TDEEMacroCalculator.com is a production-grade nutrition and fitness calculator web app: a free, no-signup suite of TDEE, calorie, and macro tools wrapped in a substantial library of original educational content. It is built for organic search traffic in the high-intent diet/fitness niche and ships with monetization infrastructure already wired in. It is positioned as a bonus property bundled with Meketo.com (the premium domain and primary product in the package).

The site requires no account, no database, and no live backend. Every calculation runs in the visitor’s browser, and the entire site is statically generated and served from a CDN, which keeps hosting costs near zero and uptime effectively maintenance-free.

Technology Stack

Framework: Next.js 16.2.4 (App Router) with Turbopack

UI: React 19.2.4, with the React Compiler enabled (babel-plugin-react-compiler) for optimized rendering

Language: TypeScript 5 (fully typed codebase)

Styling: Tailwind CSS v4 with a CSS custom-property design-token system driving a full dark and light theme

Runtime target: Node.js 24.x

Hosting: Vercel (Git-based continuous deployment)

Analytics: Vercel Analytics + Vercel Speed Insights (both cookieless), plus consent-aware Google Analytics 4

Email: Resend (contact form delivery)

Quality tooling: ESLint 9, Lighthouse CI (@lhci/cli), axe-core accessibility CLI, and two custom verification scripts (calculation accuracy + functional readiness)

The build produces roughly 120 prerendered routes (about 115 static HTML pages plus sitemap, icons, and feeds). There is no timed revalidation and no per-request server rendering of content pages; the deploy itself is the only refresh trigger, so there are zero recurring ISR/database costs.

The Core Calculator (homepage engine)

The flagship TDEE & Macro Calculator is a single, reusable engine that powers the homepage and is re-skinned as preset variants across the site. Capabilities:

Three BMR formulas: Mifflin-St Jeor (default/recommended), Harris-Benedict (revised), and Katch-McArdle (lean-body-mass based, uses body-fat input)

Six activity levels with standard multipliers (1.2 sedentary → 2.0 professional athlete)

Seven goals from aggressive cut (−1000 kcal) through maintenance to aggressive bulk (+750 kcal)

Nine diet templates with distinct macro ratios per goal phase: Standard, Keto, Low Carb, Carnivore, Mediterranean, High Protein, Vegan, Vegetarian, and IIFYM

Outputs: BMR, TDEE (maintenance), goal calories, macro grams and percentages (protein/carbs/fat), BMI with category, projected weekly weight change, and lean/fat mass when body fat is supplied

UX: imperial and metric units with live conversion, instant auto-calculation as you type, shareable URL state (inputs encoded in the link), unit preference saved to local storage, and a results card with copy/share

All math lives in a single typed library and is covered by a verification script (17 calculation tests passing).

Full Calculator & Tool Lineup

Beyond the homepage, the site ships roughly 20 dedicated calculator pages, many of which are intent-targeted presets of the core engine, plus several standalone calculators with their own math:

Goal and body-composition calculators: Macro Calculator, Calorie Deficit Calculator, Cutting Calculator, Bulking Calculator, Lean Bulk Calculator, Body Recomposition Calculator, Reverse Diet Calculator, Protein Calculator, High Protein Diet Calculator, Intermittent Fasting Calculator.

Diet-specific calculators: Keto Macro Calculator, Vegan Macro Calculator, Carnivore Diet Calculator, Mediterranean Diet Calories, IIFYM Calculator.

Standalone-math calculators: BMI Calculator, BMR Calculator, Body Fat Calculator (BMI-based estimate), Ideal Weight Calculator (Devine, Robinson, Miller, and Hamwi formulas with averaged range), Calorie Burn Calculator (MET-based, with a library of ~45 activities from walking to CrossFit).

Intent landing pages: Calories to Lose Weight, Calories for Maintenance, How Many Calories Should I Eat, Macros for Weight Loss, Macros for Muscle Gain.

Programmatic SEO Pages

Two generated route families produce long-tail search landing pages at build time, each fully static:

/calories-for/[profile] – 60 pages: every combination of sex (man/woman) × age band (teens, 20s, 30s, 40s, 50s, 60s) × activity level (sedentary, lightly active, moderately active, very active, extremely active), each with a tailored calorie estimate and copy.

/tdee-for/[activity-level] – 5 pages: one per activity level.

These are real, indexable, content-bearing pages (not thin doorways), built to capture specific long-tail queries like “calories for a woman in her 30s who is moderately active.”

Editorial Content Library

The site is a genuine content property, not just a tool. It includes ten original long-form educational articles written to E-E-A-T standards:

TDEE vs BMR, Mifflin vs Harris-Benedict, Protein Timing and Distribution, The Truth About Metabolic Adaptation, Sleep and Body Composition, Hidden Calories and Tracking Mistakes, Protein Quality and Amino Acids, Calorie Cycling and Refeed Days, Water Intake and Weight Loss, and Reverse Dieting Explained.

It also carries the trust and compliance pages that ad networks and search engines expect: About, Methodology, Editorial Policy, Medical Review Process, Privacy Policy, Terms of Use, an HTML sitemap, and a contact form. Content uses an “Editorial Team” organizational identity (no personal founder tie-in), with a citation/references system built in.

SEO & Distribution Infrastructure

Structured data (JSON-LD): WebApplication, FAQPage, Organization, WebSite, BreadcrumbList, and per-page WebPage schema

Dynamic Open Graph images: generated on demand via an /api/og route

Sitemap + IndexNow: an auto-generated sitemap plus a GitHub Actions workflow that submits to Bing/IndexNow on every successful production deploy

Embeddable widget: an /embed route renders the calculator as an iframe widget that other sites can place on their own domains, with a matching /embed-code page, a built-in backlink/distribution channel

Metadata helpers: canonical URLs, Open Graph, and Twitter cards across all pages

Performance & Quality

On Google PageSpeed Insights, the shipped build measures 99 mobile / 100 desktop for Performance, with 100 across Accessibility, Best Practices, and SEO. Cumulative Layout Shift is 0. Performance is enforced in CI via Lighthouse CI. The codebase follows a strict Content Security Policy and passes automated accessibility checks.

Privacy, Consent, & Compliance

Privacy-first by design: calculator inputs never leave the browser; no accounts, no payment data, no health records stored; no PII in analytics

Google Consent Mode v2 with a region-aware consent banner shown only to EEA, UK, and Switzerland visitors (everyone else granted by default); choices stored locally

Rate limiting on the contact form and OG endpoint using SHA-256-hashed IPs with a server-side salt (raw IPs never written to disk or logs)

Analytics are loaded only on genuine user engagement to protect performance

Monetization Infrastructure

Google AdSense is fully plumbed in (ad-slot components, CSP allowances, consent integration) but disabled by default. A buyer activates ads by supplying their own AdSense publisher ID (NEXT_PUBLIC_ADSENSE_CLIENT_ID) and flipping NEXT_PUBLIC_ADSENSE_ENABLED=true, with no code changes required. The site is also well-suited to display-ad networks, affiliate placements, or lead-gen, given its high-intent fitness/nutrition traffic.

What Transfers & Operating Profile

Operating cost and effort: minimal. Static CDN hosting, no database, no servers to maintain, no recurring content-refresh writes. Updates ship by editing content and deploying.

Complete source repository (clean, documented, with a buyer handoff guide and environment template)

The domain and the live Vercel deployment

Environment variables a buyer swaps to their own accounts at transfer: GA4, Search Console/Bing, Resend, and AdSense