcForms runs it behind a clean form.

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Update it by chatting

Prices move. Ask ChatGPT to change a rate, add an option, or insert a step and the live form updates in seconds. No developer, no redeploy.

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Backtest before you publish

Run your last 20 real jobs through it and tune the formula until the live estimate matches what you actually charge. Ship it once it lines up.

Why calculator forms are worth it, by the numbers

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47.3% vs 2.8%

In an analysis of 50,000+ forms, interactive forms averaged a 47.3% conversion rate versus 2.8% for static forms. (Outgrow)

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51% of buyers

51% of B2B software buyers now begin their research in an AI chatbot rather than a search engine. (G2, 2026)

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1 in 3

A third of B2B buyers have chosen a vendor they had never heard of before, on an AI assistant's recommendation. (G2, 2026)

How this form was built

No template builder and no code. One message to ChatGPT with CalcForms added:

✦ ChatGPT with CalcForms

Build a TDEE calculator form. Inputs: sex (male, female), age, weight in pounds, height in inches, activity level (sedentary, lightly active, moderately active, very active). Calculate BMR with Mifflin-St Jeor, multiply by my activity factors (1.2 to 1.725), then split into 0.8g protein per pound, 45% of calories from carbs, 25% from fat. Show the client calories and macros live. Capture their email.

Done. I built TDEE Calculator with your pricing and deployed it to forms.badabingapp.cc. Every submission is saved with the inputs, the results and the email. Want to add a field or change a rate? Just tell me.

Build this exact form

CalcForms is an app you add to ChatGPT once. After that you build and edit forms just by chatting. Works in Claude too.

Add CalcForms to ChatGPT. Open the CalcForms app page, click Install plugin, and sign in with your email. One time, about 60 seconds. A free ChatGPT account works. (Using Claude? Setup here.)
Say the words below. ChatGPT builds the form with your math inside and gives you a link.
Share it, then change it by asking. Send the link to customers. Change a rate or add a question later just by asking.

Step-by-step: turn your spreadsheet into a form, add your price list, show customers one number. All guides →

Say this to ChatGPT

"Build a TDEE calculator form. Inputs: sex (male, female), age, weight in pounds, height in inches, activity level (sedentary, lightly active, moderately active, very active). Calculate BMR with Mifflin-St Jeor, multiply by my activity factors (1.2 to 1.725), then split into 0.8g protein per pound, 45% of calories from carbs, 25% from fat. Show the client calories and macros live. Capture their email."

How does it work? CalcForms is an official ChatGPT app. Once it is added, ChatGPT can build, publish and update real calculator forms for you, all from the chat window. Your customers never need ChatGPT; they just open a link.

What it works out

Daily calorie needs
Activity level
Protein target
Carbs and fat split

Last updated 6 October 2026

FAQ

Can I use my own activity multipliers and macro split?

Yes. Tell ChatGPT your exact factors, like 1.55 for moderate and 1.2g protein per pound at 30% fat. It writes the formulas. If your method changes later, you adjust the form by chatting and the URL stays the same.

Does the client see their result, or just me?

They see calories and macros live, which is what turns a curious visitor into a booked call. Any internal coaching notes are never shown on the form. You choose per field what shows.

Can I gate the macros behind an email?

Yes. Make email required so the full split only appears after they submit. Every pre-calculated lead reaches you in ChatGPT, or in the web portal on Pro, so you can follow up while they are still motivated.

Does it handle metric units?

Yes. Add a kg and cm toggle as an input, or build a separate metric version. ChatGPT handles the conversions inside the formula.

Build yours in the next 10 minutes.

Free in ChatGPT, unlimited forms and submissions. No credit card.

Add to ChatGPT, free →