Personal Loan Calculator

Disclaimer: This calculator is provided for educational and estimation purposes only and does not constitute formal financial advice.

The payment, the interest, and the fee

A personal loan is the plainest loan there is: an unsecured amount, one fixed rate, one term, and a payment that never changes until the balance is zero. That plainness is exactly why it deserves its own calculator rather than being folded into the mortgage or auto tools — because the feature that defines the personal loan market is not the math of the payment, it is the origination fee, deducted from your proceeds before the money ever reaches your account.

The calculator above reports the whole picture. Enter the amount you want to borrow, the APR you were quoted, the term in months, and any origination fee as a percentage of the amount, and it returns the fixed monthly payment, the cash that actually arrives, the interest over the term, the all-in cost, and the effective APR — the rate that is real once the fee is priced in.

How the payment is built

With a monthly rate i equal to the APR divided by twelve and n months of term, the payment PMT that retires the loan P exactly on schedule is the standard amortization formula:

On the default scenario — $10,000 at 11.5% APR over 36 months — that is $329.76 a month. Each payment covers that month’s interest first, and whatever remains reduces principal, which is why the first payment is $95.83 of interest and only $233.93 of principal, while the final payment is almost entirely principal. Across the full term the payments add up to $11,871, so the loan costs $1,871 in interest — about 18.7% of everything borrowed.

What an origination fee does to the money you receive

Many personal loan lenders charge an origination fee of anywhere from zero to around ten percent of the amount, deducted from the proceeds. The payments, however, amortize the full amount you borrowed — not the amount you received:

Borrow $10,000 with a 5% fee and $9,500 arrives, but the monthly payment is still computed on $10,000. You are paying interest, and an effective premium, on $500 you never saw. This is the single most misunderstood feature of the product: borrowers compare quoted APRs across lenders and never price the fee, even when one lender at 11.5% with no fee is cheaper than another quoting 11% with a 5% fee.

The effective APR, solved from what you actually got

The honest way to price the fee is to ask: what rate discounts my fixed payments back to exactly the cash that arrived?

That equation has no closed-form solution for the rate, so the calculator solves it numerically. On the default loan the answer at a zero fee is exactly the quoted 11.5%; every point of fee pushes the effective rate higher:

Read the table as two lessons. First, the quoted APR never moves — the lender’s headline number is the same in every row, and only the effective APR exposes the difference. Second, on this loan each point of origination fee adds roughly three-quarters of a point to the effective rate, so a “small” fee is not small at all over a three-year term.

What the term costs

The term is the lever people reach for first, because it moves the monthly payment fastest. It moves the total cost fastest too, in the opposite direction:

Stretching the same $10,000 loan from 24 to 60 months cuts the payment by $248.47 and adds $1,954 of interest — the longer-term borrower with the “affordable” payment pays about 17% more for the identical amount borrowed. There is no correct answer, only a budget constraint: the 50/30/20 budget calculator is how you find out what a payment can actually be, and the term should be the shortest one that fits it.

A 0% promotional offer collapses the whole table: at 0% APR the payment is just the amount divided by the term — $277.78 a month over 36 months for the default loan — and the effective APR is 0% regardless of term. Those offers are rare on personal loans and usually carry the fee structure to watch for.

When a personal loan is the right tool

A personal loan earns its place in three situations. First, as a debt-consolidation vehicle: rolling several high-rate balances into one installment loan at a single rate turns a pile of minimum payments into one fixed payment with a fixed end date, and the debt consolidation calculator compares that against leaving the debts where they are. Second, as a substitute for revolving a card balance: a card at a similar rate paid on minimums can run for decades, which the credit card payoff calculator documents in years and dollars — the personal loan is that fixed-payment plan with a contract attached.

Third, rarely, as a spending tool: a wedding, a medical bill, a consolidation of ambition. That is the case to be most skeptical of, because the fee-and-interest structure prices the loan before life prices the plan. One boundary worth knowing: student debt generally does not move to personal loans on favorable terms — federal protections are lost and unsecured rates are rarely better — so education balances belong in the student loan payoff calculator, not this one.

Keep the loan boring

The personal loan market prices your credit, your amount, and your term — and sometimes hopes you stop reading at the quoted APR. The calculator exists so you do not: check the payment, check the all-in cost, and above all check the effective APR when a fee is on the table. The boring loan — short term, no fee, payment the budget already fits — is genuinely the cheap one, and now you can see all three numbers before you sign.