For Southeast Asian mango exporters selling on Alibaba.com, understanding size grading standards is fundamental to B2B success. Unlike manufactured products where "custom size" means bespoke dimensions, fresh mango sizing follows established weight-based classification systems recognized globally.
The USDA grading standards define three quality levels (U.S. Fancy, U.S. No. 1, U.S. No. 2) with 10% tolerance for size variations [1]. Meanwhile, the FAO CODEX international standard specifies three size groups: Class A (200-350g), Class B (351-550g), and Class C (551-800g), with maximum weight difference of 75-125g per package [3].
Mango.org's comprehensive review expands this to five categories: Small (<200g), Medium (201-400g), Large (401-600g), Extra-large (601-800g), and Maximum Large (>800g) [2]. This granular classification allows exporters to target specific buyer segments with precision.
International Mango Size Grading Standards Comparison [1][2][3]
| Standard | Size Categories | Weight Range | Tolerance | Primary Market |
|---|---|---|---|---|
| USDA | 3 grades (Fancy/No.1/No.2) | Variable by grade | 10% | United States |
| FAO CODEX | 3 classes (A/B/C) | A: 200-350g, B: 351-550g, C: 551-800g | 10% | International trade |
| Mango.org | 5 categories | Small <200g to Max Large >800g | Weight-based | Global retailers |
| Thailand Export | 4-5 count sizes | Nam Dok Mai variety specific | 5-8% | Japan, Korea, China |
| Vietnam Standard | 3-4 grades | Cat Chu 250-400g typical | 10% | China, South Korea |
What does "standard size" mean in practice? For Southeast Asian varieties like Thailand's Nam Dok Mai, Vietnam's Cát Chu, or Philippines' Carabao, standard sizing typically means:
- Count per carton: 12-count, 16-count, or 20-count per 3kg export carton
- Weight consistency: Maximum 50g variance within same carton
- Visual uniformity: Similar color, shape, and maturity stage
Custom size configurations involve deviations from these norms: specific weight ranges requested by buyers (e.g., "250-280g only"), unique count configurations (e.g., "8-count premium gift box"), or variety-specific sizing not covered by standard grades.

