Ten of thirty days
Input
¥30,000 / 10 days / 30-day basis
Output
¥10,000
Prorated Amount Calculator
Enter the monthly amount and the day-count rule used by the agreement.
Calculators
Loading tool
What it helps with
- Estimate a partial-month fee
- Check a subscription adjustment
- Compare 30-day and calendar-day rules
How to use
- Enter the monthly amount.
- Enter used days and the total-day denominator from the agreement.
- Choose rounding and copy the breakdown.
Examples
Good to know
- Contracts, rent, utilities, payroll, and subscriptions can use different day-count and rounding rules; confirm the applicable rule.
FAQ
- Should I use 30, 31, or the actual month length?
- Use the denominator stated in the relevant contract, policy, or service terms.
- Does this decide the legally correct amount?
- No. It applies the arithmetic rule you enter and does not interpret agreements or law.