Fixed Deposit Calculator
This fixed deposit calculator tells you how much interest a time deposit earns and how much money you will have at maturity. Enter the capital you place, the nominal annual rate (NAR) offered by the bank, and the term in days, and it instantly returns the interest generated, the total at maturity, and the effective annual return (EAR). A fixed deposit is one of the simplest and safest ways to earn a return on idle cash: you lock the money for a fixed number of days and the bank pays a pre-agreed rate. It is especially popular in Argentina, where savers use short 30-day fixed deposits to protect their pesos from inflation and renew them month after month.
Interest earned
Total at maturity
EAR (effective annual return)
Calculation uses simple interest on a 365-day basis. It does not deduct taxes or fees. The values are estimates and may differ from those of your bank.
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How it works
The interest is calculated with simple interest on a 365-day basis: interest = capital × (NAR / 100) × (days / 365). For example, 100,000 at a 60% NAR for 30 days generates 100,000 × 0.60 × 30/365 ≈ 4,931.51 in interest, so the total at maturity is about 104,931.51. The NAR (nominal annual rate) is the yearly rate the bank quotes, but because a 30-day deposit only runs for a fraction of the year, you only earn the proportional part. The EAR (effective annual return) answers a different question: if you kept renewing the deposit and reinvesting the interest for a whole year, what annual return would you actually obtain? It is computed as (1 + NAR/100 × days/365)^(365/days) − 1, and it is always higher than the NAR because of compounding on each renewal.
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Preguntas frecuentes
- What is the difference between NAR and EAR?
- The NAR (nominal annual rate) is the yearly rate the bank quotes, applied proportionally to the term with simple interest. The EAR (effective annual return) is what you would actually earn over a full year if you kept renewing the deposit and reinvesting the interest, so it accounts for compounding. The EAR is always higher than the NAR when there is more than one renewal per year.
- How is the interest on a fixed deposit calculated?
- With simple interest on a 365-day basis: interest = capital × (NAR / 100) × (days / 365). For example, 100,000 at a 60% NAR for 30 days earns 100,000 × 0.60 × 30/365 ≈ 4,931.51, and the total at maturity is around 104,931.51. Only the fraction of the year covered by the term is paid.
- What does renewing a fixed deposit mean?
- Renewing means that, at maturity, the capital plus the interest earned is placed again as a new fixed deposit for another term. By reinvesting the interest each time, you earn interest on interest, which is exactly the compounding effect the EAR measures. Many banks let you set automatic renewal so the deposit rolls over on its own.
- Why are fixed deposits so popular in Argentina?
- Because of persistent high inflation, savers use short 30-day fixed deposits to try to keep their pesos from losing purchasing power. They lock in a rate for the month, collect the interest, and renew. It is a simple, low-risk instrument, although whether it beats inflation depends on how the rate compares with the monthly price increase.
- Does this calculator deduct taxes or fees?
- No. It shows the gross interest and total using simple interest on a 365-day basis. Depending on your country and the amount, the real return may be affected by taxes, withholdings, or fees, so treat the figures as an estimate and check the exact terms with your bank.