Installment Payoff Calculator — Last Payment Month, Amount Left, Days to Go
See when a payment plan ends, how much you have paid so far and how much is left — in one place.
How it works
- The plan is treated as the same payment every month for the number of months you enter, starting with the first payment month. The last payment month is "first payment month + number of months − 1": a 12-month plan that starts in March ends in February of the next year.
- The months already paid are the number of months that have passed since the first payment month: 0 in the first payment month, 1 the month after. A month only counts as paid once that month's payment is done.
- Remaining amount = monthly payment × (total months − months paid).
- D-day is the number of days until the last day of the last payment month. From the next day the result switches to "paid off".
Worked examples
| Plan | Terms | Last payment month | Total paid |
|---|---|---|---|
| Laptop, 12 months | Starts March 2026 · $99.99 a month | February 2027 | $1,199.88 |
| Phone, 24 months | Starts November 2025 · $37.50 a month | October 2027 | $900.00 |
| Appliance, 6 months | Starts September 2026 · $65.25 a month | February 2027 | $391.50 |
| Furniture, 3 months | Starts November 2026 · $150.00 a month | January 2027 | $450.00 |
The values in the table come from the same function as the calculator on this page. The amount paid so far, the amount remaining and the D-day depend on today's date, so check them in the calculator.
What is easy to miss with payment plans
- Check whether there is a financing charge. Unless it is an interest-free plan, the lender adds a charge every month. In that case enter the monthly amount billed on your statement (principal plus charge) so the result matches what you actually pay.
- The first billing month can differ from the purchase month. Depending on the billing cycle and the statement date, the first payment can show up one or two months later. Enter the month the first payment appears on your statement.
- Overlapping plans raise your monthly burden. Knowing when each plan ends tells you when the money you can spend each month grows.
- Paying off early is usually possible. Most lenders let you pay the remaining balance in one go. With a plan that charges interest or fees, the earlier you pay it off, the more of the remaining charges you save.
When to use it
Use it when you are not sure when a payment plan on a phone, laptop or appliance ends, or when you want to see in one place how much you have paid and how much is left. Knowing the last payment month and the amount remaining makes it easier to decide when you can afford the next big purchase.
Frequently asked questions
Does it include financing charges?
No. It assumes you pay the same amount every month and calculates the period and amounts from that. For a plan with charges, enter the monthly amount on your statement to get close to the real figures.
In the first payment month, "months paid" shows 0.
A month only counts as paid once that month's payment is done. It changes to 1 when the next month starts.
What does the D-day count to?
The last day of the last payment month. It counts the days left until then, and from the next day the result shows "paid off".
Is what I enter saved?
No. The calculation happens only in your browser; nothing is sent to a server or stored.
More free tools
Add it to your home screen and it opens like an app — after the first visit it works offline too. What you type never leaves your device.