How do I determine the right flat sheet size for my bed?

First decide whether you'll use it as a top sheet (it goes over you) or bottom sheet (it goes under you). For a bottom sheet, measure your mattress width, length and depth, then calculate width as (mattress width + 2× mattress depth + 60cm) and length as (mattress length + 2× mattress depth + 60cm). For a top sheet, match approximately your duvet size.

What size flat sheet do I need for an Emperor bed?

For an Small Emperor, which is 200cm wide, you’ll need a flat bottom sheet that is a minimum of 300cm wide. For a large Emperor bed (215cm/7' wide), you’ll need a flat bottom sheet about 350cm wide. For top sheets, match your emperor duvet dimensions – usually 290cm wide.

What's the difference between a flat sheet and a fitted sheet?

A flat sheet is a rectangular piece of fabric designed to lay flat over your mattress with excess material to tuck in, while a fitted sheet has elasticated corners to wrap around and secure to your mattress.

Can I order a custom size flat sheet for my non-standard bed?

Absolutely. At The Big Bed Company, we specialize in making custom size flat sheets for any bed dimension, ensuring a perfect fit for your unique requirements.

How much overhang should a flat sheet have?

For a bottom sheet, we recommend at least (mattress depth + 30cm) of overhang on each side to ensure it stays tucked in. This means a total additional width of (2× mattress depth + 60cm) beyond your mattress width.

Should my flat sheet be the same size as my duvet?

If you're using the flat sheet as a top sheet (thew sheet lies over you), then yes, it should be approximately the same size as your duvet for proper coverage. If using as a bottom sheet, it should be larger to allow for tucking in.

EMPEROR & CUSTOM FLAT SHEET SIZES

We make our flat sheets to any size, but our standard sizes are shown below. We stock larger flat sheets in our Standard Ranges. Our Premium Ranges are made-to-order.

✔ Choose your fabric
✔ Then your mattress size
✔ Scroll down to the flat sheet section
✔ Add to cart

Buy Extra Large Flat Sheets

Recommended flat sheet sizes

Single size

200 x 275 cm

Prince size

245 x 275 cm

King size

275 x 275 cm

Super King

305 x 305 cm

Small Emperor (Eastern King)

305 x 305 cm

Emperor & Caesar

350 x 350 cm

Our most popular size!

View All Flat Sheets

Emperor Flat Sheets – A Sizing Note

If you are looking for a flat sheet for an Emperor bed, first check your mattress size:

• If it is 200cm wide, it is a Small Emperor / Eastern King
• If it is 215cm wide, it is a Standard Emperor

Our flat sheets for both emperor types are generously sized for use as bottom sheets. For top sheets, you may wish to size down slightly, as these do not need to be tucked under.

Can't Find Your Exact Bed Size?

We specialize in making flat sheets to any size. Whether you have a custom size bed, a bespoke mattress, or are after a top sheet rather than a bottom sheet, we can make these for you.

Request Custom Sizing

Why Choose Our Flat Sheets?

✓

Premium Quality

Made from the finest cotton for exceptional comfort and durability

✓

Perfect Fit Guarantee

Our sheets are precisely sized to fit your mattress perfectly

✓

Made in the UK

Locally crafted with attention to detail and quality control

Find Your Perfect Flat Sheet Today

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Width x Length	6’6” / 200cm	6’9” / 205cm	7’ /215cm	7’3” / 220cm
Single	3' x 6'6" 90 x 200 cm	3' x 6'9" 90 x 205 cm	3' x 7' 90 x 215 cm	3' x 7'3" 90 x 220cm
Prince	4' x 6'6" 120 x 200 cm	4' x 6'9" 120 x 205 cm	4' x 7' 120 x 215 cm	4' x 7'3" 120 x 220cm
King	5' x 6'6" 150 x 200 cms	4' x 6'9" 150 x 205 cm	4' x 7' 150 x 215 cm	4' x 7'3" 150 x 220cm
Super King	6' x 6'6" 180 x 200 cms	6' x 6'9" 180 x 205 cm	6' x 7' 180 x 215 cm	6' x 7'3" 180 x 220cm
Eastern King	6'6" x 6'6" 200 x 200 cms	6'6" x 6'9" 200 x 205 cm	6'6" x 7' 200 x 215 cm	6'6"" x 7'3" 200 x 220cm
Emperor	7' x 6'6" 215 x 200 cms	7' x 6'9" 215 x 205 cm	7' x 7' 215 x 215 cm	7' x 7'3" 215 x 220cm
Caesar	8' x 6'6" 245 x 200 cms	8' x 6'9" 245 x 205 cm	8' x 7' 245 x 215 cm	8' x 7'3" 245 x 220cm