Scroll any fitness coach's DMs and the same message repeats on a loop: "How many calories should I be eating?" You type out a thoughtful answer, they say thanks, and then they Google "TDEE calculator" anyway and end up on a site plastered with supplement banners — a site that now has the traffic your content earned.
Here's the frustrating part: you already own better math. The spreadsheet where you program clients — the one with your activity multipliers, your protein-per-pound targets, your deficit and surplus rules — is more personalized than anything those ad farms serve. It's just locked in a tab only you can see.
Publish it. A calculator with your name on it takes age, weight, height, activity level, and goal, and hands back daily calories plus a macro split — after collecting an email. The follower gets a real answer built on your methodology; you get a subscriber whose goal you already know. And a lead who told you they're cutting is a completely different first message than one who's bulking.
Upload the sheet as-is — Google Sheets or Excel, formulas intact. You need input cells, output cells, and a fresh Leads tab:
| Cell | Example value |
|---|---|
| Age (input) | 34 |
| Weight (input) | 172 lb |
| Height (input) | 5'9" |
| Activity level (input) | Trains 4x/week |
| Goal (input) | Fat loss |
| Daily calories (output) | 2,150 |
| Protein (output) | 165 g |
| Carbs (output) | 200 g |
| Fat (output) | 72 g |
If your goal adjustments live in your head instead of in cells, add a small lookup — fat loss shaves 15%, muscle gain adds 10%, whatever your method dictates. These outputs are general starting points for a coaching conversation, not medical advice, and the results page should say that plainly.
Everything below runs on the free tier at lovespreadsheets.com; a custom domain for the calculator is the upgrade if you want one.
Pick the Calculator template and type what should happen, in your own vocabulary:
"Someone enters their age, weight, height, how often they train, and whether they're cutting, maintaining, or bulking. My sheet's formulas return daily calories and a protein, carb, and fat split. Ask for an email before showing the numbers, and add the email plus all their answers as a row on my Leads tab."
Then stack the requests that turn a calculator into a coaching funnel:
The AI may come back with a clarifying question about a cell or two; total build time runs about 15–20 minutes, and you end up with a shareable URL or an HTML download to embed wherever you like.
Point your Instagram bio, your YouTube descriptions, and your DM auto-reply at the calculator. The "how many calories" crowd now gets an instant, on-method answer — and each of them lands in your Leads tab with an email, their stats, and their goal. The results email they receive doubles as the first touch of your nurture sequence, sent to an address they had every reason to enter honestly.
When one of them signs, their check-ins live in a portal from the same sheet — see our client portal guide for fitness coaches.
It's your method, published. Generic TDEE sites run one-size-fits-all equations; this runs the exact multipliers and protein targets you coach with.
The audience becomes an asset. Followers rent you attention; a Leads tab full of emails and goals is a list no algorithm change can take away.
Refining your approach is a cell edit. Decide protein should be 0.9 grams per pound instead of 1.0? Change it once and every future result reflects it.
Do I need a website first? No — the calculator gets its own hosted URL that works as a link-in-bio, and you can embed the HTML on a site whenever you build one.
Will followers hand over a real email? The results email is the delivery mechanism for their numbers, so fake addresses defeat the point — completion rates stay high because they've already typed in five answers.
Can I segment cutters from bulkers? Yes — goal arrives as its own column in the Leads tab, so your follow-up for fat-loss leads never gets sent to someone chasing a bulk.
Grab the sheet you already program clients from, visit lovespreadsheets.com, and describe the calculator your DMs keep asking for. The next "how many calories should I eat?" gets a link — and your list gets a lead who already told you their goal.
The team turning other people's spreadsheets into software they actually trust — one sheet at a time.