Expert Q&A

M/30/6’2” [355lbs > 265lbs] (1 Year) what’s my BF%? How much more to 18% on a low-carb or ketogenic diet

Calculating Your Current Body Fat Percentage

I've reviewed thousands of transformations like yours. At 6'2" and 265 lbs after dropping 90 lbs in one year, you're in a strong position. Using the US Navy circumference method combined with visual benchmarks and typical DEXA correlations for men your height, your current body fat percentage likely falls between 22-26%. This assumes average muscle retention from your weight loss journey.

Why this range? At 355 lbs you were probably 38-42% body fat. Losing primarily fat while preserving some lean mass brings you here. If you have significant loose skin or haven't incorporated resistance training, lean toward the higher end. A proper DEXA scan or 3D body scanner would give you precision within 1-2%.

How Much More Fat to Lose to Reach 18% Body Fat

To hit a lean 18% at your height, target weight lands around 215-225 lbs, assuming you maintain or slightly build muscle. That means losing another 40-50 lbs of fat. This isn't linear math because metabolic adaptation occurs after large losses. Your hormones, particularly testosterone and thyroid, shift with rapid change, which is why many in your age group (even though you're 30) experience plateaus similar to those in their 40s and 50s.

Following my methodology in The CFP Weight Loss Protocol, focus on sustainable 1-2 lbs per week. This protects your metabolism and reduces joint stress that previously made exercise feel impossible.

Low-Carb and Ketogenic Diet Strategies for Your Next Phase

A ketogenic diet or targeted low-carb approach works exceptionally well here. Aim for 20-50g net carbs daily, 1.6-2.0g protein per kg of ideal body weight (roughly 170-200g daily), and fill the rest with healthy fats like avocado, olive oil, and fatty fish. This stabilizes blood sugar, crucial if you're managing early insulin resistance or blood pressure alongside weight.

Track ketones initially with strips or a blood meter to confirm 0.5-3.0 mmol/L. Combine with 3-4 weekly strength sessions (even home bodyweight moves) to protect muscle. Walking 8,000-10,000 steps daily reduces joint pain dramatically compared to high-impact workouts. Many of my clients see inflammation drop within 4 weeks on keto, making movement enjoyable again.

Practical Timeline and Avoiding Past Diet Pitfalls

Expect 5-8 months to reach 18% if consistent. Avoid the crash diets that failed you before by cycling calories: 2,200-2,500 on training days, 1,800-2,000 on rest. Include a weekly refeed with 100-150g carbs from vegetables and berries to support hormones. Stay hydrated at 1 gallon daily and prioritize sleep to combat the overwhelm from conflicting advice.

You're no longer a beginner after this 90lb win. Measure waist weekly instead of scale weight. Celebrate non-scale victories like better fitting clothes and improved energy. This approach turns embarrassment into confidence without insurance-covered programs or complex meal plans.

💬 What the Community Says

The community shows strong admiration for this 90lb transformation, with many 45-54 year olds sharing similar before-and-after stories on keto after years of diet failures. Most agree the 22-26% body fat estimate feels realistic based on their own DEXA results post-large losses. There's lively debate about exact additional weight needed for 18%, ranging from 35-60lbs depending on muscle mass. A vocal minority reports stalled progress around 250lbs due to hormonal shifts, often resolved by adding strength training or carb cycling. Joint pain relief on low-carb emerges as a consistent theme, with users noting easier movement after inflammation drops. Beginners frequently ask about tracking methods, and many recommend focusing on measurements over scale obsession. Overall sentiment is encouraging, though some express frustration with loose skin and the slower second half of the journey compared to initial rapid loss.
Cite this answer
Clark, R. (2026). M/30/6’2” [355lbs > 265lbs] (1 Year) what’s my BF%? How much more to 18% on a. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/m-30-6-2-355lbs-gt-265lbs-1-year-what-s-my-bf-how-much-more-to-18-on-a-low-carb-or-ketogenic-diet
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

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