I have been given these dimensions: 115 3/8”w x 38”h for a print banner but I don't quite understand what it means! i.e: what is the width & height of the canvas I should work on?

  • 1
    huh? You just posted the dimensions and asked what the dimensions are...? I'm confused.
    – Ryan
    Jul 7, 2015 at 14:15
  • 1
    I mean how do i create a canvas in Photoshop... i.e is the width 115 inch or 3 inch or 8 inch? Jul 7, 2015 at 14:18
  • 2
    115.375 x 38 inches
    – AndrewH
    Jul 7, 2015 at 14:18
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    @ImranBughio It is a fraction for an inch. As there are 8 ticks on a ruler for 1 inch. There is also smaller measurements like 1/16, 1/32. 3/8th converts to .375.
    – AndrewH
    Jul 7, 2015 at 14:20
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    @Andrew if there are 8 ticks to a 1 inch ruler is he reffering 3/8 to 3rd tick of 1 inch which is .25 .50 .75 (3rd ) as per your answer? then what is .375 ?
    – Mohsin
    Jul 7, 2015 at 14:28

2 Answers 2


Well you might not want to use Photoshop but regardless that means 115 inches + 3/8's of an inch is the width, and 38 inches is the height.

As far as if that's the Trim or whatnot, you'd have to ask printer.

If you are using Photoshop you just use a calculator to divide the fraction in this case 3/8 = 0.375 and then add the 115 to find you need to set your Canvas to be 115.375 inches width by 38 inches height.

To be fair the more accurate way to write it would be 115-3/8" but most people are lazy and leave off the hyphen.

  • In that sense does 3/8 means 3 pieces of a inch if whole inch was 8 pieces? Jul 7, 2015 at 14:29
  • ...yes. This is basic math. Just like 2-3/8cm would be 2.375cm. How do you get that? Divide the fraction. Don't let the inch unit confuse you. @ImranBughio
    – Ryan
    Jul 7, 2015 at 14:31

Trim size = Final cut size without the bleed.

Your canvas should be 115 3/8”w x 38”h (115.375 inch x 38 inch) OR 293.05cm x 96.52cm; to this you should add at least 1/4" (0.25") of bleed on each side (or 6 mm on each side).

The total of your canvas should be minimum 115 7/8" x 38 1/2" (115.875" x 38.5") OR 294.32cm x 97.79cm (this includes a bleed).

The poster will be cut to the final size of 115 3/8”w x 38”h (293.05cm x 96.52cm)

See How can I determine how much bleed to use? for more details about bleed.

Safe margin:

You mentioned "trim size" in your question but if you were not told specifically it was a trim size, then make sure to keep an inside safe margin of 1/2" (0.5" or 13mm) on all sides within your layout! This way even if the dimension you were given include a bleed already, there is less chances part of the design will be cut out.

Of course, if you're not certain, the best way to know is always to make sure the printer is talking about "trim" size or the layout size, and to ask the question directly or check on their website if they have one! But trim size means final size once cut.

How to convert imperial units to metric units

It's confusing to work with 3/8, 1/16 fractions and the imperial units if you're used to the metric system.

To know what's the decimal of these numbers, you can always use 1 and divide it by the biggest number on the bottom and then multiply by the small number on top.

Example: 3/8 = 1 divided by 8 then multiplied by 3 = 0.375

Once you have this, you can use Google to convert anything! You simply type your units to unit conversion or the exact numbers you want to convert.

Method 1) Unit to unit conversion in Google

How to convert units to units of measurements inch to centimeters in Google search

Method 2) Exact conversion in Google

How to convert precisely ts inch to centimeters in Google search

I don't know if you prefer centimeters or inches but this should help you find any measurement or convert anything you need.

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