Three inputs — how much you borrow, at what nominal rate, for how long — and you get the monthly installment plus the number banks don’t put in bold: the total interest over the life of the loan. The calculator is bank-neutral and currency-neutral, so it works equally for a cash loan in dinars and a car loan in euros.
Fill in amount, rate and term to see the installment.
Informational annuity math — not a bank offer, not financial advice. Real offers add fees (EKS) and their own rounding.
How it works
The installment uses the standard annuity formula: every month you pay the same amount, of which an ever-smaller part is interest (charged on the remaining balance at the annual rate divided by 12) and an ever-larger part is principal. Borrow 20,000 at 6% for 5 years and the installment is 386.66 — 100 of the first one is interest, and by the end almost none is.
The rate you enter is the nominal annual rate (NKS in Serbian bank offers). The effective rate (EKS) that banks must also disclose additionally bakes in fees — application costs, insurance, account maintenance — which this calculator deliberately does not guess at. Your real total cost is therefore this result plus fees; when comparing offers, compare EKS to EKS.
The interest share figure at the bottom is the quickest sanity check when comparing scenarios: on short consumer loans it is typically under 15% of everything you pay; on long mortgages it can approach half.
Practical examples
A 20,000 loan at 6% for 5 years
Installment 386.66, total paid 23,199.35, of which 3,199.35 is interest — 13.8% of all payments. The reference example used throughout our loan tools.
A cash loan in dinars
1,500,000 RSD at 11.5% for 7 years: installment 26,079.69 RSD, and total interest of 690,694.16 RSD — nearly half the borrowed amount. Rates matter much more on long terms.
Same loan, shorter term
Type the same amount and rate with 4 years instead of 5. The installment rises, but watch the total-interest row shrink — that trade-off is the core decision of every loan.
Checking a bank’s offer sheet
Enter the amount, NKS rate and term from the offer. If the bank’s installment is noticeably higher than the result here, the difference is fees or insurance built into the payment — ask what exactly.
Frequently asked questions
What is an annuity installment?
A constant monthly payment computed so the loan is exactly repaid at the end of the term. Inside it, the interest/principal mix shifts every month: early payments are interest-heavy, late ones almost pure principal. It is the standard model for consumer and housing loans in Serbia and most of Europe.
Why does my bank quote two rates, NKS and EKS?
NKS is the nominal interest rate — what this calculator uses. EKS (effective rate) additionally includes mandatory fees and costs, so it is always at least slightly higher and is the legally comparable number between banks. This tool computes pure interest; add fees to get the full picture.
Which currency does the calculator use?
None — amounts come out in whatever you put in. For EUR-indexed loans enter euros; for cash loans enter dinars. Just don’t mix units between fields.
Is the rate fixed or variable in this calculation?
The math assumes the rate stays constant for the whole term. Variable-rate loans (e.g. EURIBOR + margin) will drift from this result whenever the reference rate moves — treat the output as a snapshot at today’s rate.
Why is my first installment mostly interest?
Because interest is charged on the outstanding balance, which is largest at the start. On 20,000 at 6%, the first month carries 100 of interest; as the balance falls, the same installment repays more and more principal. The repayment-schedule tool shows this month by month.
How can I reduce the total interest?
Three levers: a lower rate (negotiate, compare banks), a shorter term (higher installment, much less interest), or early repayments — our early-repayment calculator quantifies that third lever exactly.
Does this include loan insurance, fees or the notary?
No — deliberately. Those vary by bank and product and belong to the EKS. The result here is the pure interest mathematics that every offer shares, which is exactly what makes offers comparable.
Is anything I type sent anywhere?
No. The calculation runs in your browser; loan amounts you consider are nobody’s business but yours, and analytics never receives values.
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