Unit Price Compare
Which is the better deal? Instant unit price comparison
どっちがお得？計算
値段と容量を入れるだけ。単価でどっちが安いか一瞬で比較します
比較結果
「どっちがお得？」迷ったときの判断早見表
| よくある場面 | 判断のポイント |
|---|---|
| 詰め替え vs 本体 | 単価では詰め替えが安いことが多いが、特売の本体ボトルが逆転するケースもある。ml単価を計算して確認するのが確実 |
| 大容量 vs 通常サイズ | 「大きいほどお得」とは限らない。単価が高い大容量パックも実在する。使い切れず捨てる分が出るなら小さいサイズが得 |
| ポイント10倍 vs 10%引き | 同じ価格なら10%引きが得。ポイントは次回の買い物で使う前提のため、実質還元率は約9.1%にとどまる |
| 通販＋送料 vs 店頭 | 送料を含めた総額を容量で割って比較する。本ツールの「送料」欄に入力すれば実質単価を自動計算できる |
| まとめ買い vs 単品 | 単価の安さだけでなく、消費期限内に使い切れるか・保管場所があるかも考慮。食品は「期限内に使い切れる量」が上限 |
※ ポイント還元は次回の買い物で使える前提のため、その場の値引きよりわずかに価値が下がります。迷ったら値引きを選ぶのが基本です。
Quick Guide: Which Is the Better Deal?
| Common Situation | How to Decide |
|---|---|
| Refill vs Bottle | Refills usually win on unit price, but a discounted bottle can flip the result. Calculate the per-ml price to be sure |
| Bulk vs Regular Size | Bigger is not always cheaper — some bulk packs have a higher unit price. If you end up throwing part away, the smaller size wins |
| 10x Points vs 10% Off | At the same price, 10% off is better. Points are only usable on your next purchase, so the real return is about 9.1% |
| Online + Shipping vs In-Store | Divide the total including shipping by the quantity. Enter shipping in this tool to get the effective unit price automatically |
| Bulk Buying vs Single Item | Consider expiration dates and storage space, not just unit price. For food, the limit is what you can use before it expires |
* Point rewards can only be used on a future purchase, so they are worth slightly less than an immediate discount. When in doubt, choose the discount.
About Unit Price Compare
About the Unit Price Compare Tool
The Unit Price Compare tool helps you find the most cost-effective product by comparing items of different sizes and quantities on a per-unit basis. Make smarter, more economical shopping decisions every day at supermarkets, drugstores, and convenience stores.
Why Unit Price Comparison Matters
In everyday shopping, the same product often comes in various sizes at different prices. The assumption that "larger packages are always cheaper" is misleading. Calculating the actual unit price sometimes reveals that smaller packages offer better value. For example, 500ml at $1.50 costs $0.30 per ml, while 1.5L at $4.00 costs approximately $0.267 per ml. Numbers reveal the true best deal.
Simple and Intuitive Usage
Enter the price and quantity—the tool automatically calculates the price per unit (product name is optional). Compare multiple products simultaneously for hassle-free decision-making. Pick a unit per product (ml, L, g, kg, mg, pieces, sheets, items, cm, m) or enter custom units for flexibility. Mixed units such as 900ml vs 1.5L are converted automatically, and unit prices are also shown shelf-tag style per 100ml or 100g.
Effective Unit Price with Pack Count, Shipping, and Points
The displayed price alone does not tell you which is the better deal. With the advanced options, you can enter pack count (e.g., 200 sheets × 30 packs), shipping cost for online orders, and point reward percentage — the tool reflects all of them in the effective unit price. It answers comparisons that simple calculators cannot, such as "10x points or 10% off?" and "is online with shipping still cheaper than in-store?"
Visual Clarity at a Glance
Bar graphs make unit price differences immediately clear and intuitive. The cheapest option is highlighted in green, so you can see rankings visually rather than scanning numbers. Savings are displayed in both absolute cost and percentage, making it easy to understand your actual savings and make confident purchasing decisions.
Complete Privacy and Security
All calculations run entirely in your browser—no data is ever sent to external servers. Your personal information remains completely private with no communication or log records. Use it anywhere: supermarkets, drugstores, online shops. Make smarter purchasing decisions every time."
How to use Unit Price Compare
- Enter the price and quantity for Product 1 and Product 2 (name is optional)
- Pick a unit per product (ml, L, g, kg, pieces, sheets, etc.). Mixed units like 900ml vs 1.5L are converted automatically; choose '...' for custom units
- The tool instantly calculates unit prices—which is cheaper is obvious at a glance with visual bar graphs
- Click 'Add Product' to compare up to 5 products at once; the cheapest is highlighted in green
- Check 'Include pack count, shipping & point rewards' to compare by effective unit price with multipliers, shipping, and reward percentages
- View the savings difference in both absolute cost and percentage to understand your actual savings
Benefits of Unit Price Compare
- Automatic unit conversion between ml/L, g/kg, and mg/g — compare 900ml vs 1.5L directly without mental math
- Shelf-tag style per-100ml / per-100g display makes it easy to check against store price labels
- Preset units (ml, L, g, kg, mg, pieces, sheets, items, cm, m) for quick selection—supports pharmaceuticals, household items, and food products
- Compare up to 5 products simultaneously and instantly identify the best value with results consolidated on a single screen
- Effective unit price comparison with pack count, shipping, and point rewards — answers questions like '10x points or 10% off?'
- Visual bar graphs reveal unit price differences at a glance; savings shown in both absolute cost and percentage for clarity
- Runs entirely in your browser with no data transmission—complete privacy and no concerns about server communication
- Mobile-optimized display lets you identify the best deal on the spot while shopping at supermarkets or drugstores
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