โ๏ธ DL Envelope
| Millimeters | 110 ร 220 mm |
| Centimeters | 11.0 ร 22.0 cm |
| Inches | 4.33 ร 8.66 in |
| Points | 312 ร 624 pt |
| Picas | 26.0 ร 52.0 pc |
| Pixels (300dpi) | 1299 ร 2598 px |
| Pixels (72ppi) | 312 ร 624 px |
โ๏ธ C4 Envelope
| Millimeters | 229 ร 324 mm |
| Centimeters | 22.9 ร 32.4 cm |
| Inches | 9.02 ร 12.76 in |
| Points | 649 ร 918 pt |
| Picas | 54.1 ร 76.5 pc |
| Pixels (300dpi) | 2705 ร 3827 px |
| Pixels (72ppi) | 649 ร 918 px |
Area: 1 C4 = 1.5 ร DL (C4 is 1.5ร larger). Scaling factor: โ1.5 โ 1.2247 per side.
DL is the standard business envelope (4.33 ร 8.66 in) โ C4 is the standard A4 document envelope. This tool helps you scale up from DL for professional mail.
C4 (area) = DL ร 1.5 ยท Scale factor = โ1.5 โ 1.2247 per side1.5 DL envelopes combine to make 1 C4 envelope (or 1 C4 = 1.5 DL).
๐ What is DL Envelope Size?
DL is the most common business envelope size in the ISO 216 C-series. Its dimensions are 110 ร 220 mm (4.33 ร 8.66 inches), with an area of 0.0242 mยฒ. DL stands for "Dimension Lengthwise" and is designed to hold A4 paper folded into three equal sections (a C-fold or letter fold). It's the standard envelope for business correspondence, invoices, and professional mail. DL is exactly 2/3 the area of C4, making it the most widely used envelope size in offices worldwide.
๐ What is C4 Envelope Size?
C4 is a medium envelope size in the ISO 216 C-series. Its dimensions are 229 ร 324 mm (9.0 ร 12.8 inches), with an area of 0.074 mยฒ. C4 is designed to hold A4 paper without folding (A4 is 210 ร 297 mm). It's the standard envelope size for professional correspondence, business mail, and official documents. C4 is exactly 1.5 times the area of DL, making it the ideal size for A4 documents and professional presentations.
๐งฎ The Math: How DL Becomes C4
The ISO 216 C-series is based on the geometric mean of the A and B-series. DL is a special size that falls between C6 and C5. Each step up (DL โ C4) multiplies the area by 1.5. The side lengths increase by a factor of โ1.5 โ 1.2247.
- Width: 110 mm ร โ1.5 โ 229 mm
- Height: 220 mm ร โ1.5 โ 324 mm
- Area: 0.0242 mยฒ ร 1.5 = 0.074 mยฒ
Formula: 1 C4 = 1.5 ร DL (in area). So, if you have 1.5 DL envelopes, they can be combined to form 1 C4 envelope (or 1 DL = 0.667 C4).
๐ Quick Conversion Table: DL to C4
| DL Envelopes | C4 Equivalent | Scale factor (side) | Realโworld use |
|---|---|---|---|
| 0.5 DL | 0.333 C4 | 100% | Small business mail |
| 1 DL | 0.667 C4 | 122.5% (enlarge) | Standard business envelope |
| 1.5 DL | 1 C4 | 150% | Full A4 envelope |
| 3 DL | 2 C4 | 212.1% | Two professional envelopes |
| 5 DL | 3.333 C4 | 273.9% | Bulk mailing |
| 10 DL | 6.667 C4 | 387.3% | Large mailing campaign |
| 15 DL | 10 C4 | 474.3% | Marketing mailer |
| 30 DL | 20 C4 | 670.8% | Large-scale mail |
โ๏ธ RealโWorld Examples: DL to C4 in Action
- ๐ฆ Business Mail: DL is the standard for invoices and business correspondence. When you need to send A4 documents without folding, C4 is the perfect size. This converter tells you exactly how many DL envelopes fit into a C4 layout.
- ๐ Professional Correspondence: DL is used for everyday business letters. C4 is used for official documents, contracts, and professional presentations. Understanding the scaling helps with consistent branding.
