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Print size calculator

Find the maximum print size of an image from its pixel dimensions and DPI.

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Screen size calculatorCompute a screen's width and height in cm from its diagonal and aspect ratio.Print Cost CalculatorWork out the real cost per page and per job of printing — ink, paper, duplex and printer amortisation — and compare printing at home with a print shop.Audio file size calculatorEstimate an uncompressed audio file's size from its length, sample rate and bit depth.Paper Size Reference (A4, Letter, ISO 216)Every A, B, C and US paper size in mm, cm and inches, pixel dimensions at 72 to 600 dpi, a scale drawing against A4 and Letter, and the √2 rule explained.Photo File Size EstimatorEstimate the pixel dimensions and JPEG, RAW and TIFF file sizes from megapixels, aspect and bit depth.Video file size calculatorEstimate a video's file size from its duration and bitrate.Aspect ratio calculatorFind the aspect ratio of any width and height, like 16:9.Megapixel calculatorCompute the megapixels of an image from its width and height in pixels.

Enter Width (px), Height (px), DPI and the Print size calculator works out Width (inches), Height (inches), Width (cm) straight away. For instance, with Width (px) = 3,000, Height (px) = 2,000 and DPI = 300 it returns Width (inches) = 10, Height (inches) = 6.667 and Width (cm) = 25.4.

How to use it

  1. Enter your values: Width (px), Height (px), DPI.
  2. Read the result instantly: Width (inches), Height (inches), Width (cm).

Frequently asked questions

How does the Print size calculator work?

It takes Width (px), Height (px) and DPI and derives Width (inches), Height (inches) and Width (cm) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

3 values: Width (px), Height (px) and DPI. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Width (px) = 3,000, Height (px) = 2,000 and DPI = 300, the calculator returns Width (inches) = 10, Height (inches) = 6.667 and Width (cm) = 25.4. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Finding out how big a thing will be before you make it: how many gigabytes an hour of footage takes, how long a file needs on the connection you have, how large a photo prints before it goes soft, what bitrate fits the budget you were given.

What is the most common mistake?

Reading a figure in one unit next to a figure in another. Megabits are not megabytes and the eight-fold gap sinks most transfer estimates; a kilobyte is 1 000 bytes to a drive maker and 1 024 to the operating system; pixels are not dots per inch. None of it is hard arithmetic — the unit on each side is what decides whether the answer means anything.

What is the difference between the Print size calculator and the Screen size calculator?

This one returns Width (inches) and Height (inches); the Screen size calculator returns Height (cm). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Print Cost Calculator is the closest one after this: Work out the real cost per page and per job of printing — ink, paper, duplex and printer amortisation — and compare printing at home with a print shop.

What else is worth having open alongside it?

Audio file size calculator and Paper Size Reference (A4, Letter, ISO 216) — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

Byte prefixes follow the IEC convention where a kibibyte is 1 024 bytes and a kilobyte is 1 000 — drive makers use the second, operating systems often report the first, and a disk that shrinks on arrival is that gap and nothing else. Print sizing assumes 300 dpi unless you change it.

Further reading

All guides →
ExplainerHow Big Is That Audio File?Uncompressed audio size is exact arithmetic: sample rate × bit depth × channels × seconds ÷ 8. CD audio is 176,400 bytes per second. A 320 kbps MP3, by contrast, is bitrate × duration and does not depend on the sample rate at all — 2,400,000 bytes a minute whether it came from 44.1 or 48 kHz.ExplainerScreen Resolution, Pixel Density, and the Numbers Marketing UsesA diagonal plus an aspect ratio gives you width and height by Pythagoras, and the answer is not what the marketing implies: a 27-inch 21:9 has 16.2% less area than a 27-inch 16:9. Then pixels per degree, which shows the highest-PPI phone is not the sharpest thing you own.ExplainerCrop Factor: What It Changes and What It Does NotCrop factor is a ratio of sensor diagonals. It changes framing, not the lens — proved by computing field of view both ways — and it applies to the f-number as well as the focal length, which is the half most articles leave out.ExplainerFrame Rates, Timecode, and the Drop-Frame That Drops NothingFrames = duration × rate is trivial until the rate is 29.97. Non-drop timecode then drifts exactly 3.6 seconds an hour. Drop-frame corrects it by skipping 108 frame numbers — the same 108 — but the correction is not perfect: counting every frame shows a residual of 3.6 milliseconds per hour.ExplainerPrinting A4 on Letter Shrinks It to 94 %A4 and US Letter differ by 5.9 mm one way and 17.6 mm the other, so "fit to page" scales the whole document to 94 %. Ten-point type becomes 9.4, and a plan drawn to scale is wrong by six per cent.ExplainerWhat Are PPI and DPI? Pixel Density for Screen and PrintPPI and DPI both measure density per inch, but one is about screens and the other about print. Learn how to compute pixel density and what Retina really means.