40MPH Speed Square Blanket


• 100% polyester sublimated MPH calculator on front
• Instruction label on bottom right corner
• Blue 80% cotton, 20% polyester fleece on back
• Eyelets for hanging on each corner
• Machine washable and dryer safe
• 100% Made in USA
• Dimensions: 96" x 48"

Instructions for Speed Calculator Use:

• Set your phone or camera to film in ‘Slow Mo’ at 240 FPS (frames per second) and film an object as it travels across the grid on your Speed Square Blanket.

• Each Square is 2.19 inches and is equivalent to 1 MPH (mile per hour)

• Watch your video and count the number of squares the object travels in exactly 1 ‘Slow Mo’ second

• If your phone/camera records at 120 fps, then count the number of squares it travels in 1 ‘Slow Mo’ seconds and divide by 2. NOTE: some phones might record at 120 FPS by default but still have the ability to increase that to 240 if you check the settings.

• YOU DID IT! If your object travels 20 squares in 1 ‘Slow Mo’ Second then your item is traveling at 20 MPH!

• To calculate KPH (kilometers per hour) is easy! Just multiply your MPH by 1.6

This blanket is 40 squares wide, making it a 40 MPH blanket. If you want to measure speeds up to 80 MPH you can use two blankets and lay them end to end.
If you want to measure the speed of light, you’re going to need about 16.7 Million blankets. No big deal :)If you’ve already got plenty of blankets but still want to experiment with the science then try the following.  Measure out 2.19" squares on a piece of paper. You can fit 5 on a regular sheet of printer paper, which means you can measure up to 5 MPH. Just remember, more squares = more MPH

NOTE: This blanket is designed for objects traveling horizontally (where the speed isn’t affected by gravity). If you want to know the final speed of an egg dropped from a building right before impact for example then use this formula: Final speed = 1.25 x number of squares + 1.09

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Melissa H.
United States

We love it

Great. My son loves to video things flying across the screen and he even sleeps with the blanket. Good purchase

Ryan J.
United States United States


Bought this for my son for Christmas. Cool teaching tool and very functional as a blanket.

Sandra C.
United States United States

Great design!

The blanket is great. My son uses it as his bed spread. It's warm enough to keep him comfortable, but not too heavy. The loops to hang it for taking speed videos is really convenient! Great design--would MR have done anything less?!

Margaret S.
United States United States

Nice Blanket, Great Idea

Our son loves this blanket. He sleeps with it every night. We still have to figure out how to use it for it’s designed purpose though. Hehe.

Mary A.
United States United States

40 MPH Speed Square Blanket

I have been using this blanket for a month now and I love it the slow-mo works like Intended and the blue screen is amazing this is definitely 5 stars. This was written by my nephew not me he's the one using it. Thomas Dort

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