How Many Calories A Day To Maintain 600 Pounds? | Real-World Math

“How many calories keep 600 pounds steady?” is a tough ask because bodies differ.
Energy needs scale with body size, but height, age, sex, muscle, meds, sleep, and daily steps all move the target.
You can still land on a workable range today and refine from there. This guide lays out the math, shows clear examples, and gives a simple way to test your number.

Calories To Maintain 600 Lbs Per Day: Realistic Range

If you only need a ballpark, use this sweep:

• Sedentary: around 3,800–4,600 kcal/day
• Lightly active: around 4,200–5,200 kcal/day
• Moderately active: around 4,800–5,800 kcal/day

Those bands assume mid-range height and adult ages. Taller or younger adults skew higher.
Shorter or older adults skew lower. Daily steps matter a lot.

Quick Activity Map For A 600-Lb Adult

Activity Level	What A Day Looks Like	Estimated Maintenance (kcal/day)
Sedentary	Desk work, short errands, <5k steps	3,800–4,600
Lightly Active	House chores, frequent breaks, 5–8k steps	4,200–5,200
Moderately Active	On feet much of the day, 8–12k steps	4,800–5,800
Active+	Manual work or long walks, >12k steps	5,300–6,300

Use this only as a start point. A short trial will tell you if you sit above or below these bands.

The Math Behind The Range

Most coaches start with a resting estimate (BMR) and then apply an activity factor.
A common method is Mifflin-St Jeor:

BMR = 10×weight(kg) + 6.25×height(cm) − 5×age(y) + s   where s = +5 (male) or −161 (female)

For 600 lb (272 kg) at 5′8″ (173 cm) and age 35:

• Male BMR: 2720 + 1081 − 175 + 5 = 3,631 kcal/day
• Female BMR: 2720 + 1081 − 175 − 161 = 3,465 kcal/day

Now multiply by a day-to-day factor:

• 1.2 (sedentary)
• 1.35 (light)
• 1.5 (moderate)
• 1.7 (active+)

That yields maintenance near 4,400–6,200 kcal/day for this height and age, which matches the earlier sweep.

Want a tool that models intake changes over weeks? Try the NIH Body Weight Planner.
For diet pattern ideas across calorie levels, see the Dietary Guidelines.

What Pushes Maintenance Up Or Down

Height And Frame

Taller bodies have more tissue. That lifts BMR and raises the final number. Shorter frames sit lower.

Age

Energy burn tends to drift down with age. The formula already subtracts for age, and many people move less as years pass.

Sex And Hormones

On average, men carry more lean mass at a given weight, which bumps daily burn. Hormone therapy or thyroid issues can nudge needs either way, so tailor with real-world tracking.

Muscle And Water

Two people at 600 lb can have different lean mass. More muscle burns more even at rest. Shifts in fluid also swing scale weight day to day, so judge trend lines, not a single spike.

Daily Movement

Step count, standing time, chores, and job demands add a large chunk. A 2k-step swing can mean hundreds of calories.

Medications And Sleep

Some meds raise appetite or slow burn. Short sleep pushes snacking and makes movement feel harder. Small fixes here often change intake needs.

Worked Examples With Realistic Assumptions

Case A: 5′8″ Male, Age 35

BMR ≈ 3,631. At 1.2–1.5 activity, maintenance lands near 4,400–5,450.

Case B: 5′4″ Female, Age 45

Weight 600 lb (272 kg), height 163 cm, age 45. BMR = 2720 + 1019 − 225 − 161 = 3,353. At 1.2–1.5, maintenance sits near 4,020–5,030.

Case C: 6′2″ Male, Age 30

Height 188 cm, age 30. BMR = 2720 + 1175 − 150 + 5 = 3,750. At 1.2–1.5, maintenance sits near 4,500–5,625.

These are not caps or floors. They are anchors for testing.

Find Your Personal Number In Two Weeks

The Intake-Weight Check

1. Pick a start target from the range above.
2. Log meals and drinks for 14 days. A simple app or a note works fine.
3. Weigh at the same time daily, then use a 7-day rolling average.
4. If the trend drifts up, trim 100–300 kcal/day. If it drifts down, add 100–300. Hold each change for 5–7 days before the next tweak.

Why Small Tweaks Work

Small changes show the direction fast while keeping hunger, mood, and routines stable. Big swings blur the signal and are hard to sustain.

