The most common misconception when choosing filter paper is judging solely by the size of the machine. In reality, the geometry and volume of the filter paper must perfectly match the filter cup to ensure even extraction.
- Manual Pour-Over Filter Cup Matching Matrix
Pour-over coffee requires an extremely high degree of filter paper fit. The following is a precise matching guide for conical and fan-shaped filter cups: - Automatic Drip Machines Matching List
Automatic coffee machines typically use fan-shaped filter paper. If the size is too large, the edges of the filter paper will bend over, causing grounds to enter the coffee liquid; if the size is too small, overflow will occur.
Suitable for small/single-person machines using No. 2 filter paper:
| Filter cup brand/model | Recommended filter paper size | Physical capacity (Yield) | Key Notes |
| Hario V60-01 | No. 1 / V01 | 1-2 cups (150-300ml) | The conical structure requires the use of filter paper with a 60° angle. |
| Hario V60-02 | No. 2 / V02 | 2-4 cups (300-600ml) | Industry standard No. 2, height approximately 102mm |
| Melitta 1×2 / AF-M | No. 2 | 2-4 cups | Fan-shaped (flat-bottomed) structure, edges need to be folded. |
| Clever Dripper (S) | No. 2 | 1-2 cups | The small size of the Smart Cup needs to fit the bottom diameter perfectly. |
| Chemix (6/8/10 Cup) | Special paper | 6-10 cup | Note: Chemex requires special thick filter paper; No. 4 is only an emergency alternative. |
Moccamaster Cup-One: Strictly matches No. 2.
Zojirushi 5-Cup: Home machines with 5 or fewer cups.
Ninja Specialty (Small Basket): Single cup or travel mug mode only.
Suitable for mainstream medium to large-sized machines using No. 4 filter paper:
Moccamaster KB/KBG/KBT: All 1.25L models come standard with No. 4.
Bonavita 5/8 Cup: Fan-shaped flat-bottom design, requires No. 4 to cover the high water level.
Breville Precision Brewer: Matches No. 4 when using a conical filter insert.
Cuisinart 10-14 Cup Models: Standard for large-capacity commercial/home machines.
- Technical Specifications: Physical Differences Between No. 2 and No. 4
| Specifications | No. 2 (Standard) | No. 4 (Standard) |
| Height | Approximately 10.2 cm | 约 12.7 cm |
| Width | Approximately 16.0 cm | 约 19.0 cm |
| Maximum powder capacity | 30g – 45g | 50g – 75g |
| Applicable brewing volume | V  600ml | 600ml < V 1200ml |
For user convenience, the following is a comparison of specifications for standardized Deer Coffee Filter production:
Deer Coffee Filter Professional Recommendation: If you are unsure of the dimensions, please measure the vertical height of the side wall of your filter cup. If the height is less than 11cm, choose No. 2; if the height is between 12-15cm, be sure to choose No. 4.
- Frequently Asked Questions (FAQ)
Q: Can I use the No. 2 filter paper in a No. 4 machine?
A: It’s not recommended. Because the No. 2 filter paper is not tall enough, when the automatic coffee machine pours water quickly, the water level will easily cover the edge of the filter paper, causing coffee grounds to flow directly into the coffee pot.
Q: What if the No. 4 filter paper is too big?
A: You can fold it an extra 1-2cm along the side and bottom creases to fit a smaller filter cup, but this will increase the thickness of the filter paper in some areas, which may cause uneven side flow.
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