Rent Proration Calculator

Enter the monthly rent and the move-in or move-out date. You'll see the partial-month rent using the two common methods side by side, so you can pick one and apply it consistently.

Common questions

How is prorated rent calculated?

Divide the monthly rent by a number of days to get a daily rate, then multiply by the days the tenant has the unit. The two common daily rates are rent ÷ days in that month, or (rent × 12) ÷ 365.

Which proration method should I use?

Either is common. What matters most is that both parties agree and the method is written down, ideally in the lease or a signed note, and used consistently.

Does the move-in day count?

In this calculator, yes. A move-in date is counted as the first day of possession, and a move-out date is counted as the last day of possession.

Does Ontario law set a proration formula?

The Residential Tenancies Act doesn't prescribe a single proration formula for a partial first month. Agree on the amount in writing. This tool gives arithmetic only, not legal advice.

Is anything I type saved?

No. The calculation runs in your browser.