Convert among gross floor area, inner area and shared (common) area by factor; check the usable-rate.
按套内面积与公摊系数互算建筑面积与得房率,用于购房面积核对。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Shared-area factor | Factor = shared area ÷ Σ in-unit built area | GB/T 17986.1-2000 Real Estate Surveying |
| In-unit built area | Usable + in-unit walls + balconies (inside full, outside half) | GB/T 50353-2013 Building-area rules |
| Sale-area relation | Sale area = in-unit built × (1 + factor) | Commodity-housing sale practice |
| Efficiency reference | Towers 72%–80%, slab blocks 80%–88% usable ratio | Product-type market statistics |
建筑面积/套内/公摊换算。免费在线工具,纯前端处理,数据不上传,保护隐私安全。