Duvet Sizes and Dimensions: A Complete Guide

Here's an accurate and clear breakdown of the various bedding sizes for a "small double bed" and corresponding duvet, fitted sheet, flat sheet, and duvet cover sizes. The values are presented in both inches and centimeters for your clarity.

Explanation of Sizes:

Mattress & Bed Size: A small double bed typically measures 48 inches wide by 75 inches long (120 x 190 cm). 

Fitted Sheet: Ensure you use a fitted sheet that matches the mattress size: 48 x 75 inches (120 x 190 cm). Be mindful of the mattress depth; typically, fitted sheets can accommodate a mattress depth of 10–14 inches (25–35 cm), depending on the sheet. 

Flat Sheet: For a small double bed, a flat sheet measuring 70 x 102 inches (178 x 259 cm) is generally recommended, which provides enough length to tuck in on all sides. 

Duvet Cover: The duvet cover should match the size of the duvet, typically 70 x 86 inches (178 x 218 cm), providing good coverage for a small double bed. 

Duvet: For comfort, use a duvet that is also 70 x 86 inches (178 x 218 cm) for a proper fit on your small double bed. 

How to Choose the Right Duvet Size?

To choose the right duvet size for your mattress, you need to consider the dimensions of your mattress, the amount of overhang you want, and how you sleep. Here’s a precise and scientific approach to make sure you select the appropriate duvet size.

Steps to Choose the Right Duvet Size:

Measure Your Mattress: Start by accurately measuring the width and length of your mattress. For example, if you have a standard mattress:

A single mattress is typically 36 inches (90 cm) wide and 75 inches (190 cm) long.

A double mattress measures 54 inches (135 cm) wide and 75 inches (190 cm) long.

A king-size mattress is usually 60 inches (150 cm) wide and 80 inches (200 cm) long.

Add Overhang: For adequate coverage, especially if you share the bed or prefer extra warmth, you’ll want to ensure the duvet extends beyond the sides of the mattress.

A good rule of thumb is to add 12 to 16 inches (30 to 40 cm) of overhang on each side.

For example:

If your mattress is 54 inches (135 cm) wide, aim for a duvet that is at least 78 to 86 inches (198 to 218 cm) wide.

Duvet Length: The length of the duvet should match the mattress length or slightly exceed it, especially if you want extra coverage at the foot of the bed. Ideally, choose a duvet that is 10 to 12 inches (25 to 30 cm) longer than the mattress to ensure comfort and full coverage.

For example:

For a mattress that is 75 inches (190 cm) long, a duvet length of 85 to 87 inches (215 to 220 cm) would be appropriate.

Consider Sleeping Habits: If you tend to move a lot during sleep or share the bed, opt for a duvet larger than the mattress size. For instance, if you have a double mattress, you might want a king-size duvet to ensure ample coverage.

Example Calculations:
For a double mattress measuring 54 inches (135 cm) wide and 75 inches (190 cm) long:

A duvet should be approximately 78 to 86 inches (198 to 218 cm) wide and 85 to 87 inches (215 to 220 cm) long.