What is the national standard for the height of desks and chairs?

According to national standards and industry practices, the height of desks and chairs must strictly follow the "Functional Dimensions and Technical Requirements for School Desks and Chairs" (GB/T 3976-2014). The specific specifications are as follows:

‌I. Standard height of desks and chairs for primary and secondary schools‌
‌Tabletop height classification‌

There are 11 models (0-10), corresponding to different height ranges:
• No. 0 (height ≤ 113cm): tabletop height 49cm, chair surface height 27cm.
• No. 5 (height 150-164cm): tabletop height 70cm, chair surface height 40cm.
• No. 10 (height ≥ 180cm): tabletop height 79cm, chair surface height 46cm34.
‌Core adaptation principle‌

Students must meet the following requirements when sitting down:
• Thighs and calves are vertical (no pressure on the knee pit).
• Upper arms hang naturally, with elbows 3-4cm below the tabletop.
• Feet flat on the ground, with backs against the back of the chair.