- ๐ฌ Marketing Materials: DL flyers can be designed, and then the same artwork can be scaled to C4 for larger-format mailers or brochures.
- ๐ข Office Correspondence: C4 is the standard for business letters and official documents. DL is used for shorter correspondence and invoices. Convert between them for consistent document management.
- ๐จ๏ธ Printing & Production: Understanding DL to C4 conversion is essential for print production, especially when printing multiple envelope sizes from the same sheet.
๐ก Professional Tips for DL to C4 Scaling
๐ฏ Resolution & Quality
When scaling from DL to C4, if your original is 300 DPI, the resulting C4 will be ~245 DPI โ still acceptable for most printing. For high-quality prints, design at 400 DPI at DL to get ~327 DPI at C4.
๐ CโSeries vs. DL
DL is a unique size that doesn't follow the standard C-series progression. It's designed specifically for business mail with A4 paper folded in thirds. C4 holds A4 paper unfolded.
๐ฐ Printing & Mailing Efficiency
DL envelopes are more cost-effective for everyday business mail. Use C4 for formal documents and professional presentations. Plan your budget accordingly.
๐ Professional Correspondence
DL is the most widely used business envelope worldwide. C4 is the standard for A4 documents. Use this converter to plan your envelope sizes for professional communications.
โ Frequently Asked Questions (DL to C4)
Q: How many DL envelopes equal 1 C4?
A: Exactly 1.5 DL envelopes make 1 C4 in terms of area. You can fit 1.5 DL pages on one C4 sheet.
Q: What is the scaling factor from DL to C4?
A: Each side is scaled by โ1.5 โ 1.2247, meaning you enlarge the width and height by 22.5%.
Q: Can I fit a DL document into a C4 envelope?
A: Yes, by scaling it up to 122.5% on each dimension. The document will fit, with more white space around it.
Q: What is the difference in area between DL and C4?
A: C4 has exactly 1.5 times the area of DL (0.074 mยฒ vs. 0.0242 mยฒ).
Q: Is DL bigger than C4?
A: No, C4 is larger. C4 is the next size up from DL for A4 documents. 1 C4 = 1.5 ร DL.
Q: What is DL used for?
A: DL is used for business correspondence, invoices, standard mail, and professional letters.
Q: What is C4 used for?
A: C4 is used for A4 documents, official correspondence, contracts, and professional presentations.
Q: Can I print DL on C4?
A: Yes, by scaling up to 122.5%. Most printers support this scaling. This tool helps you understand the exact ratio.
Q: What does DL stand for?
A: DL stands for "Dimension Lengthwise" โ it's designed to fit A4 paper folded into three equal sections.
๐ Why Accurate DLโtoโC4 Conversion Matters
Accurate scaling between DL and C4 is essential for professional mail, envelope production, and document management. Whether you're preparing a business letter, designing an invoice, or planning a mailing campaign, this tool ensures your envelopes fit perfectly every time. Inaccurate scaling can lead to wasted paper, misaligned designs, and costly reprints.
๐ Global Standards & Professional Usage
The Cโseries (ISO 216) is used alongside the Aโseries and Bโseries in many countries. DL is the most widely used business envelope size globally. C4 is the standard for A4 documents. This tool supports professional envelope size conversions for users worldwide.
๐ The Full CโSeries Hierarchy
- C8 = 64 ร 91 mm โ small correspondence
- C7 = 91 ร 128 mm โ small envelopes, invitations
- C6 = 114 ร 162 mm โ standard invitations, greeting cards
- C5 = 162 ร 229 mm โ medium envelopes, flyers, professional mail
- DL = 110 ร 220 mm โ business mail, invoices, standard envelopes
- C4 = 229 ร 324 mm โ A4 documents, business envelopes, official mail
- C3 = 324 ร 458 mm โ large mail, catalogs, A3 documents
- C2 = 458 ร 648 mm โ oversized mail, A2 documents
- C1 = 648 ร 917 mm โ very large mail, posters
- C0 = 917 ร 1297 mm โ extremely large mail, display
Each step up follows a specific progression, with DL being a key size for business mail.
๐ Explore More Envelope & Mail Tools
Check out our other converters: C4 to DL, C6 to C5, C5 to C4, C4 to C3, C3 to C2, and more. All designed to make your print and mail workflows smoother.