Grip Seal Bag Size Chart: Millimetres, Centimetres and Inches
Grip seal bag sizes are often quoted in inches, but many UK suppliers list them in millimetres or centimetres. This chart shows all 16 of our sizes in all three, so you can compare quickly. Sizes are internal dimensions: opening width x height. Inch figures are approximate.
Grip seal bag size chart
| Millimetres | Centimetres | Inches (approx.) |
|---|---|---|
| 20 x 20mm | 2 x 2cm | 0.8 x 0.8 in |
| 25 x 25mm | 2.5 x 2.5cm | 1.0 x 1.0 in |
| 30 x 30mm | 3 x 3cm | 1.2 x 1.2 in |
| 40 x 40mm | 4 x 4cm | 1.6 x 1.6 in |
| 45 x 45mm | 4.5 x 4.5cm | 1.8 x 1.8 in |
| 50 x 50mm | 5 x 5cm | 2.0 x 2.0 in |
| 55 x 65mm | 5.5 x 6.5cm | 2.2 x 2.6 in |
| 60 x 40mm | 6 x 4cm | 2.4 x 1.6 in |
| 60 x 60mm | 6 x 6cm | 2.4 x 2.4 in |
| 60 x 90mm | 6 x 9cm | 2.4 x 3.5 in |
| 70 x 105mm | 7 x 10.5cm | 2.8 x 4.1 in |
| 80 x 120mm | 8 x 12cm | 3.1 x 4.7 in |
| 100 x 100mm | 10 x 10cm | 3.9 x 3.9 in |
| 125 x 125mm | 12.5 x 12.5cm | 4.9 x 4.9 in |
| 150 x 150mm | 15 x 15cm | 5.9 x 5.9 in |
| 200 x 100mm | 20 x 10cm | 7.9 x 3.9 in |
How to convert millimetres to inches
Divide the size in millimetres by 25.4. For example, 100mm is about 3.9 inches. To go the other way, multiply inches by 25.4. For centimetres, multiply by 10 to get millimetres first.
Looking for an inch size? Nearest matches
If you are used to buying bags in inches, here is the closest size in our range:
| If you want about... | Closest size |
|---|---|
| 1 x 1 inch | 25 x 25mm |
| 2 x 2 inch | 50 x 50mm |
| 2.5 x 2.5 inch | 60 x 60mm |
| 2 x 3 inch | 60 x 90mm |
| 3 x 4 inch | 70 x 105mm |
| 3 x 5 inch | 80 x 120mm |
| 4 x 4 inch | 100 x 100mm |
| 5 x 5 inch | 125 x 125mm |
| 6 x 6 inch | 150 x 150mm |
| 4 x 8 inch | 200 x 100mm |
These are close but not exact, so check your item's measurements before ordering. A slightly larger bag is better than a tight fit.
Metric and imperial in the same measurement
- 10mm = 1cm = about 0.39 inch
- 25.4mm = 1 inch exactly
- 100mm = 10cm = about 3.9 inches
- 150mm = 15cm = about 5.9 inches
Frequently asked questions
Are the sizes internal or external?
Internal: the usable space inside the bag, opening width x height.
Why are there no exact inch sizes?
Our bags are made to metric sizes, so inch equivalents are approximate. Use the nearest-size table above.
Which number comes first?
The first number is the width of the opening, where the grip seal strip is.
Which size do you need?
Measure the width and height of your item, then choose a bag slightly larger. Our grip seal bag size guide explains how to choose, and you can browse every size in our grip seal bags collection. Buying in bulk? See wholesale grip seal bags.