Choose what you know
Start with pixels and PPI, size and PPI, or pixels and physical size.
Three modes · exact physical-unit factors
Know what your pixels mean at the print size you choose.
DpiCalc solves the missing value in pixels = inches × PPI, calculates both axes independently, and keeps every entered value in the browser.
No account, image upload, resampling, quality guarantee, backend, or generated result URL.
Three visible decisions
Choose the unknown, keep axes separate, inspect rounding
Enter width and height
Independent axes expose aspect-ratio mismatches instead of hiding them.
Read the rounding contract
Required pixels use a ceiling; recurring physical decimals are labelled approximate.
Focused print arithmetic
Useful numbers without pretending to certify a print
- Existing pixels to physical print size.
- Target size and PPI to required whole pixels.
- Pixels and target box to effective PPI per axis.
- Exact inches, centimetres, and millimetres.
Two known values
Keep pixels, physical size, and PPI in one visible equation
Choose the unknown, enter dimensions, and inspect exact unit conversion and explicit whole-pixel rounding.