Multi-Unit Photo Converter & DPI Calculator
Passport Size Photo Converter
Millimeter (mm), Centimeter (cm), Inch (in) और Pixels के बीच 100% सटीक गणितीय रूपांतरण।
Example: 35mm passport width
1 inch = 25.4 mm exactly
Mathematical Conversion Formulas for Photo Sizing
Digital image files operate on pure pixel grids, whereas physical identity cards require precise physical millimeter measurements. Converting between the two requires standard DPI scaling.
MM → Pixel Formula
Pixels = (mm / 25.4) × DPI
1 inch is exactly 25.4 millimeters by international definition.
CM → Pixel Formula
Pixels = ((cm × 10) / 25.4) × DPI
Multiply cm by 10 to get mm, then divide by 25.4 and multiply by DPI.
Inch → Pixel Formula
Pixels = Inches × DPI
Direct multiplication of inch measurement by dots per inch resolution.
Instant Quick-Lookup Conversion Table
| Metric (MM) | Metric (CM) | Imperial (Inch) | Pixels @ 300 DPI | Pixels @ 600 DPI |
|---|---|---|---|---|
| 25 mm | 2.5 cm | 0.98 inch | 295 px | 591 px |
| 35 mm | 3.5 cm | 1.38 inch | 413 px | 827 px |
| 45 mm | 4.5 cm | 1.77 inch | 531 px | 1063 px |
| 50 mm | 5.0 cm | 1.97 inch | 591 px | 1181 px |
| 51 mm (2") | 5.08 cm | 2.00 inch | 600 px | 1200 px |
| 70 mm | 7.0 cm | 2.76 inch | 827 px | 1654 px |
Need to crop an image to exact ratio?
Use our free in-browser cropper with locked 7:9 and 1:1 aspect ratios.
Knowledge Base & FAQs
Frequently Asked Questions (अक्सर पूछे जाने वाले सवाल)
Passport size photo ratio, dimensions aur print formats se jude zaroori prashn.
MM ko Pixel me convert karne ka formula kya hai?▼
फार्मूला:
Pixels = (Millimeters ÷ 25.4) × DPI। उदाहरण के लिए, 35mm चौड़ाई को 300 DPI पर कन्वर्ट करने के लिए: (35 ÷ 25.4) × 300 = 413 Pixels।CM ko Pixel me kaise convert karte hain?▼
फार्मूला:
Pixels = ((Centimeters × 10) ÷ 25.4) × DPI। उदाहरण: 4.5 cm ऊंचाई को 300 DPI पर: (45 ÷ 25.4) × 300 = 531 Pixels।Photo DPI ka pata kaise lagayein?▼
यदि आपके पास फोटो के पिक्सल और वास्तविक साइज (इंच में) है, तो:
DPI = Pixel Count ÷ Physical Size in Inches। यदि 600 पिक्सल 2 इंच में फैले हैं, तो DPI = 600 ÷ 2 = 300 DPI।