Rent proration is a common practice in rental agreements that allows for the calculation of rent when a tenant moves in or out on a day other than the first or last day of the rental period. Essentially, it ensures that both the landlord and the tenant pay for only the days they occupy the property. This is particularly useful for situations like mid-month move-ins or move-outs, or when a lease term doesn't perfectly align with a full calendar month.
The core principle of rent proration is to divide the total monthly rent by the total number of days in that specific rental month. This gives you the daily rental rate. Once you have the daily rate, you can multiply it by the number of days the tenant will actually occupy the property during that partial month.
How to Calculate Prorated Rent:
Determine the Monthly Rent: This is the agreed-upon rent for a full calendar month as stated in your lease agreement.
Identify the Move-in/Move-out Date: Pinpoint the exact day the tenant takes possession of the property or vacates it.
Find the Total Days in the Month: Note the total number of days in the month for which you are prorating rent (e.g., 30 for April, 31 for May, 28 or 29 for February).
Calculate the Daily Rent Rate: Divide the monthly rent by the total number of days in that month.
Daily Rent Rate = Monthly Rent / Total Days in Month
Calculate the Prorated Rent: Multiply the daily rent rate by the number of days the tenant will occupy the property.
Prorated Rent = Daily Rent Rate * Number of Occupied Days
For example, if a tenant moves in on April 10th and the monthly rent is $1500, with April having 30 days:
Daily Rent Rate = $1500 / 30 days = $50 per day
If the tenant is staying for the entire month, they would occupy the property for 21 days (from April 10th to April 30th, inclusive).
Prorated Rent = $50/day * 21 days = $1050
This calculator simplifies the process, ensuring accuracy for both landlords and tenants in prorating rent for partial months.
function calculateProratedRent() {
var monthlyRent = parseFloat(document.getElementById("monthlyRent").value);
var moveInDate = new Date(document.getElementById("moveInDate").value);
var moveOutDate = new Date(document.getElementById("moveOutDate").value);
var totalDaysInMonth = parseInt(document.getElementById("totalDaysInMonth").value);
var resultDiv = document.getElementById("prorationResult");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(monthlyRent) || monthlyRent <= 0) {
resultDiv.innerHTML = "Please enter a valid monthly rent amount.";
return;
}
if (!moveInDate || isNaN(moveInDate.getTime())) {
resultDiv.innerHTML = "Please select a valid move-in date.";
return;
}
if (!moveOutDate || isNaN(moveOutDate.getTime())) {
resultDiv.innerHTML = "Please select a valid move-out date.";
return;
}
if (isNaN(totalDaysInMonth) || totalDaysInMonth <= 0) {
resultDiv.innerHTML = "Please enter the total number of days in the month.";
return;
}
if (moveOutDate < moveInDate) {
resultDiv.innerHTML = "Move-out date cannot be before the move-in date.";
return;
}
// Ensure moveOutDate is treated as the last day of occupancy if it's a move-out date
// For proration, we usually count the days from move-in up to and including the move-out day.
// If the move-out date is the last day of the month, we need to ensure it's counted correctly.
// The number of occupied days is calculated as (moveOutDate – moveInDate) + 1
// We need to adjust moveOutDate to be the end of the day for accurate difference calculation.
var endDate = new Date(moveOutDate);
endDate.setHours(23, 59, 59, 999);
var timeDiff = endDate.getTime() – moveInDate.getTime();
var daysOccupied = Math.ceil(timeDiff / (1000 * 3600 * 24)) + 1;
// If the move-out date is the same as the move-in date, it's still 1 day occupied.
if (daysOccupied totalDaysInMonth) {
daysOccupied = totalDaysInMonth;
}
var dailyRentRate = monthlyRent / totalDaysInMonth;
var proratedRent = dailyRentRate * daysOccupied;
resultDiv.innerHTML = "Daily Rent Rate: $" + dailyRentRate.toFixed(2) + "";
resultDiv.innerHTML += "Number of Days Occupied: " + daysOccupied + "";
resultDiv.innerHTML += "Prorated Rent Due: $" + proratedRent.toFixed(2) + "";
}