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Weight-Loss Percentage Calculator
Track weight-loss as a % of your starting weight, with a weekly-rate traffic light (safe ≈ 0.5–1%/week) and the clinical 5%/10% milestones — ≥5% loss is associated with HbA1c ↓0.6–1.0% (ADA / ACC-AHA-TOS). Associations, not guarantees; not medical advice. Accurate, instant and free — for United States.
What these mean:
What these mean:
What these mean:
7.5% lost vs your starting weight (15 lb). Past the 5% clinically-significant mark; 5 lb to the 10% milestone. The 5%/10% health benefits are associations, not guarantees — general information, not medical advice.
Rates as of 2026% lost
7.5% lost
Weight lost (lb)
15 lb
5% milestone
✓ achieved5% of your starting weight is 10 lb lost.
Clinically meaningful - >=5% loss is associated with lower HbA1c (~0.6-1.0%), better blood pressure and lipids.
10% milestone
5 lb to go10% of your starting weight is 20 lb lost.
~10% loss is associated with larger cardiometabolic improvements and lower type-2-diabetes risk.
Why 5% matters — the diabetes link
Associations, not guarantees — not medical advice
How we calculate this
Reviewed by Reckonist Editorial · Last reviewed July 2026. Figures follow the methods and sources set out in our editorial standards.
Milestone health benefits per ADA Standards of Care / ACC-AHA-TOS obesity guideline (2026) — associations, not guarantees. General information, not medical advice.
ADA Standards of Care · ACC-AHA-TOS obesity guideline · Nature / Int J Obesity 2024 · CDC · milestones as of 2026
See what ≥ 5% loss means for your glucose with the A1C Calculator, and set your diet with the Macro Calculator.
Percentage of your STARTING weight — not your current weight
Your weight-loss percentage is the weight you have lost divided by your starting weight — (start − current) ÷ start × 100. Measuring against the start (not your current weight) is what makes the clinical 5% and 10% milestones meaningful. Every value carries its unit — percent, and pounds or kilograms lost. The percentage itself is unit-free, so kg and lb give the same answer.
Total percentage
(start − current) ÷ start × 100
% lost = (start − current) ÷ start × 100
A current weight above your start shows an honest negative (weight gained), not a hidden zero.
Weekly rate
% ÷ weeks; safe ≈ 0.5–1%/wk
weekly rate = total % ÷ weeks
Graded green inside ≈ 0.5–1% of body weight per week, amber above it.
- 1Percentage: 200 − 185 = 15 lb lost; 15 ÷ 200 × 100 = 7.5%.
- 2Milestones: 5% of 200 = 10 lb (already past); 10% of 200 = 20 lb, so 5 lb to go.
Weekly rate and the safe 0.5–1%/week range
Enter how many weeks your loss took and the tool divides your total percentage by the weeks to get a weekly rate, then grades it against the commonly cited safe band of roughly 0.5–1% of body weight per week — green inside the range, amber above it. Faster is not better: very rapid loss tends to include more muscle and water, and it is harder to keep off. This is general information, not medical advice.
Projecting to a goal — and why plateaus are normal
Add a goal weight and the tool shows how much more you have to lose from your current weight to reach it. Any timeline you extrapolate from your current pace is a rough guide, not a promise: weight loss is rarely linear, and plateaus — where the scale stalls for a week or three while your body adjusts — are completely normal. The milestone weights (5% and 10% of your start) are fixed; how fast you reach them varies.
The clinical 5% and 10% milestones
What turns a vanity percentage into a health-meaningful one is the clinically-significant milestones. These are tied to the ADA Standards of Care and the ACC-AHA-TOS obesity guideline:
| Milestone | Associated benefit |
|---|---|
| ≥ 5% | Clinically meaningful — lower HbA1c (≈ 0.6–1.0%), better blood pressure and lipids |
| ≈ 10% | Larger cardiometabolic improvements and lower type-2-diabetes risk |
The diabetes cross-link
Associations, not guarantees
The 5% and 10% health benefits are associations reported across populations in the guideline evidence — not guarantees for any single person. Individual results depend on genetics, medications, starting health and how the loss is achieved and maintained. Treat the milestones as motivating, evidence-based targets, and use the tool for tracking — not as a substitute for advice from your clinician.
Not medical advice
Frequently asked questions
Divide the weight you have lost by your STARTING weight, then multiply by 100: percentage = (start − current) ÷ start × 100. For example, if you started at 200 lb and now weigh 185 lb, you have lost 15 lb, and 15 ÷ 200 × 100 = 7.5%. Always measure against your starting weight, not your current weight — that is what the clinical 5% and 10% milestones are based on.
A loss of about 5% of your body weight is the point most guidelines call "clinically meaningful". At that level, studies associate the loss with a lower HbA1c (roughly 0.6–1.0%), better blood pressure, and improved cholesterol and triglycerides. These are associations reported across populations, not guarantees for any one person — but 5% is a genuinely useful health target, not just a vanity number.
Yes. Around 10% loss is associated with larger cardiometabolic improvements and a lower risk of type-2 diabetes than 5%. For someone who started at 200 lb, 10% is 20 lb. The benefits tend to scale with the amount lost and, importantly, with keeping it off — maintained loss is what the guideline benefits are tied to.
A commonly cited safe range is about 0.5–1% of your body weight per week. This calculator grades your weekly rate with a traffic light: green inside that range, amber above roughly 1%/week. Faster is not better — very rapid loss can be muscle and water rather than fat, and it is harder to sustain. This is general information, not medical advice.
A negative percentage means your current weight is higher than your starting weight — in other words you have gained, not lost. The tool shows this honestly as, for example, "+2.8% gained" rather than hiding it. Day-to-day weight also swings with water, food and hormones, so a single higher reading is not necessarily fat gain.
Turn on the goal projection and weekly-rate options and the tool estimates the weight still to lose to your next milestone at your current pace. Treat any timeline as a rough guide, not a promise: weight loss is rarely linear and plateaus are completely normal. The milestone weights are fixed (5% and 10% of your starting weight); how fast you get there varies.
Method, milestones & references
Methodology: weight-loss percentage = (start − current) ÷ start × 100, measured against the STARTING weight; weekly rate = total % ÷ weeks, graded against a safe ≈ 0.5–1% of body weight per week band. The 5% and 10% milestones are computed as a percentage of the starting weight; their associated health benefits (≥5% → lower HbA1c ≈ 0.6–1.0%, better BP and lipids; ≈10% → larger cardiometabolic benefit and lower type-2-diabetes risk) are tied to the ADA Standards of Care and ACC-AHA-TOS obesity guideline, with Nature/IJO 2024 and CDC for general context. These are associations, not guarantees. Weight gain is shown as an honest negative percentage. Units kg/lb only label the weight figures — the percentage is unit-free. All calculations run client-side and nothing is stored. A tracking tool — general information, not medical advice.
Cross-links
How we calculate this
Reviewed by Reckonist Editorial · Last reviewed July 2026. Figures follow the methods and sources set out in our editorial standards.
The weight-loss percentage is measured against your starting weight, and the 5%/10% milestone health benefits (ADA Standards of Care / ACC-AHA-TOS obesity guideline) are associations, not guarantees. A safe rate is about 0.5–1% of body weight per week. General information, not medical advice.
Keep going
Same-category tools follow this colour; a cross-category link keeps its own.