Okaikei: Shopping Calculator

Make everyday price checks quick and clear with Okaikei.

Calculate a sale price from the original price and discount rate. Add a second discount when a store applies another percentage at checkout, or fine-tune the rate with the slider.

Work out tax-inclusive prices using regional presets or rates you save yourself. Choose round half up or round down to match the calculation you need.

Compare two or three products by price and amount. Okaikei shows the cost per 100 g, per 100 ml, or per item and highlights the lowest unit price.

Key features:

- Discount and extra-discount calculations
- Tax-inclusive price calculations with editable presets
- Regional default tax presets
- Unit-price comparison for up to three products
- Localized currency display
- No account or sign-in required

Tax rates and rounding rules vary by location and can change. Check current official information when accuracy is important.