See how your money grows with the power of compounding — any frequency, any tenure, with optional regular contributions
Same amount, rate & tenure — just a different compounding frequency.
| Frequency | Times/Year | Final Value | Interest Earned |
|---|
Disclaimer: This calculator uses the standard compound interest formula A = P(1 + r/n)^(nt), where regular contributions (if entered) are added monthly and compounded from their contribution date onward. This is a generic mathematical tool — it does not represent any specific bank, scheme, or investment product's actual terms, fees, or tax treatment. Real-world instruments (FDs, RDs, mutual funds, etc.) may compound differently or have additional charges. Results are illustrative estimates only.
Compound interest is interest calculated on both the original amount you invest (the principal) and on the interest that has already accumulated. Unlike simple interest, which only ever earns interest on the original principal, compound interest lets your earnings themselves start earning — which is why growth accelerates over time rather than staying flat.
Type your initial amount, the annual interest rate, and the number of years — or use the sliders and quick presets for speed.
Choose Yearly, Half-Yearly, Quarterly, Monthly, or Daily and watch the result update instantly.
If you plan to invest regularly rather than as a single lump sum, add a monthly contribution to see its combined effect.
Check the frequency comparison table to see what changing compounding frequency does, then open the Growth Chart to see the curve.
The standard compound interest formula used by this calculator is:
| Variable | Meaning | Example |
|---|---|---|
| P | Principal (initial amount) | ₹1,00,000 |
| r | Annual interest rate (as a decimal) | 8% → 0.08 |
| n | Compounding frequency per year | 12 (monthly) |
| t | Time period in years | 10 years |
| A | Final amount | ₹2,21,964 (approx.) |
Inputs: P = ₹1,00,000 | r = 8% | n = 12 | t = 10 years
Notice that the interest earned (₹1,21,964) is actually larger than the original principal (₹1,00,000) — this is the effect of compounding: in the later years, most of the growth comes from interest earning interest, not from the original amount alone.
Using the same ₹1,00,000 principal at 8% for 10 years, here's how the final amount changes purely based on compounding frequency:
| Frequency | Times/Year | Final Amount (Approx.) |
|---|---|---|
| Yearly | 1 | ₹2,15,892 |
| Half-Yearly | 2 | ₹2,19,112 |
| Quarterly | 4 | ₹2,20,804 |
| Monthly | 12 | ₹2,21,964 |
| Daily | 365 | ₹2,22,535 |
The gap between yearly and daily compounding here is a few thousand rupees on ₹1,00,000 over 10 years — noticeable, but modest. The gap widens considerably at higher rates or longer tenures, which is why the frequency comparison table above updates live with your own numbers.
The compound interest formula is A = P × (1 + r/n)^(n×t), where A is the final amount, P is the principal, r is the annual interest rate as a decimal, n is how many times interest compounds per year, and t is the time period in years. The interest earned is simply A minus P.
Simple interest is calculated only on the original principal every period, so it grows linearly. Compound interest is calculated on the principal plus any interest already earned, so it grows exponentially — the gap between the two widens the longer money stays invested.
Yes, but usually only modestly at typical interest rates. Compounding daily instead of yearly on the same principal, rate, and tenure produces a higher final amount, but the difference is often a few percent rather than dramatic — the interest rate and time invested generally matter far more than compounding frequency alone.
Each monthly contribution starts compounding from the date it's added, so contributions made earlier in your investment period have more time to grow than later ones. Combining a lump sum with regular monthly contributions generally produces a significantly larger final amount than either approach alone, since both the principal and every contribution benefit from compounding.
This calculator uses the standard mathematical compound interest formula and is a good general-purpose tool for understanding how compounding works. However, real financial products often have their own specific rules — FDs may compound quarterly with TDS deductions, mutual funds don't offer a fixed guaranteed rate, and PPF has government-mandated annual crediting. For product-specific numbers, use a dedicated calculator for that instrument.
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