365/360 Loan Calculator

How the 365/360 Loan Calculator Builds a 365/360 Schedule

Commercial banking relies on the 365/360 daily interest calculation method on most commercial loan products and a good deal of business lending. The bank divides your annual rate by 360 to get a daily rate, then multiplies it by the actual number of days in the billing period. Because a real year has 365 days, you pay 365 days of daily interest at a rate built for 360, which lifts the true yearly cost above the stated rate. The free deferred payment loan calculator is free to use with no sign-up, and works on desktop and mobile.

The interest for any single period follows this formula:

Your effective annual rate works out to the stated rate multiplied by 365/360, which is a factor of about 1.0139. A stated 6.85% therefore behaves like 6.945% over a full year.

Daily Interest and the Number of Days in Each Month

Because interest follows the calendar, a 31-day month costs more than a 30-day month even when the outstanding balance is nearly identical. On a $412,600 balance at 6.85%, 31 days of daily interest is $2,433.77, while a hypothetical 28-day month would be $2,198.24. Under a plain 30/360 convention every month would be $2,355.26, so the actual-day method swings both above and below that line before the extra days tip the yearly total higher.

Amortization Term Versus Loan Term

Two lengths matter on this kind of note. The amortization term is the number of payments used to size your payment, while the loan term is how long the loan actually runs before the bank expects it to be paid or refinanced. When both are equal, you have a fully amortized note; when the loan term is shorter, the unpaid remainder is due as a balloon payment on the final payment date.

Loan Calculator Inputs and Calculated Values

This loan amortization calculator asks for the same handful of inputs a bank uses to set up a note. Change any value and the calculated values update immediately; choose view report to open the full report with every row of the schedule. Next, open the composition of loan payments calculator and enter your own details to see an estimate in seconds.

• Amount of loan: the principal you borrow on the financing start date.
• Interest rate: the stated annual rate before the 365/360 adjustment.
• Loan term and amortization term: the number of payments the note runs and the number used to size each payment.
• Payment frequency: monthly, quarterly, semi-annual or annual payments.
• Loan type: installment loan, balloon, interest only, or fixed principal plus accrued interest.
• First payment date: usually the first day of the month after one full period has passed.

In return you get your monthly payment, total interest paid, total payments, and the date of the last installment.

Loan Type and Payment Frequency

An installment loan repays principal and interest evenly across the amortization term. A balloon loan keeps the same payment but ends sooner, leaving a lump sum, and an interest only structure charges only the accrued interest for a set number of periods. The payment frequency can be monthly, quarterly, or annual; weekly and biweekly schedules appear on some products too. When you pay less often than monthly, interest keeps accruing every month and rolls into your balance until the next payment arrives.

Financing Start Date and First Payment Date

Interest begins on the financing start date, normally the day funds reach you. The period before your first payment date is not part of the loan term, but interest still has to accrue during it, so a start date of March 1 and a first payment on April 1 gives you a 31-day opening period. Setting the final payment date follows from the term you choose.

Worked Example: Commercial Loan Amortization Calculator Results

Suppose you borrow $412,600 at 6.85% on a 15-year, fully amortizing note that funds on March 1, 2027, with payments on the first of each month starting April 1, 2027. The payment is sized with the standard level-payment formula at 6.85% divided by 12 over 180 months:

That gives a monthly payment of $3,674.05, so you budget for twelve level monthly payments each year. The first four rows of the payment schedule show how the calendar shapes each month's split:

Over the full term you make $668,861.32 in total payments, and total interest paid is $256,261.32. The same loan under a 30/360 convention would cost $248,729.17, so the actual-day method adds $7,532.15. That difference shows up as a larger final payment of $11,206.37 on March 1, 2042, because the level payment sized at rate/12 never quite clears the extra daily interest.

Payment and Interest Rate Effects on the Extra Cost

The surcharge grows with both the rate and the length of time your balance stays outstanding. This grid shows the extra interest, compared with the same loan on a 30/360 basis, for the $412,600 example.

Checking a Clinic's Balloon Note for 365/360 Interest

Marisol Okafor is financing $186,350 of treatment-room equipment for her physical therapy clinic. The bank's term sheet quotes 7.125%, a 10-year payment schedule, and a 5-year maturity, and it lists the balloon due at maturity as $109,550.61. That figure looks like a 30/360 estimate, and her note says interest is charged on actual days over a 360-day year, so she wants to see the real number before signing.

She enters $186,350, 7.125%, an amortization term of 120 payments and a loan term of 60, with funding on February 1, 2027 and a first payment on March 1. The calculator returns a payment of $2,175.71, which matches the term sheet. Her first period has only 28 days, so interest is $1,032.69; the next period has 31 days and costs $1,136.32. Across the five years, interest paid reaches $54,655.15, against $53,743.21 on a 30/360 basis.

The balloon is where the difference lands: $110,462.55, which is $911.94 above the term sheet. The day-count basis leaves her $26,108.52 of annual debt service untouched, so the lender's 1.25 coverage covenant is still met at 1.34 on $34,900 of net operating income. Only the amount to refinance in 2032 changes.

So she makes two moves: she asks the bank to confirm the day-count basis in writing, and she sets aside an extra $15.20 a month, which is $911.94 spread over 60 months, so the balloon reserve covers the actual figure rather than the quoted one.

365/360 Versus the 365/365 Loan Calculator and 30/360

The 365/365 loan calculator divides the rate by the real length of the year, so a stated rate and an effective rate match. A 30/360 method treats every month as 30 days and ignores the calendar altogether. Of the three, 365/360 is the costliest for you as the borrower and the most common on commercial notes, while 365/365 is the closest to an actual-day measure of what you owe. An amortization calculator built for one basis will not match a bank statement that uses another, which is why the day-count basis in your loan agreement is worth confirming before you compare quotes.

Day-Count Interest on Balloon, Interest Only, and Line of Credit Loans

Plenty of business lending departs from a simple installment loan. A balloon payment lowers the periodic payment in exchange for a lump sum at maturity, which suits short-term financing where a refinance is planned. Interest only payments cover just the accrued interest for the opening periods and then switch to principal and interest. A line of credit works differently again: you draw funds as needed and the daily interest follows your outstanding balance, so a dedicated tool for deferred payment or revolving credit is a better fit than a fixed amortizing loan calculator. Under each structure, daily interest still accrues on actual days, and the calculator's dropdown models the fixed ones.

Reading Your Amortization Schedule Report

A finished amortization schedule lists each payment's date, days, interest, principal and remaining loan balance. Early rows are interest-heavy: in the example above, only about $1,240 of the first $3,674.05 reduces principal. By the end of year five your outstanding balance is $320,868.89, and by year ten it is $191,066.99. Year-one interest is $28,239.40 against $27,756.67 under 30/360.

Check the number of days against your own calendar, confirm that the annual rate in the report matches your note, and look at the last row, since a larger final payment is normal on this basis. Treat the output as one of the self-help tools your bank provides: your loan agreement controls the exact figures.

Lowering Your Total Interest Paid on a 365/360 Note

Because interest is charged on the balance for each day, anything that shrinks the balance sooner cuts your cost. An early payoff or an extra principal payment reduces every later period's interest, and a shorter term removes years of accrual. Run a loan comparison across lenders using the effective rate rather than the stated one, confirm each lender's day-count basis, and weigh a refinance only after you add fees, in line with your financial goals.

Set against savings, investment returns or a mortgage, a $7,500 day-count surcharge is a real cost. Rerun the 365/360 interest payment schedule with an extra principal payment, or move the slider on the term, and watch it shrink; your commercial loan amortization calculator results will then line up with your lender's report.