Japan Post Postage Calculator — Stamp & Shipping Cost
郵便料金計算ツール — Calculate mailing costs instantly
Enter the weight and mail type to calculate Japan Post shipping costs.
Covers standard, non-standard (within/outside size), and express delivery.
Uses the latest rates from the October 2024 revision. Free, no login required.
Quick Reference Table (Oct 2024 Rates)
| Weight | Standard | Within Size | Outside Size | Letterpack L | Letterpack+ |
| 25g | ¥110 | ¥140 | ¥260 | ¥430 | ¥600 |
| 50g | ¥110 | ¥140 | ¥260 | ¥430 | ¥600 |
| 100g | — | ¥180 | ¥290 | ¥430 | ¥600 |
| 250g | — | ¥320 | ¥450 | ¥430 | ¥600 |
| 500g | — | ¥510 | ¥660 | ¥430 | ¥600 |
| 1kg | — | ¥750 | ¥920 | ¥430 | ¥600 |
Flat-Rate Products
Letterpack Light
¥430
A4 / up to 4kg / mailbox delivery / tracking
Letterpack Plus
¥600
A4 / up to 4kg / in-person / tracking
Smart Letter
¥180
A5 / up to 1kg / max 2cm thick
Click Post
¥185
34×25×3cm / up to 1kg / tracking
Understanding Japan Post Rates — October 2024 Changes
On October 1, 2024, Japan Post implemented its first major rate revision in approximately 30 years. The most notable change affects standard mail: both the up-to-25g tier (previously ¥84) and the up-to-50g tier (previously ¥94) were unified at ¥110. Postcards also rose from ¥63 to ¥85. Non-standard mail saw increases of ¥10 to ¥50 across all weight brackets for both within-size and outside-size categories.
The revision was driven by declining mail volumes and rising labor and fuel costs. Notably, flat-rate products such as Letterpack Light (¥430), Letterpack Plus (¥600), and Click Post (¥185) remained unchanged, making them even more cost-effective relative to weight-based options. This calculator uses the post-revision rates for all calculations.
Choosing the Right Mailing Option
For one or two sheets of paper, standard mail at ¥110 is the cheapest option. A4 documents or thin items fit well in non-standard within-size mail, costing just ¥140 for up to 50g. For thicker parcels or marketplace shipping, Letterpack Light (¥430) and Click Post (¥185) offer tracking at a flat rate. If speed matters, the express surcharge adds ¥290 for items up to 250g or ¥390 for heavier items.
Keep in mind that exceeding weight or size limits will result in rejection at the counter. Standard mail is capped at 23.5×12×1cm and 50g; within-size non-standard allows up to 34×25×3cm and 1kg. Letterpack Plus has no thickness limit, making it ideal for bulky items like clothing or plush toys. Always weigh and measure your item before choosing a mailing method.
Frequently Asked Questions
What is the difference between standard and non-standard mail?
Standard mail (定形) is limited to 23.5×12×1cm and 50g. Non-standard has two categories: "within size" (規格内, up to 34×25×3cm, 1kg) and "outside size" (規格外, up to 4kg).
What changed with the October 2024 price revision?
Standard mail was unified at ¥110 for both ≤25g and ≤50g (previously ¥84/¥94). All non-standard categories also increased. This tool uses the revised rates.
What is the difference between Letterpack Light and Plus?
Letterpack Light (¥430) is delivered to your mailbox. Letterpack Plus (¥600) requires in-person signature. Both are flat-rate nationwide with tracking, up to 4kg. Plus has no thickness limit.
How is express (速達) surcharge calculated?
Add ¥290 for items ≤250g or ¥390 for items over 250g to the base postage. This tool calculates it automatically when you check the express option.
What is Click Post?
Click Post (¥185) lets you pay online, print a label at home, and drop it in a mailbox. Covers items up to 34×25×3cm, 1kg with tracking.