Free aspect ratio calculator for photo cropping
Aspect ratio calculator for photo cropping: enter two values, get the third. Country presets for ID frames and reduced ratios like 35:45 = 7:9. Free.
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How it works
- 1Type any two values: width, height, or ratio.
- 2Or pick a passport/ID preset for the exact spec.
- 3Read the missing value + the simplified ratio (e.g. 7:9).
Frequently asked
What aspect ratio is a passport photo?
Depends on the country. ICAO standard is 35×45 mm (ratio 7:9 ≈ 0.778). US passports are 2×2 inch (1:1 square). India is 35×35 mm (1:1) for visa, 35×45 mm (7:9) for passport. Japanese ID is 30×40 mm (3:4).
How is the simplified ratio computed?
Greatest Common Divisor (GCD): for 35×45 the GCD is 5, so 35÷5 : 45÷5 = 7:9. We compute it on integer mm values for exactness.
Can I use this for video (16:9, 9:16) too?
Yes — the math is identical. Pick the "Video / generic" preset for 16:9, 9:16, 4:3, 1:1 Instagram, etc.
Want the exact crop done for you?
Anfas.Pro auto-crops your photo to the exact ratio and head size your document needs — no manual math.