MM to Pixels at 300 DPI

Convert millimeters to pixels at 300 dpi: px = mm ÷ 25.4 × 300. Print-size math for metric users.

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Formula

Pixels = mm ÷ 25.4 × DPI (25.4 mm = 1 inch). At 300 dpi: 1 mm ≈ 11.8 px, 10 mm ≈ 118 px, 100 mm ≈ 1,181 px

Examples

InputResult
50 mm at 300 dpi591 px
100 mm at 300 dpi1,181 px
25 mm at 300 dpi295 px

Frequently Asked Questions

How many pixels is 50 mm at 300 dpi?

50 ÷ 25.4 × 300 ≈ 591 px. For a 50 × 50 mm print that is a 591 × 591 px image.

Why divide by 25.4?

DPI is dots per <i>inch</i>, and 1 inch = 25.4 mm exactly. Converting mm to inches first is the whole trick.

Does 300 dpi change on screen?

Screen density is a separate concept (96 dpi CSS reference, or device PPI). The 300 dpi figure applies to physical printing only.

Related Calculators

DPI to Pixels CalculatorInches to Pixels at 300 DPICM to Pixels at 300 DPI