Helpful Tracking Tips

• Use a food scale for dense items like oils, nuts, and cheese.
• Batch-cook and portion once to cut guesswork later.
• Walk count matters. Log steps so intake matches movement.

Pick An Activity Factor That Fits

Activity multipliers cause most of the spread. A fast way to pick one is to match steps and job demands:

• 1.2 if most hours are seated and steps sit under 5k.
• 1.35 if you rack up 5–8k steps with light chores or short bouts of walking.
• 1.5 if you often pass 8–12k steps or stand for long stretches.
• 1.7 if you handle manual work or rack up long walks most days.

Not sure where you land? Start with 1.35, log two weeks, then nudge up or down. Step count is the best guide here.

No Height Or Age Handy? Use A Per-Pound Rule

When you lack height or age, a rough intake that holds weight for many large adults falls in the 7–10 kcal per pound band.
At 600 lb, that spans 4,200–6,000 kcal/day. Pick the lower end if steps are low and sleep is thin; pick the upper end if steps are high or you are tall.
Fine-tune with the two-week check.

Build A Daily Calorie Budget You Can Live With

A steady routine beats perfection. Split your target across meals that fit your schedule:

• Three meals: 35% breakfast, 30% lunch, 35% dinner. On 4,800 kcal that’s 1,680 / 1,440 / 1,680.
• Three meals + snack: 30% / 25% / 35% + 10% snack. On 5,400 kcal that’s 1,620 / 1,350 / 1,890 + 540.
• Two meals + two snacks: 30% / 30% meals + two 20% snacks. On 4,200 kcal that’s 1,260 / 1,260 + two 840 snacks.

Big social dinners? Shift more calories to the evening on those days and trim breakfast. The weekly average is what counts. Keep portions measured when possible.

Weekends, Travel, And Big Days

Life swings. A few easy rules keep the scale steady even when days get messy:

• Hold protein and produce steady across the week. Flex carbs and fats to match events.
• Pre-log one anchor meal before you head out. Leave a buffer of 500–800 kcal if plans are loose.
• Travel day plan: protein snack in your bag, water, and a simple breakfast before the trip.
• Walking tourist days burn more; raise carbs and salt a touch to keep energy up.

Macro Targets That Fit A 600-Lb Maintenance

Protein steadies appetite and helps muscle. A simple range is 1.2–1.6 g per kg of goal body weight.
Carbs fuel steps and daily tasks. Fats carry flavor and fat-soluble vitamins.
Pick a calorie target, set protein first, then divide the rest between carbs and fats based on taste and satiety.

Sample Calorie Targets And Macro Splits

Target (kcal)	One Way To Split	Notes
4,200	Protein 180 g, Fat 130 g, Carbs 460 g	Higher carbs if step count is strong
4,800	Protein 200 g, Fat 150 g, Carbs 520 g	Balanced feel for many
5,400	Protein 220 g, Fat 165 g, Carbs 575 g	Raise protein on heavy days

What A Maintenance Day Can Look Like

Simple Meal Pattern

Pick three to four eating windows. Anchor each with a protein source, a fiber-rich carb, produce, and a tasty fat. Here is a sample for a 4,800 kcal target:

• Breakfast: Eggs, oats with berries, yogurt, olive oil drizzle
• Lunch: Grilled chicken, rice, beans, salad, avocado
• Snack: Cottage cheese, fruit, mixed nuts
• Dinner: Salmon or tofu, potatoes, veggies, butter or tahini

Salt to taste. Add sauces you enjoy. Drink water through the day.

Practical Notes For Comfort And Safety

• Plan sturdy seating and wide-grip tools in the kitchen to make prep easier.
• Choose low-impact movement you enjoy: short walks, pool time, or pedal devices while seated.
• Keep a simple blood work schedule with your clinician if you take meds that affect appetite or fluids.
• Stay hydrated through busy days and heat.

Troubleshooting Stalls

Weight Stuck But Waist Shrinking

That can point to water shifts or muscle gain. Keep intake steady for another week and track waist and photos.

Hunger Through The Roof

Push protein and fiber higher, spread meals across the day, add low-cal broths or salads, and raise sleep time.

Energy Slumps Midday

Shift more carbs to meals before long walks or busy periods. Keep a steady salt intake, especially in hot weather.

Your Maintenance, Your Rules

Use the range to start, test with a short log, and nudge intake until weight trends level.
Once the number holds for two weeks, you have your personal maintenance.
From there, you can keep weight stable, or make small changes on purpose when life calls for it today.