How To Select The Correct Sized In Ground Winter Pool Cover

WRITTEN BY:  Inyo Pools

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Getting ready to winterize your swimming begins with purchasing the correct size cover. Here a few tips that will help you choose the correct size.

Things You'll Need

Tape Measure

Note pad

Step by Step


Step 1

Measure the size of the pool. Make certain to include the step section in your measurements if they extend past the pool. A standard in ground winter cover comes rectangular in shape. Record your measurements in a note pad.

Step 2

Take into consideration how low you plan to drop the water level. Most pool covers will come with enough material to compensate for a water level that is reduced up to 12". If you need to drain the water level more than that, you will need to purchase a larger cover.

Step 3

Keep in mind that if you have a step section the extends past the pool, you will need a winter cover large enough to cover it. The winter cover can't be cut to the shape of the pool. If you need a winter cover that follows the shape of the pool, you will need to purchase a safety pool cover.

Step 4

You will also want to take into consideration any obstacles along the pool's perimeter that can't be removed such as ladders, rails and water features. Since the cover can't be cut, the cover will need to be large enough to go around these items.

Step 5

Once you have received your new winter cover, carefully remove it from the box and measure it to ensure it is the correct size. If it is incorrect, please contact the dealer you purchased the cover from for further instruction.


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Inyopools  Posted: 07/06/2018 11:21 AM  Inyo Product Specialist

Hello JD - Safety covers have to be specific to the size of the pool. Your pool would require a customer safety cover. If you send us a completed custom safety cover measuring form, we can send you a quote.

JD  Posted: 07/05/2018 17:53 PM 

I have a 40.3 feet X 15 feet 9 inch pool. What size of safety pool cover should i go for?

Inyopools  Posted: 04/09/2018 15:42 PM  Inyo Product Specialist

Hello Bob - Specific strap placement would require a custom cover. Submit a support ticket here and our cover specialist will contact you.

Bob in NJ  Posted: 04/07/2018 14:35 PM 

my pool is 20 x 40, with a 4 x 8 center step at the shallow end. I have existing anchors for the existing winter cover; may I specify where the straps will go?

Inyopools  Posted: 10/11/2017 14:38 PM  Inyo Product Specialist

Rosie - You may need to buy a custom cover. Please call us at 407-834-2200 and one of our service reps will help determine what you need.

Rosie  Posted: 10/05/2017 19:47 PM 

We have a 12 by 24 rectangular pool with four steps that one and what size cover do we need?

jayswalls  Posted: 09/02/2017 8:45 AM 

I have a 16x34 kidney shaped pool will a 21x41 size cover be the recommended size

Inyopools  Posted: 08/29/2017 11:16 AM  Inyo Product Specialist

jp - I'd suggest calling us at 407-834-2200 and taking to one of our service reps to see if you need a custom designed cover.

jp  Posted: 08/28/2017 14:37 PM 


I have a 16 1/2 x 34 1/2 grecian pool with a permanent slide 1 foot off the coping and three total feet on the other side of the pool. I also have a steps on the left side.

What size pool cover would I need?

Thank you

Inyopools  Posted: 08/28/2017 13:29 PM  Inyo Product Specialist

Anonymous (Oval Pool cover) - You may have to buy a custom designed cover to fit your oval pool. Call us at 407-834-2200 for more information.

Inyopools  Posted: 08/20/2017 11:50 AM  Inyo Product Specialist

Matt - I would figure that the 3' step extension adds 3' to your pool length, making it 43" long. The listed pool size closest to your extended pool dimensions is 20' x 44' which requires a 25' x 49' cover. See our "Swimming Pool Winter Covers" product page for our cover options.

Inyopools  Posted: 08/20/2017 11:35 AM  Inyo Product Specialist

Anna - You will need a 30' x 50' winter pool cover for your 25' x 44' pool. See our "Swimming Pool Winter Covers" product page for our cover options.

Matt  Posted: 08/14/2017 20:41 PM 

My pool is 20' x 40' with a 3 ft. step extension centered on the 20' width (adds 3 ft to the 40' length). What size pool cover do you recommend?

Anna  Posted: 08/14/2017 15:05 PM 

My pool is 25 X44 rectangular. What cover size do I need?

Inyopools  Posted: 06/13/2017 23:43 PM  Inyo Product Specialist

kcox31 - I'd recommend the 30' x 50' cover for your 20' x 45.5' pool.

kcox31  Posted: 06/13/2017 8:16 AM 

my pool is 20 x 45.5, what size do I need?

Inyopools  Posted: 10/24/2016 12:28 PM  Inyo Product Specialist

Kathy - According to Step #3 of this guide, you ordered correctly. If your steps are on the right side when standing in the shallow end, you needed a right cover. If you ordered from us, give one of our service reps a call at 888-367-3082 and we will correct your order.

Kathy  Posted: 10/23/2016 8:56 AM 

Pool is 18 wide by 36 long. When standing at shallow end steps are on the right hand side of the shallow end. I ordered a right hand step cover and it isn't correct. Should this be a left had cover?

Inyopools  Posted: 09/05/2016 13:30 PM  Inyo Product Specialist

Edward - You are going to have to order a customized pool cover. Please talk to one of our services reps at 877-372-6038 and they will take you through the ordering process.

Edward  Posted: 09/02/2016 18:18 PM 

pool size 20x40 with 12x12 L shape what size cover do i need ?

inyopools  Posted: 12/31/2015 10:15 AM  Inyo Product Specialist

dshaw - Unfortunately we do not carry an electronic winter cover.

dshaw  Posted: 12/28/2015 13:21 PM 

Do you carry electronic replacement pool cover for 20x40 inground pool?

Inyopools  Posted: 11/16/2015 11:08 AM  Inyo Product Specialist

Bud - Based on your pool size, you would go with a standard 25' x 49' winter cover.

Bud  Posted: 11/12/2015 17:07 PM 

My pool is 42' x 16'6",that includes a 3'6"extension. There is a ladder on the side. What size do I need?