Chinese jeans listings often use waist centimeters, body-code labels or flat garment measurements. Waist centimeters are the safest starting point.
Quick answer: A Chinese jeans waist of 76 cm is about US 30, 80 cm is about US 32 and 84 cm is about US 33-34.
If a chart lists 80 cm waist and 104 cm hip, start around US W32 and compare hip and thigh too.
If the chart says flat waist, double the number only when the seller clearly means a flat garment measurement.
Jeans fit depends on waist, hip, thigh, rise and stretch.
Do not use letter size alone for fitted pants.
This page answers one specific search intent. For a full table, reverse conversion, nearby sizes or live currency and calendar inputs, use the linked main converter.
When a Chinese listing includes both a label and a metric value, use the metric value first. Labels are useful shortcuts, but centimeters, kilograms and square meters are easier to verify.