Since you may have happened upon this loan calculator to calculate a monthly payment, I'll cut to the chase. You'll only need to enter three numbers, and you can leave the other dozen or so options untouched.

Here's all you need to do.

  • Click clear and enter values for:
    • Loan Amount
    • Number of Payments
    • Annual Interest Rate
  • Leave Loan Payment Amount set to 0.
  • Click either "Calc" or "Payment Schedule."

There you have it. Now you have what you need.



  Original Size  

Click, copy, paste this URL to save the inputs for yourself or to share with others.

This custom URL updates when you click the "Calc", "Clear" or "Schedule" buttons. Paste it into a browser's address bar to reload.

About Dates & Calculations

VERY IMPORTANT - You must enter a 0 if you want a value calculated. Some users have been frustrated by this. They want to know why the calculator does not just recalculate a payment if they have changed the loan amount, interest rate, or term.

This is because we want the calculator to be able to create an amortization schedule using whatever parameters you want to use. This behavior is a feature! After all, there is no such thing as a "correct" loan payment. The payment amount is correct as long as both the lender and debtor agree to it!

About the loan origination date (start date) and first payment due date - This calculator now allows irregular length first periods. That is, the calculator calculates the exact amount of interest due even when the initial period is shorter or longer than the other scheduled periods. This will result in payment amounts as well as interest charges that do not match other calculators. If you want to match other calculators then set the "Loan Date" and "1st Payment Date" so that the time between them equals one full period as set in "Payment Frequency". Example: If the "Loan Date" is May 15th and the "Payment Frequency" is "Monthly," then the "1st Payment Date" should be set to June 15th, that is IF you want a conventional interest calculation. See amortization with dates — first period interest & year-end totals for details about the long and short period interest options.

Of course, you can always leave the dates set as they are when the calculator loads.

Much More Than a Payment Calculator


Since the calculator will solve for multiple unknowns, it can easily be used to answer the following questions:

  • How much can I borrow?
  • What would my payment be?
  • What is the lending rate?
  • How long will it take to pay off my loan?
  • What date is my loan paid off?
  • What is the impact of making extra payments?
lump sum payment
Loan calculator showing lump sum payment made.
See the payment schedule for total interest saved.

Loan Calculator with Extra Payments or Lump Sum Payment

If, for example, your loan payment is $550 a month, but you could afford to pay more, say $625 a month, you could go ahead and pay the lender $625.

Why would you want to do that`?

If you made an additional payment each month, you would be prepaying principal - frequently called making extra payments (though there is nothing "extra" about it because the debtor owes the money). When a borrower prepays loan principal, they save interest charges. Loan interest gets calculated each period on the unpaid balance. The extra payment lowers the balance as of the next interest calculation and for all future interest calculations. The result is, you'll potentially save a lot in interest charges because the interest due gets calculated on a lower balance.

How much interest can I save?

That's what this calculator will tell you.

On the options tab, enter an "Extra Payment Amount."

With this calculator, the extra payments can start on any date and be for any frequency. Perhaps you pay the loan monthly, and you receive regular income that is paid to you quarterly (a stock dividend for example) that you want to use for prepaying principal. The calculator gives you the ability to enter extra payments on a schedule that suits you.

Perhaps you anticipate getting a year-end bonus. The loan calculator will calculate the impact of making a single lump sum extra payment. Just pick a payment date and enter 1 for "number of Extra Pmts."

You'll save even more in interest charges if you make multiple extra payments. You can enter a specific number or if you enter "Unknown" for the "number of extra pmts", the calculator will create a payment schedule, adding the extra payment amount as indicated until the loan is paid-in-full.

Another detail about additional payments. Notice if you make the extra payments on a date other than the scheduled periodic payment date, the layout of the amortization schedule changes. You'll see a few new columns. When making an extra payment, the borrower will want the entire amount used to reduce the principal balance. That is what this calculator will do. The additional columns make this clear by tracking the accrued interest in the interest balance column, and the calculator reduces the principal balance by the extra payment amount. The lender collects the accured interest with the next scheduled payment.

If you are a borrower, you can use this calculator to confirm that the lender is allocating the payments in this manner. I believe this is the only free loan calculator with extra payment support on the web that either allow an extra payment on a different date than the regular loan payment schedule or that correctly applies the prepayment 100% to the principal balance.

