Adjustable-Rate Loan
Calculate Adjustable-Rate Loan instantly with the exact formula and a worked example.
Adjustable-Rate Loan
Index (key rate, SOFR, etc.)%
Lender margin (spread)%
Current rate%
Periodic cap (max change)%
Lifetime rate cap%
Remaining balance$
Months remainingmonths
New rate
7.75%
Fully indexed rate
7.75%
Limited by cap
No
New payment
22660$
Payment change
3331$
More about: Adjustable-Rate Loan
What it calculates
The “Adjustable-Rate Loan” calculator computes New rate in % from 7 parameters: index (key rate, sofr, etc.) (%), lender margin (spread) (%), current rate (%), periodic cap (max change) (%), lifetime rate cap (%), remaining balance ($), months remaining (months).
Useful when choosing a loan, working out the payment, estimating the total cost, and comparing options.
Example calculation
With parameters Index (key rate, SOFR, etc.) = 5 %, Lender margin (spread) = 2.75 %, Current rate = 6 %, Periodic cap (max change) = 2 %, Lifetime rate cap = 11 %, Remaining balance = 3,000,000 $, Months remaining = 300 months the result is 7.75 %.
How to use
- Enter index (key rate, sofr, etc.), lender margin (spread), current rate, periodic cap (max change), lifetime rate cap, remaining balance and months remaining — each field above is adjustable with a slider.
- New rate (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is the monthly loan payment calculated?
With the amortization formula: P = S · (i · (1+i)^n) / ((1+i)^n − 1), where S is the loan amount, i is the monthly interest rate (annual rate / 12 / 100), and n is the number of months. This produces equal monthly payments over the full term.
What is APR and how does it differ from the interest rate?
APR (Annual Percentage Rate) reflects the total yearly cost of the loan including the interest rate plus most fees (origination, processing). It is usually higher than the nominal interest rate and is the most reliable number for comparing loan offers.
Can I pay off a loan early without penalty?
Most consumer loans in the US allow early payoff. A few lenders charge a prepayment penalty, so check your loan agreement. Paying extra toward principal reduces the total interest you pay over the life of the loan.
What affects the total interest I pay?
The loan amount, the interest rate, and the term. A longer term lowers the monthly payment but increases total interest. A shorter term costs more per month but far less overall.
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