Passport Photo Head Size & Eye Line — the Numbers Behind the Machine Check
Most passport pages tell you how big the photo is. What actually gets photos bounced is how big your head is inside it — and where your eyes sit. Both are written as hard numbers, and automated checks measure them before a human ever looks. Here are the bands, the two countries' numbers side by side, and how to measure your own shot in a minute. Verified against the UK HMPO photo standards and the US State Department photo rules, September 2026.
The 15-second answer
- Your head has to fill a set band, measured chin to top of head — not roughly, but within a few millimetres.
- The US band is 25–35 mm on a 2 × 2 inch (51 × 51 mm) photo.
- The UK band is 29–34 mm on a 45 × 35 mm photo — a tighter window than the US one.
- The automatic check is about geometry, not tidiness: photo size, your distance from the camera, your eye position and any head tilt.
The two numbers that matter
The first is the head height — the distance from the bottom of your chin to the top of your head, in millimetres. The second is where your eyes fall in the frame, which the machine reads as an eye-position band. Get the head size wrong by a centimetre and the photo can be technically flawless and still fail.
The mistake most people make is measuring the photo, not the head. A 51 × 51 mm image with a small head in the middle of it fails the US standard just as surely as an oversized one; the print size being right says nothing about the head band being right.
Country bands side by side
United States: 25–35 mm
The US printed photo is 2 × 2 inches (51 × 51 mm), and the head must measure between 1–1⅜ inches (25–35 mm) from the bottom of the chin to the top of the head. The guidance also gives a shooting distance: the camera should be several feet — about 1.2 m — away from you.
United Kingdom: 29–34 mm
The UK photo must be 45 mm high by 35 mm wide, and the head must measure between 29 mm and 34 mm from the crown (top) of the head to the bottom of the chin. That window is narrower, so a shot that just scrapes into the US band can sit outside the UK one.
Why the US band is written two ways
The US guidance expresses the same band in both fractional and decimal form — 1 to 1⅜ inches, and 1 to 1.4 inches (25 to 35 mm). They describe one specification; you do not have to satisfy two different numbers, but you will see both forms quoted, so it helps to recognise them as the same band.
Eye line and head tilt — what the machine checks
The UK standard sets out what the automated digital check actually examines: the size of the photo, the customer's distance from the camera, the customer's eye position and any head tilt. That is the practical list to pre-empt. On tilt, the UK requires you to squarely face the camera with a straight head, and rejects photos where the face or head is hidden, tilted backward, forward or to the side, turned to one shoulder or at an angle, or facing left or right. The US line is the same in plain terms: face the camera directly with your full face in view and your head not tilted.
How to measure your own shot in 60 seconds
- ☐ Open the photo at a known size (your target print size) so millimetres are meaningful.
- ☐ Measure chin to top of head — the top is the crown, not your hairline.
- ☐ Compare against the band for your country: 25–35 mm (US) or 29–34 mm (UK).
- ☐ Check your eye line sits sensibly inside the frame, not pushed to the top edge.
- ☐ Check the head is straight — no tilt forward, back or to one side.
- ☐ If you are between sizes, aim mid-band rather than at an edge.
Shooting distances that land you in the band
The single biggest lever is how far the camera is from you. The US guidance suggests the camera be several feet (about 1.2 m) away — far enough that the head fills the frame naturally rather than bulging toward the lens. Standing too close makes the head look large and distorts the face; standing too far makes it too small. Shoot, measure, then adjust your distance rather than trusting the framing on the screen.
If the check fails: crop, re-shoot, or re-print
- Crop when the shot is otherwise good and the head is simply framed wrong — crop to the target print size and re-measure the band (the image cropper does this by proportion).
- Re-shoot when the head is genuinely too large or too small for the frame and cropping would cut off hair or shoulders.
- Re-print when the digital file is right but the print came out at the wrong scale — confirm the printer is not set to "fit to page", and use the print calibration check.
The head band sits inside the wider rules — see the top rejection reasons (head size is a frequent one) and, if you are shooting at home, the step-by-step how-to and at-home guide.
60-second geometry check
- ☐ Head measured chin-to-crown, not photo measured
- ☐ Head height inside the band (US 25–35 mm / UK 29–34 mm)
- ☐ Eyes sitting in a sensible position, not at the very top
- ☐ Head straight — no tilt or turn
- ☐ Camera distance around 1.2 m, not close to the face
- ☐ If printed, checked at true scale (no "fit to page")
Frequently asked questions
How big should my head be in a passport photo?
It depends on the country. The US requires the head to measure 25–35 mm from the bottom of the chin to the top of the head on a 2 × 2 inch (51 × 51 mm) photo. The UK requires 29–34 mm from crown to chin on a 45 × 35 mm photo.
What is the US head size rule exactly?
The US photo is 2 × 2 inches (51 × 51 mm), and the head must be between 1 and 1⅜ inches (25 to 35 mm) from chin to top of head. A common shooting distance is about 1.2 m from the camera.
What is the UK head size rule?
The UK photo must be 45 mm high by 35 mm wide, with the head measuring 29–34 mm from the crown of the head to the bottom of the chin.
What does the automatic check measure?
Under the UK standard the automatic check covers the size of the photo, your distance from the camera, your eye position and any head tilt.
How do I measure my head height at home?
Open the photo at its true print size so millimetres are meaningful, then measure from the bottom of the chin to the top of the head (the crown, not the hairline) and compare against your country's band.
Can I fix a wrong head size without re-shooting?
Often yes. If the shot is otherwise good, crop to the target print size and re-measure — but if the head is genuinely too large or small for the frame, re-shoot rather than crop into hair or shoulders. If the file is correct and only the print is off, fix the print scale instead.
UK figures come from the HMPO photo standards for examiners (v51.0); US figures from the State Department photo guidance — both checked September 2026. The print size of the photo is a separate question from the head band; every format is on the size chart, with country pages for the US and UK.