Bleed Calculator
Work out the document size with bleed, the safe area inside the trim, and the finished size after cutting.
Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server.
How to use the bleed calculator
- Fill in the fields — they start with a worked example.
- Read the answer, and the arithmetic shown beneath it.
- Copy the results, or adjust the inputs to compare scenarios.
About this tool
Guillotines are accurate to about a millimetre, and a stack of sheets shifts slightly as it is cut. So artwork that stops exactly at the finished edge will, on some copies in the run, leave a hairline of white paper along one side. Bleed is the fix: extend the background past the trim line, cut through it, and every copy is clean whichever way the blade wanders.
The same tolerance applies inwards, which is what the safe area is for. Text or a logo sitting three millimetres from the trim looks fine on screen and looks alarmingly close to the edge on the copies that cut short. Keeping content inside the safe margin means the worst cut in the run still looks deliberate.
Three millimetres of bleed is the standard across most of the world, with an eighth of an inch used in the US and larger allowances on thick board or anything that will be folded. Check the printer's specification before you supply the file — this calculator gives the numbers, but their template is the authority.
Common uses
- Setting up a business card or flyer document at the size a printer expects.
- Checking that text sits far enough inside the trim to survive cutting.
- Converting a finished size into the document size to export as PDF.
Frequently asked questions
- How much bleed do I need?
- Three millimetres is the usual standard, or an eighth of an inch in the US. Thick card, folded work and large-format jobs often ask for 5 mm or more.
- What is the difference between bleed and safe area?
- Bleed is background extended outside the trim line so cutting never exposes white paper. The safe area is the margin inside the trim where text stays clear of the blade.
- Do I need bleed if my design has a white background?
- No. If nothing but white reaches the edge, a cut a little inside or outside the line is invisible, so bleed adds nothing.
Related tools
Print Margin Calculator
Work out the printable area and content width left on a page after margins and binding gutter.
Paper Size Converter
Convert any standard paper size between millimetres, inches, points and pixels at a chosen resolution.
Print Size Calculator
Work out how large an image can be printed at a given resolution, in inches, centimetres and standard photo sizes.
Resize PDF Pages
Change every page to A4, Letter or another standard size, scaling content to fit.