51×51mm (2×2 inches) Photo Size — Complete Conversion Guide

The US passport standard, also known as 2×2 inches. Used by the United States, India, Kenya, and several other countries. This square format is designed to accommodate both portrait and landscape compositions while maintaining facial recognition compliance for US biometric requirements.

51×51mm (2×2 inches) Size Conversions — Pixels, Inches & DPI

Millimeters

51 x 51

Inches

2.01 x 2.01

Centimeters

5.1 x 5.1

DPI	Width (px)	Height (px)	Total Pixels	Quality
150 DPI	302 px	302 px	91,204	Low
200 DPI	402 px	402 px	161,604	Medium
300 DPIStandard	602 px	602 px	362,404	High
600 DPI	1205 px	1205 px	1,452,025	Ultra

Printing Tips

Fits 4 photos on 4×6" paper, 6 photos on 5×7" paper. Widely available at US drugstores and photo centers.

Countries Using 51×51mm (2×2 inches) Photo Size

🇺🇸

United States

🇮🇳

India

🇰🇪

Kenya

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Frequently Asked Questions

What are the exact pixel dimensions for US passport photos?

The US State Department requires 2×2 inch (51×51mm) photos at a minimum of 600×600 pixels (about 300 DPI). For best results, use 600 DPI which gives you 1205×1205 pixels, ensuring sharp detail for biometric scanning.

Why does the US use a square format instead of the ICAO standard?

The United States adopted the 2×2 inch square format before the ICAO standardized on 35×45mm. The square format allows flexibility in cropping for both passport booklets and visa stamps while maintaining consistent facial dimensions.

Can I use a 2×2 inch photo for Indian passport applications?

Yes, India accepts 2×2 inch (51×51mm) photos for passport applications. However, India also has specific requirements about background color (white), matte finish, and recent date, so ensure all criteria are met.

Where can I print 2×2 inch photos in the US?

Most US drugstores (CVS, Walgreens, Rite Aid), retail stores (Walmart, Costco), and professional photo studios offer 2×2 inch passport photo printing services, typically providing 2 photos for $10-15.