How Japan Supermarket Price per 100g Labels Work

A tray of meat or fish in Japan can show several prominent yen figures. One is often a comparison price for 100 grams, not the amount charged for that tray. Find 100g当り, net weight and the tax-inclusive total in that order, then compare packs on equal terms.

Separate the unit price from the tray total

100g当り or 100gあたり means price per 100 grams, about 3.5 ounces. 内容量 or 正味量 is net weight. 販売価格, or another yen amount tied to the individual label, is the tray price. At ¥298 per 100g, a 347g tray works out to 298 × 347 ÷ 100, or roughly ¥1,034 before tax if the unit price is tax-exclusive. When the label already prints a tray total, use the formula only as a check.

Unit price is useful when pack sizes differ. A 250g tray at ¥800 costs ¥320 per 100g, while a 400g tray at ¥1,120 costs ¥280 per 100g. The larger tray offers the lower unit price but is not automatically the better travel purchase. Choose the amount you can cook, refrigerate and finish rather than buying waste for a nominal saving.

Net weight excludes the tray and wrapping

Japan's Measurement Act applies quantity and permitted-error rules to specified goods commonly sold by weight. Packaging such as the tray, film, absorbent pad and separate sauce is generally 風袋, or tare, and is not part of net contents. A 347g label therefore describes the food sold, not everything you feel when holding the sealed tray. Bones and shells that form part of the food are treated differently from packaging.

Store-packed fresh food varies from tray to tray. Two labels can carry the same product name and the same 100g rate while showing different totals because one tray is heavier. Read the sticker on the exact item in your hand, not a nearby tray or a representative shelf figure. For online weighted goods, a displayed pack price may also be an estimate that changes to match the item actually selected.

Find the tax-inclusive amount before comparing budgets

A Japanese label may make 本体価格 or 税抜, the before-tax figure, more prominent. Takeaway food generally uses the 8% consumption-tax rate, so a ¥1,034 before-tax tray is roughly ¥1,117 after tax. Readers from the UK, Ireland, Australia, New Zealand and Singapore are used to VAT or GST already being in shelf prices and should look carefully for 税込. US and Canadian readers already expect tax at the register, but should still use the printed Japanese total rather than assume a local sales-tax method.

Japan requires a tax-inclusive total when a business displays a consumer price in advance, but it may show a before-tax amount beside it. Yen rounding can make a hand calculation differ slightly from the register. If a markdown sticker is attached, identify the original tray total first and verify the discounted, tax-inclusive charge on the receipt.

Use the item label and receipt as the final check

Read the product name, unit price, net weight, tray total and 税込 line on the same sticker. If your arithmetic is far off, check whether the unit rate excludes tax, whether a discount has been applied and whether you accidentally read the next tray's label. After checkout, compare the receipt line with the package before leaving the store.

Ikura Cart can help identify a Japanese product and organise a yen basket while you compare packages. Treat a scan as assistance, not the store's price record: the sticker on the item and the receipt control the sale. This article was reviewed on October 28, 2026 against Japan's economy ministry, tax agency, local measurement authorities and retailer guidance.