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消費税・売上税計算機

価格に税率を加え、税額と税込価格を表示します。

ツールを読み込み中…

このツールはブラウザ内で動作します。入力内容、ファイル、生成した値はこの端末に残ります。お気に入りと最近使ったツールを利用する場合も、ローカルストレージに保存されるのはツール名だけで、パスワード、文書、QR コードの内容は保存されません。 詳しくはプライバシーポリシーをご覧ください。

このツールの詳しい解説（使い方、例、よくある質問）は、現在英語のみでご用意しています。

What this tool does

Add a sales tax rate to a price. You get the tax amount and the price after tax. The labels stay the same for any currency.

How to use

  1. Enter the original price. It must be zero or greater.
  2. Enter the sales tax percentage. A rate of 0 is valid. A negative rate is not.
  3. Press Calculate.
  4. Copy the tax amount and the final price if you need them elsewhere.

Examples

  • An 8% rate on 49.99

    Tax amount is 4.00 after rounding to cents. Final price is 53.99.

  • A tax-free item

    Price 20, rate 0%. Tax amount is 0 and the final price stays 20.

Main features

  • Tax amount and final price, rounded to two decimal places.
  • No currency symbol, so you can use the numbers with any unit.
  • A rate above 100% is allowed, because some stacked taxes work that way.

How it works

Tax amount is the original price times the rate divided by 100. Final price is the original price plus that tax. Rounding happens at two decimal places, which matches typical cash amounts but can differ by a cent from a register that rounds each line differently.

Tips

  • If the price you have is already tax-inclusive, this tool will add tax again. Start from the pre-tax price.
  • For a discount and then tax, run the discount calculator first and use that result as the original price.

Limitations

This does not look up a city, state, or country rate. You supply the percentage. It also does not split tax across several items.

See the disclaimer for what these tools do not cover.

FAQ

Why is there no dollar sign?
The same math applies to any currency. Adding a symbol would be wrong for many readers.
Can the rate be 0?
Yes. The tax amount is 0 and the final price equals the original price.
Is my input sent to a server?
No. The price and tax rate are calculated in this tab. They are not sent to a server.
How do I calculate sales tax?
Multiply the price by the tax rate and divide by 100, then add the result to the price. $50 at 8% is $4 tax, so the total is $54.
How do I find the price before tax?
Divide the total by 1 plus the rate as a decimal. A $54 total at 8% tax is 54 ÷ 1.08 = $50 before tax.

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