How Much Weight Can I Lose in 6 Months?
At safe paces a realistic half-year is about 26–52 lb (12–24 kg). Enter your numbers to project your own 6-month figure and goal date.
Calculate Your Plan
Range: 30–300 kg · up to 2 decimals
Range: 30–300 kg · up to 2 decimals
Enter your height in centimeters (e.g., 170 cm)
Range: 18–100 years
Required: the BMR formula uses biological sex (male or female) as a variable, so the estimate can’t be calculated without it.
*This calculator is for informational purposes only. Please consult a healthcare professional before making any health decisions. See our medical disclaimer for more information.
Date-Based Planning
Have a wedding, vacation, or competition coming up? Select “By Duration” to enter a number of days, weeks, or months and let the algorithm reverse-engineer your required daily deficit.
The 7,700 kcal/kg Rule
A kilogram of body fat contains approximately 7,700 calories. To lose 0.5 kg per week, you need a daily deficit of 550 calories (550 × 7 = 3,850).
| Pace | Deficit/Day |
|---|---|
| 0.25 kg / wk | 275 kcal |
| 0.50 kg / wk | 550 kcal |
| 0.75 kg / wk | 825 kcal |
| 1.00 kg / wk | 1,100 kcal |
Safe Loss Rates
Aggressive deficits lead to muscle wasting. A safe clinical guideline is to aim for losing 0.5% to 1.0% of your total body weight per week.
- 70 kg person:0.35 – 0.70 kg/wk
- 90 kg person:0.45 – 0.90 kg/wk
- 110 kg person:0.55 – 1.0 kg/wk *
* 1% of body weight would be 1.10 kg/wk. This tool caps the selectable rate at 1.0 kg/wk — a pace suited mainly to higher body weights. At most body weights a 1.0 kg/wk rate implies an ~1,100 kcal/day deficit, above the 1,000 kcal/day guideline, which is why it is flagged "Very Aggressive".
Reverse Dieting
When you hit your goal weight, gradually add 100–200 calories back per week until your weight stabilises. Your metabolism has adapted — jumping straight to maintenance calories causes rebound fat gain.
Quick Answer
How Much Weight Can I Lose in 6 Months?
Six months is about 26 weeks, so at a safe 1–2 lb (0.5–1 kg) per week the realistic range is roughly 26–52 lb (12–24 kg). The top of that band suits larger starting weights and rarely holds the whole way; steadier paces land nearer the bottom. Enter your current weight, goal weight and activity level and the planner — preset to a six-month deadline — reverses that timeline into the daily target it needs.
How It's Derived
The whole range is a single multiplication. Six months is close to 26 weeks, so you take your weekly pace and multiply by 26. A gentle 1 lb a week comes to about 26 lb over the half-year, a middle 1.5 lb a week to about 39 lb, and the fastest safe rate of 2 lb a week to about 52 lb. That is why the honest headline band is 26–52 lb (12–24 kg): it is just the safe 0.5–2 lb per week window stretched across the same 26 weeks. The tool works this the other way round — you hand it a six-month deadline and a goal, and it reverses the timeline into the required daily deficit rather than making you guess the pace. To see how that daily number is assembled from food, the Calorie Deficit Calculator breaks it down.
Why the Top End Rarely Holds
The 52 lb figure at the top of the range is best read as a ceiling rather than a forecast. As you get lighter your maintenance calories fall, so a fixed intake produces a steadily shrinking deficit, and the back half of a six-month run is almost always slower than the front. The planner estimates maintenance once, from your starting numbers, and holds that static figure for the whole projection — it cannot model the adaptation that happens as the pounds come off, so it will tend to show the optimistic end. The practical fix is simple arithmetic upkeep: recalculate every 5–10 lb so the daily target keeps pace with your lighter body, and treat the upper bound as the most it could be, not the amount to expect.
A Half-Year Suits Larger Goals
Put as plain arithmetic, six months comfortably covers a 30–50 lb target at a sustainable 1–2 lb a week, which is why a half-year is the timeframe people reach for when the goal is sizeable rather than a quick few pounds. Tracking the loss as a percentage of your starting weight keeps the milestones legible — a 5% and 10% mark says more about progress than a raw pound count, and the Weight Loss Percentage Calculator works those figures out for you. Once you know the amount and the pace, set the exact date with the parent Goal Weight Calculator, preset here to six months. These figures are general estimates for healthy adults, not medical advice.
Projections use maintenance estimated by the Mifflin-St Jeor equation (1990) and the energy model of body fat (Hall et al., 2011). A safe pace is 0.5–2 lb (0.25–1 kg) per week with a daily deficit up to about 1,000 kcal (NHS). Maintenance falls as you lose weight; individual results vary.
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Explore More Tools
Each calculator feeds into the next — your data carries forward automatically through every step.
Goal Weight
Find out exactly when you will reach your goal — or what deficit it takes to hit a specific deadline.
Calorie Deficit
Calculate the precise daily deficit needed to reach your goal without sacrificing lean muscle mass.
Weight Loss %
Track milestones as a percentage — with clinical thresholds (5%, 10%) that map to real health outcomes.