Contact

To report a mistake in a calculation, suggest a calculator, or share feedback, email hello@okanekeisan.com. English or Japanese is fine.

If you think a calculation is wrong, please include the calculator's name, the numbers you entered, the result you expected and the result you got. That makes it much faster to check.

We can't answer questions about your own tax, legal or insurance situation. For that, ask a tax accountant (zeirishi), a labour and social security attorney (shakai hoken roumushi) or your employer's payroll department. This is general information, not tax, legal, or financial advice.