About Sixpacks.fit
Sixpacks.fit is a free collection of fitness calculators and guides focused on one specific goal: understanding what it actually takes to make abdominal muscles visible. Every tool runs in your browser, needs no sign-up, and costs nothing.
Who runs this site
Sixpacks.fit is a one-person website. It was founded and is published by Shakeel Ahmed, who builds the tools, writes the guides, and maintains everything you see here. There is no team, no staff, and no medical review board behind this site — and you will not read otherwise on these pages. If something is wrong, the same person who wrote it fixes it.
What you will find here
The site currently offers 12 free tools:
- Number calculators: body fat (U.S. Navy method), TDEE (Mifflin-St Jeor), calorie deficit, macros, protein, BMI, ideal weight, and water intake.
- Planning tools: the six-pack timeline calculator, the Summer Preparation Planner, the abs workout generator, and the HIIT ab timer.
Alongside the tools are plain-English guides on training, nutrition, and body composition, written to explain the numbers the calculators produce — not to sell anything.
How the content is made
Every calculator is built on a published, established formula — for example, the U.S. Navy circumference method for body fat and the Mifflin-St Jeor equation for daily energy expenditure. Each tool page explains which formula it uses, how the math works, and where its limits are.
Guides are researched before they are written, and every article ends with a Sources section listing the references it relies on. Every page is reviewed by the site operator before publication. The review is one person rereading their own work — that is the honest description, and the Editorial Policy describes it in full.
What this site is not
Sixpacks.fit is not a medical service. Nothing here diagnoses, treats, or replaces professional advice, and the author is not a doctor, dietitian, or personal trainer. All results from the tools are estimates, not clinical measurements. If you have a medical condition, an injury, a history of disordered eating, or are pregnant, please talk to a qualified healthcare professional before acting on anything published here.
Why free, and why no accounts
The calculators run entirely in your browser: the numbers you enter never leave your device and are never stored or sent to a server by the tools themselves. The site is supported by advertising when ads appear, and it will never ask you to create an account to see a result.
Questions or corrections?
Found a bug, a broken link, or a number that looks wrong? Email team.sixpacks.fit@gmail.com or use the contact page. Confirmed errors are corrected, and pages that changed carry an update note.
Last updated: November 2, 2026