Print Size Calculator
Find the maximum print size from any film format, or calculate the scan resolution needed for your desired print.
Calculate print size
Choose what you want to find out
Maximum print sizes for 35mm (36×24mm) at each quality level:
Excellent
300 DPI — Gallery prints, close viewing distance
23.6 × 15.7″
60.0 × 40.0 cm
Good
240 DPI — High quality, normal viewing distance
29.5 × 19.7″
75.0 × 50.0 cm
Acceptable
150 DPI — Large prints viewed from a distance
47.2 × 31.5″
120.0 × 80.0 cm
Based on ~5,000 effective PPI from the negative (small format film resolving power).
Negative size, scan resolution, and print quality
The maximum size you can print from a negative depends on three things: the physical size of the negative, the resolving power of the film (how much detail the emulsion can capture), and the print resolution you need for acceptable quality.
Larger negatives capture more total information simply because they cover a bigger area. A 4×5″ negative has roughly 13 times the area of a 35mm frame, which is why large format photographers can make enormous prints with ease.
When scanning, the scanner must resolve enough detail from the negative to produce the required pixels for your print. The formula is:
Scan DPI = (Print dimension × Print DPI) ÷ Negative dimension (inches)
For example, to make a 16×20″ print at 300 DPI from 35mm film (36mm wide, or 1.42″):
Scan DPI = (20 × 300) ÷ 1.42 = 4,225 DPI
These are theoretical maximums. Actual print quality depends on lens sharpness, focus accuracy, film grain, and enlarger or scanner quality.
Need to calculate scan resolution from pixel dimensions instead?
DPI / Resolution Calculator →Stay in the loop
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