For a Queen Size mattress this corresponds to 5 'or 6' ?

Five foot.

Single: 6 ft 6 inches (198 cm) long x 3 ft (91 cm) wide

Large Single: 6 ft 6 inches (198 cm) long x 3 ft 6 inches (107 cm) wide

Queen: 6 ft 6 inches (198 cm) long x 5 ft (152 cm) wide

King: 6 ft 6 inches (198 cm) long x 6 ft (183 cm) wide

Bed Name Width Length
US Single 39-inches 0.99m 75-inches 1.91m
Thai 3.5 –ft 42-inches 1.07m 78-inches 1.98m
US Double 54-inches 1.37m 75-inches 1.91m

Thai 5-ft 60-inches 1.52m 78-inches 1.98m
US Queen 60-inches 1.52m 80-inches 2.03m

Thai 6-ft 72-inches 1.82m 78-inches 1.98m
US King 76-inches 1.93m 80-inches 2.03m

23 hours ago, mudcat said:

Bed Name Width Length
US Single 39-inches 0.99m 75-inches 1.91m
Thai 3.5 –ft 42-inches 1.07m 78-inches 1.98m
US Double 54-inches 1.37m 75-inches 1.91m

Thai 5-ft 60-inches 1.52m 78-inches 1.98m
US Queen 60-inches 1.52m 80-inches 2.03m

Thai 6-ft 72-inches 1.82m 78-inches 1.98m
US King 76-inches 1.93m 80-inches 2.03m

Does Thailand not metric measurements also for mattresses?