Personal Loan Calculator — Payments & Total Interest

A personal loan looks simple — borrow a sum, pay it back monthly — but the APR and the term together decide whether you repay a little more than you borrowed or a startling amount more. This calculator shows your monthly payment (your EMI, if you are comparing with lenders who use that term), the total interest, and the true total cost before you apply.

How it works

Enter the amount you want to borrow, the APR you have been quoted (or a realistic estimate for your credit profile), and the repayment term. The calculator produces your fixed monthly payment, the total amount repayable, and the total interest over the life of the loan.

Use it before you apply, not after. Comparing a 3-year and a 5-year quote at the same APR — or the same term at two different APRs — takes seconds here and can save hundreds.

How the calculation works

Personal loans are amortizing loans with a fixed payment, calculated with the standard formula:

Payment = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)

where P is the amount borrowed, r is the monthly rate (APR ÷ 12), and n is the number of monthly payments. EMI — Equated Monthly Instalment — is simply the name many lenders use for this same fixed payment; each instalment contains some interest and some capital, with the interest share falling over time as the balance shrinks.

APR is designed to be the comparison number: in the UK it must include mandatory fees, and the representative APR must be offered to at least 51% of accepted applicants — meaning up to 49% of borrowers pay more. In the US, origination fees of 1–8% on some online loans are sometimes deducted from the amount you receive rather than added to the payment, so check whether borrowing $15,000 means receiving $15,000. Interest is charged on the outstanding balance, so making extra payments reduces future interest — but check for early repayment charges, which in the UK are capped by regulation on most personal loans at roughly one to two months’ interest, and in the US appear on some subprime products.

Worked example: $15,000 at 11.5% APR over 36 months

Step 1 — Monthly rate. r = 11.5% ÷ 12 = 0.9583% per month. n = 36 payments.

Step 2 — Apply the formula. (1.009583)³⁶ ≈ 1.4096. Payment = $15,000 × 0.009583 × 1.4096 ÷ 0.4096 ≈ $495 per month.

Step 3 — Total cost. $495 × 36 = $17,820 repaid in total, of which $2,820 is interest — about 19% on top of what you borrowed.

Step 4 — Compare stretching the term. Over 60 months the payment falls to about $330, which feels easier, but total interest climbs to roughly $4,800. You pay about $2,000 extra for the lower payment — and you are still repaying the loan two years after a 3-year borrower is debt-free.

Things to watch

• The rate you are offered may not be the rate advertised. Headline APRs assume an excellent credit profile. A borrower quoted 19.9% instead of 11.5% on the example loan would pay about $556 a month and $5,020 in interest — nearly double the cost of credit. Improving your credit score before a large loan is worth real money.
• Shorter terms save disproportionately. Halving the term does not double the payment, because so much of a long loan’s payment is interest. Always price the shortest term whose payment you can genuinely afford, and stress-test it against a drop in income.
• Watch for fees dressed as features. Origination fees, late payment fees, and bundled payment-protection products all raise the real cost. In the UK, payment protection on loans has a long mis-selling history — buy insurance separately if you want it, and only if you need it.
• Debt consolidation only works if the behaviour changes. Consolidating credit cards at 24% APR into a loan at 11.5% is sound maths, but if the cleared cards fill up again you end up with both debts. Close or cut up the cards.
• Check early repayment terms before you overpay. UK-regulated loans must allow partial and full early repayment, with charges limited by law. US borrowers should confirm there is no prepayment penalty. If overpaying is penalty-free, even small extra payments early in the term save the most interest.

Frequently asked questions

What is an EMI?
EMI stands for Equated Monthly Instalment — the fixed monthly payment on an amortizing loan, used widely by lenders in the UK, US online lending, and internationally. It is not a different kind of loan; it is the same payment this calculator produces, split between interest and capital each month.

How much can I borrow with a personal loan?
UK high-street lenders commonly offer £1,000–£25,000 (some to £50,000), and US lenders commonly $1,000–$50,000 or more. The real limit is affordability: lenders assess whether the payment fits your income after existing commitments, and larger amounts usually require stronger credit histories.

Will checking my rate hurt my credit score?
In the UK, eligibility checkers use soft searches that do not affect your score; a full application leaves a hard search. In the US, pre-qualification is usually a soft inquiry, and multiple hard inquiries for the same loan type within a short rate-shopping window (typically 14–45 days depending on the scoring model) generally count as one.

Is a personal loan better than a credit card?
For a planned, one-off cost repaid over a fixed period, usually yes: rates are lower than standard card APRs and the fixed end date enforces discipline. A 0% purchase or balance-transfer card can be cheaper if — and only if — you clear the balance before the promotional rate expires.

Can I get a personal loan with bad credit?
Options exist, but rates rise steeply — 30% APR and above is common for poor-credit loans, at which point interest can rival credit card costs. A smaller amount, or waiting to improve your file, may cost far less.

This calculator is for guidance only and isn’t financial advice.