Japanese Condom Sizes: Diameter, Flat Width and Length on Okamoto and Sagami Boxes
By the OOBiz product information team. Reviewed on November 8, 2026.
Size is printed differently on Japanese boxes than on many US boxes. Some brands state a nominal width, measured with the condom laid flat. The Okamoto and Sagami boxes we sell do not print a flat width. Sagami prints a diameter and a length. The Okamoto 002 boxes print a size label such as Regular or L, and no millimeter figures. This page explains the terms and lists the figures each maker gives, with the source and the date we checked it. We do not estimate or convert any figure the maker does not publish.
Three different measurements
Diameter (直径). The distance straight across the condom when it is round, in millimeters. This is the figure Sagami prints on the back of its Original 002 boxes.
Flat width, or nominal width. The width of the condom laid flat. Some brands print this figure instead. It is not printed on the Okamoto or Sagami boxes on this page.
Length (長さ). The length of the condom in millimeters. On the Sagami Original 002 boxes, the length is marked as the company's own measurement.
A diameter and a flat width are measured differently, so the two numbers should not be compared directly. Because the boxes do not give a flat width, we do not publish a converted figure.
The figures each maker gives
| Box | Size label on the box | Diameter | Length | Where the figure comes from | Checked |
|---|---|---|---|---|---|
| Sagami Original 002, Regular | Regular | 36 mm | 170 mm | Printed on the box back; also on Sagami's official shop page | November 7, 2026 |
| Sagami Original 002, L | L (Lサイズ) | 38 mm | 190 mm | Printed on the L box back, length marked as the maker's measurement; also on a Japanese retailer's product page | September 22, 2026 (box text); November 7, 2026 (retailer page) |
| Okamoto 002, Regular | Regular (back of box); Standard (front) | Not printed | Not printed | Okamoto product page and box | November 7, 2026 |
| Okamoto 002, L | L (Okamoto's product name: Lサイズ) | Not printed | Not printed | Okamoto product page and box; the box states it is larger than the regular size of the series | November 7, 2026 |
| Okamoto 002, Real Fit and Rich Lubricant | Regular (back of box) | Not printed | Not printed | Box text | September 22, 2026 |
| Okamoto 003 Hyaluronic Acid | Not stated in the sources we checked | Not printed | Not printed | Okamoto product page | November 7, 2026 |
By the maker's figures, the Sagami Original 002 L is 2 mm larger in diameter and 20 mm longer than the Regular.
Reading the size on a Japanese box
| Japanese on the box | Meaning |
|---|---|
| サイズ | Size |
| レギュラー | Regular |
| スタンダード | Standard. Okamoto uses it on the front of the Regular 002 box. On Sagami boxes, 形…スタンダード refers to the standard shape. |
| Lサイズ | Large size |
| 直径 | Diameter |
| 長さ | Length |
| 当社測定 | Measured by the company (the maker's own measurement) |
Where to find these boxes
- Sagami Original 002 Regular: box of 5, box of 10, box of 20
- Sagami Original 002 L (large): box of 10
- Okamoto 002 Regular: box of 6, box of 12
- Okamoto 002 L (large): box of 12
Multi-box packs are listed on our Okamoto and Sagami collection pages. For what the 002 and 003 numbers mean, see Okamoto 002, Okamoto 003 and Sagami Original 002: what the numbers on the box mean.
We ship from the United States. Many of our products, including condoms, may not be available for delivery outside the United States; if checkout does not offer a shipping option for your address, we cannot ship there. Processing and delivery details are on our Shipping Policy page.
Common questions
What size is Sagami Original 002?
Sagami gives the Original 002 Regular a diameter of 36 mm and a length of 170 mm. The Original 002 L has a diameter of 38 mm and a length of 190 mm. Both are the maker's own figures.
How big is Okamoto 002 L?
Okamoto does not print a diameter, length or width for Okamoto 002 L on the box or on its product page. The box states that it is larger than the regular size of the series.
Is the diameter on a Japanese box the same as nominal width?
No. Diameter is measured straight across the round condom, and nominal width is measured across the condom laid flat. The two figures are measured differently and should not be compared directly.
Why don't you list a width in millimeters for Okamoto?
Okamoto does not print one on the boxes we sell or on the product pages we checked, so we list only the size label printed on the box.
Related guides
- Okamoto and Sagami Reference Table: Material, Thickness and Size
- Sagami Original 001 vs Okamoto 001: Side by Side
- Sagami Original 001: Material, Size and Thickness
Sources
- Sagami official shop, Sagami Original 002, 5 pieces: https://www.sagami-shop.com/SHOP/MC0059.html (checked November 7, 2026)
- Japanese retailer listing for Sagami Original 002 L size, 10 pieces: https://netshop.create-sd.co.jp/shop/g/g4974234619221/ (checked November 7, 2026)
- Okamoto, ZERO-TWO Standard 12 product page: https://okamoto-condoms.net/okamoto002/okamoto002-12/ (checked November 7, 2026)
- Okamoto, ZERO-TWO L size 6 product page: https://okamoto-condoms.net/okamoto002/okamoto002-l-6/ (checked November 7, 2026)
- Okamoto, ZERO ZERO THREE Hyaluronic Acid 10 product page: https://okamoto-condoms.net/003/003-hyaluronicacid-10/ (checked November 7, 2026)
- Box text read by the OOBiz product information team from the makers' published box images (September 22, 2026)
Condoms reduce, but do not eliminate, the risk of pregnancy and sexually transmitted infections. Read and follow the package instructions. Do not use a damaged or expired product.
Brand names and trademarks belong to their respective owners. OOBiz (OOBIZ LLC), based in Syosset, New York, is an independent reseller and is not affiliated with Okamoto Industries, Inc. or Sagami Rubber Industries Co., Ltd.