Save interest charges
Amortization schedule shows the interest saved.
loan calculator with amortization schedule showing extra payments
Loan calculator with amortization schedule showing extra payments made.
$100 prepaid principal reduces principal balance by same amount.

Wrapping Up

On a more general note, we have been discussing details about loans, some structured with unusual features, over several decades. At this point, we believe our software calculators can create a schedule for any structured settlement loan that exists. If you have a loan with special requirements, please ask.


230 Comments on “Loan Calculator”

financial online calculator Join the conversation. Tell me what you think.
  • Monte Friedman says:


    That should have been,

    “Even though the Total Dollars Paid over a 365.25 Day (1 Year) Period are the same.”

    • Hi Monte, have you tried the calculator? It will calculate this for you and you should be able to compare the schedules.

      That’s a great thing about calculators — they can be used as a teaching tool.

  • John Dmochowski says:

    We have a small corporation and the stockholders make loans to the company. I would like a program that is on a computer that calculates monthly balances, instead of our paper and pencil method. Does this financial calculator do that?

    • I don’t think this is the calculator you’ll want to use. It will calculate a loan balance after a scheduled payment (see the calculator’s amortization schedule), but it assumes the payments are made as scheduled.

      I recommend looking at the loan payoff calculator on this site. It’s designed to calculate payments on the actual date paid. Check it out. If you have any questions, just ask.

  • Steven Peters says:

    I am confused, I have a loan in which the payor makes monthly payments and sporadic and variable amounts of principal payments. I used to use one of your calculators for this. It had a screen in which I could input the date and amount of principal payments and it would recalculate the loan and amortization schedule. Cannot find the calculator, have you discontinued it?

  • Steven Peters says:

    Thanks, preferred your version that allowed you to enter extra principal payments on a separate page with date and amounts. Thanks again.

    • Hi Steven, the recommended calculator allow you to enter extra payments. I assume you saw that. However, I don’t recall ever having a calculator where the extra payments were shown on a separate page. No calculator has been dropped from this site either. So perhaps the calculator you are thinking of was on another website?

  • Hi Karl,

    Thanks for your plugin. This is awesome !
    How i can download lastest Loan Calc Plugin ? WordPress version is 1.3
    And how i can change Currency decimal ? For example, to display $32,500 instead of $32,500.00

    Thanks again.

  • Angel Mortenson says:

    Hi Karl,
    How do I calculate a land sales contract with the following?
    30 year amortization, 5 year balloon, 6% interest, loan amt $245,000, monthly pmt of $1000.00 which started on 12/01/2017 and one additional pmt of $5000.00 on 03/2019 ???
    I have tried several ways without any success…


    • First, a couple of things. Since you are stating the payment amount ($1,000) 30 year amortization is not relevant to this calculation.

      Secondly, the $1,000 a month does not cover the interest due on a $245,000 loan @ 6% – so you have what is known as negative amortization. That is, the balance, rather than being paid down is growing.

      Those things aside, you can set the calculator as follows and get an accurate amortization schedule.

      Loan Amount?:           $245,000.00
      Number of Payments? (#):         60
      Annual Interest Rate?:      6.0000%
      Payment Amount?:          $1,000.00

      Options tab:

      Loan Date?:              12/01/2017
      First Payment Due?:      01/01/2018
      Extra Payment Amount?:    $5,000.00
      Extra Payments Start?:   03/01/2019
      Extra Payment Frequency?:   Monthly
      Number of Extra Pmts? (#):        1
  • Susan Laderoute says:

    I am trying to find a schedule that I can input two payment amounts but I don’t have the interest rate only the payment amounts and the loan amount. I tried the loan calculator but it doesn’t allow for multiple payments (unless I am missing something).

    • I think I understand. You want to solve for an unknown interest rate, and (this is what I’m not so sure about) there are only 2 payments and they are for different amounts, or there are two series of payments, and each series if for a different amount?

      Either way, there is a calculator on this site that will solve for the rate for you when there are different payment amount. Please try the Ultimate Financial Calculator. Scroll down the page for tutorials. You can have 2 series of payments, each series for different amounts.

      • Susan Laderoute says:

        Thanks Karl. The first payment amount is for 6 periods and then the 2nd payment amount is for 53 periods. I have tried that one and have entered the loan and the different payments but it won’t let me not put a value in the interest rate

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