Loan Affordability
Calculate Loan Affordability instantly with the exact formula and a worked example.
Loan Affordability
Monthly income$
Maximum debt-to-income ratio%
Existing loan payments per month$
Annual interest rate%
Loan termyears
Maximum loan amount
1,181,408$
Maximum payment
30000$
Total interest
618592$
More about: Loan Affordability
What it calculates
The “Loan Affordability” calculator computes Maximum loan amount in $ from 5 parameters: monthly income ($), maximum debt-to-income ratio (%), existing loan payments per month ($), annual interest rate (%), loan term (years).
Useful when choosing a loan, working out the payment, estimating the total cost, and comparing options.
Example calculation
With parameters Monthly income = 100,000 $, Maximum debt-to-income ratio = 30 %, Existing loan payments per month = 0 $, Annual interest rate = 18 %, Loan term = 5 years the result is 1,181,408 $ (Recommended debt load: no more than 30–40 % of income).
How to use
- Enter monthly income, maximum debt-to-income ratio, existing loan payments per month, annual interest rate and loan term — each field above is adjustable with a slider.
- Maximum loan amount ($) 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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