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Free weight loss percentage calculator: compute % of body weight lost with (lost ÷ start) × 100, rank fair office challenges, or get goal weight for 5%, 10%, or 15% targets. Default: 200 → 180 lbs = 10.00% lost.
Last updated: May 25, 2026
Need daily calories for your next milestone? Fat loss deficit calculator
Default: 200 lbs start, 180 lbs current
10.00%
Major health benefit (10–15%)
20.0 lbs lost
Current: 180.0 lbs
Reached — at or above 5% from start
(200 − 180) ÷ 200 × 100 = 10.00% · 20 lbs lost
Participant A (300 lbs)
5.0%
15 lbs lost
Participant B (160 lbs)
9.4%
15 lbs lost
5% from 220 lbs
5.0%
209 lbs goal
10% goal from 200
180 lbs
target weight
Same 15 lb loss — higher % for the lighter starter (fair challenge scoring).
weight loss % = (start − current) ÷ start × 100goal weight = start − (start × target% ÷ 100)lbs to reach 5% = max(0, current − start × 0.95)| Target % | Example start | Goal weight | Notes |
|---|---|---|---|
| 5% | 220 lbs | 209 lbs | 5% (clinical baseline) |
| 10% | 200 lbs | 180 lbs | 10% milestone |
| 15% | 180 lbs | 153 lbs | 15% transformative |
| % lost | Tier | Typical context |
|---|---|---|
| Under 5% | Early progress | CDC cites benefits ramping at 5% of starting weight |
| 5% to under 10% | Clinically meaningful | Often improves BP, blood sugar, lipids |
| 10% to under 15% | Major health benefit | Stronger metabolic improvements in studies |
| 15%+ | Transformative change | Largest shifts; maintain with medical support if needed |
(200 − 180) ÷ 200 × 100 = 10.00% · 20 lbs lost · Major health benefit (10–15%)
5.0% · 11 lbs lost
Hit 10% at 180 lbs on the scale
Goal weight 153 lbs (27 lbs to lose)
-2.78% (negative = gained 5 lbs)
Share so everyone uses the same percentage formula for fair rankings
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