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Lending Calculator

Work out a loan's monthly payment, total interest and true APR once origination fees are included, or switch modes to see the most you could borrow for your income, current debts and a lender's debt-to-income limit.

Updated November 4, 2026. Free, no sign-up; everything runs in your browser and nothing you type is stored.

Lending calculator

Mode

Loan amount ($)Interest rate (%)Term (months)Origination fee (% of loan)Other upfront fees ($)

Monthly payment

–

–APR including fees

–Total interest

–Upfront fees

–Cash you actually receive

–Total cost (payments + fees)

Gross monthly income ($)Current monthly debt payments ($)Lender's max debt-to-income (%)Interest rate (%)Term (years)

Maximum you could borrow

–

–Max new monthly payment

–Your current DTI

Loan interest estimator: why the APR is higher than the rate

The interest rate sets the payment. The APR also counts upfront fees, because you pay interest on the full loan but receive the loan minus the fee. A $25,000, 60-month personal loan at 11.5% costs $549.82 a month; with a 3% origination fee ($750) you get $24,250, which makes the APR about 12.8%. The Truth in Lending Act requires lenders to show the APR, so compare offers by APR and total cost.

How lenders decide how much you can borrow

Most lenders cap your debt-to-income ratio (DTI): all monthly debt payments, including the new one, divided by gross monthly income. Typical limits are about 36% for personal loans, 43% to 50% for mortgages (housing payment included), and 28% for the housing payment alone under the classic 28/36 rule. Your credit score, income history and collateral matter too, so treat the maximum as a ceiling, not a target.

Loan payment schedule calculator: the payment formula

Payment = P × i ÷ (1 − (1 + i)⁻ⁿ), where P is the loan, i the monthly rate (APR ÷ 12) and n the number of payments. For the full month-by-month schedule, use the amortization calculator.

Common questions

What is a lending calculator?

It works out a loan's monthly payment, total interest and APR, or the most you could borrow for your income.

How do I estimate loan interest?

Total interest = monthly payment × number of payments − loan amount. $25,000 at 11.5% over 60 months is $7,989 of interest.

How much can I borrow with $6,500 a month income?

With $650 of other debts and a 36% DTI limit, a payment up to $1,690, about $85,300 over 5 years at 7%.

Does an origination fee raise the APR?

Yes. A 3% fee on a 5-year loan adds roughly 1.3 percentage points to the APR.

What DTI do lenders want?

Usually 36% or less for personal loans and up to 43% to 50% for mortgages, depending on the loan program.

Sources

General information, not financial, tax or legal advice. Check important numbers with the official source before acting on them.