How this calculation works
Expand trim dimensions by bleed on both edges. Either crop the source aspect ratio to fill that canvas or fit the full source within it, then compare effective source PPI with the entered target.
Effective PPI = retained source pixels / placed inches; required canvas pixels = ceil(canvas inches × target PPI)A worked example
A 6,000 × 4,000 pixel image printed at 30 × 20 cm with no bleed has 508 source PPI. A 300 PPI canvas needs 3,544 × 2,363 pixels after upward rounding.
Good to know
Dimension planning only, not an image editor. PPI is not printer-dot DPI. Fit may leave blank bleed; no sharpness, color, press acceptance or upscaling guarantee.
Reference: Adobe: image resolution and print dimensions (opens in a new tab) ↗
Image pixels and printer dots are different
PPI counts image pixels across a physical printed inch. Printer DPI describes the device’s marking dots, which need not correspond one-for-one to image pixels. This page uses PPI for the raster-image calculation.
Changing a file’s resolution metadata alone does not create genuine source detail. The tool compares existing source dimensions with an entered target and reports the raster canvas dimensions needed for that target.
The camera field of view and scene coverage calculator adds calculate rectilinear horizontal, vertical and diagonal viewing angles, plus scene width and height at an entered distance and additional crop.
Bleed extends every side
A three-millimetre bleed adds six millimetres to the full width and six to the full height. The calculator applies that extension before matching aspect ratios, so the source crop can change when bleed changes.
The requested canvas includes bleed, while the trim rectangle is the final intended cut size. Keeping those rectangles separate avoids accidentally treating the finished trim as the complete artwork boundary.
Crop and fit preserve different things
Centered crop fills the full canvas and may remove source edges. Fit retains the entire source image but can leave blank margins. Neither mode knows whether an important face, label or subject lies near a crop boundary.
Crop geometry can contain fractional source coordinates before resampling, which is normal in a continuous layout model. This calculator does not modify an image file or supply content outside its original edges.
Use the result with the next measurement
The camera field of view and scene coverage calculator plans what a rectilinear lens captures. Field of view is separate from the print PPI and crop decisions made after an image has been captured.
Dimension planning only, not an image editor. PPI is not printer-dot DPI. Fit may leave blank bleed; no sharpness, color, press acceptance or upscaling guarantee.
A few questions, answered
Does this crop my image?
No, it computes geometry only.
Is bleed entered per edge?
Yes, it is added to both sides of each dimension.
Does fitting guarantee printable bleed?
No, blank margins can extend into the bleed area.