Tax Calculator
Add or remove tax at any rate, with a breakdown of the net price, tax amount and total.
| Net (before tax) | 1,000.00 |
|---|---|
| Tax amount | 100.00 |
| Gross (with tax) | 1,100.00 |
Amounts are calculated with exact decimal arithmetic and rounded half-up to 2 decimal places for display.
How to use
Enter an amount, choose a tax rate (10%, 8%, or a custom rate), and pick a mode. The formulas are:
Add tax (net → gross): tax = net × rate ÷ 100, and gross = net + tax. Example: a net price of 1,000 at 10% gives tax of 100 and a gross of 1,100.
Remove tax (gross → net): net = gross ÷ (1 + rate ÷ 100), and tax = gross − net. Example: a gross of 1,100 at 10% gives a net of 1,000 and tax of 100.
Notes
Amounts are computed with exact decimal arithmetic and rounded half-up to 2 decimal places for display. Official tax rounding rules (for example, Japan's consumption tax is commonly truncated per invoice) can differ by a small amount. This tool is a calculator, not tax advice. All calculations run in your browser.
FAQ
When do I use 8% and when 10%?
In Japan the standard consumption tax rate is 10%, and the reduced rate of 8% applies to items such as food and beverages. Which applies depends on what is being purchased.
To remove 10% tax, can I just multiply by 0.9?
No. The correct calculation is gross ÷ 1.1. Multiplying by 0.9 is a 10% discount, which gives a different result.