Shiki Futon Sizing Guide

Available in three Japanese standard sizes—Single, Semi-Double, and Double—as well as a U.S. Queen Size, offered by customer request.

In Japan, futon sizes are traditionally indicated by the measurements of the outer fabric casing before stuffing. Accordingly, the sizes listed in our online store refer to the dimensions of the outer casing prior to filling (with the exception of our U.S. Queen Size Shiki Futon).

Additionally, the length of a shiki futon is generally recommended to be approximately 35–40 cm longer than the user’s height.

We list the size of our Shiki Futons based on the outer fabric casing because once it is filled with 100% pure cotton, the futon gains volume and thickness. As a result, the finished futon becomes slightly smaller than the original casing, making it difficult to state an exact final size.

On average, the width decreases by approximately 7 cm, and the length by 10 cm after stuffing. The thickness (height) of our Shiki Futon Mattress is approximately 10 cm (3.9 in) before use.

Please refer to the image below for a visual example.

The images above show a comparison of the Shiki Futon Mattress before and after stuffing.

In the BEFORE image, the flat outer fabric casing measures 100 cm × 210 cm. Once filled with cotton filling, as shown in the AFTER image, the futon becomes thicker and gains height. As a result, the finished Shiki Futon Mattress appears slightly smaller in width and length due to the added thickness of the cotton.

However, with regular use, the inner filling gradually settles and flattens, bringing its overall size closer to the original casing dimensions.