Compounding Calculator
See exactly how compound interest grows your money — and how much compounding frequency actually matters.
Final value
₹1,48,595
Interest earned: ₹48,595
Year-by-year growth
| Year | Value |
|---|---|
| 1 | ₹1,08,243 |
| 2 | ₹1,17,166 |
| 3 | ₹1,26,824 |
| 4 | ₹1,37,279 |
| 5 | ₹1,48,595 |
Compounding tips
- Tenure usually matters more than compounding frequency — a longer horizon beats chasing a slightly higher compounding frequency.
- Compare a product's advertised compounding frequency against this calculator to see the real effect on your numbers.
- Remember this shows pre-tax growth — most interest income in India is taxable at your slab rate.
How it's calculated
Compound interest grows a principal by adding interest to it at regular intervals, so future interest is earned on both the original principal and the interest already added — unlike simple interest, which only ever earns on the original principal.
M = P × (1 + r/n)^(n × t)
Example
₹1,00,000 at 8% for 5 years, compounded quarterly, grows to roughly ₹1,48,595 — ₹48,595 in interest, more than the ₹40,000 you'd earn at the same rate under simple interest.
About compound interest
Compound interest is the mathematical engine behind almost every calculator on this site — FD, RD, SIP, PPF and more all use some variant of it. This calculator strips away any specific product framing to let you experiment directly with the core formula: principal, rate, tenure and compounding frequency.
How it works
Interest is calculated and added to the principal at fixed intervals (yearly, half-yearly, quarterly, monthly or daily). Each time interest is added, the next period's interest is calculated on the new, larger balance — that's the "compounding" effect, and it's why compound interest grows faster than simple interest over time.
How to use it
- Set your principal, interest rate and tenure.
- Try different compounding frequencies to see how much of a difference they actually make on your numbers.
- Use the year-by-year chart to see how the growth curve accelerates over time — that's compounding visibly at work.
Strategies
Compounding frequency matters less than most people assume — the annual rate and, above all, the tenure do far more of the work. A longer tenure at a modest rate usually beats a short tenure at a much higher rate, because compounding needs time to build momentum. Use this calculator to compare a few tenure/rate combinations before optimizing for compounding frequency alone.
Important caveats
- This is a generic maths tool — it doesn't model any specific product's rules, taxes, fees, or withdrawal restrictions.
- The interest rate you enter is treated as fixed for the full tenure; a real investment's rate may change over time.
- Interest earned on most Indian financial products is taxable — this calculator shows pre-tax growth.
Why it works
The formula divides the annual rate by the number of compounding periods per year to get a per-period rate, then applies that rate compounding-style — multiplying, not adding — across every period in the tenure. More periods per year means interest gets added back into the principal more often, which is why higher-frequency compounding always edges out lower-frequency compounding at the same nominal annual rate.
Benefits
- Lets you isolate and understand the pure effect of compounding, separate from any product's specific rules.
- The year-by-year chart makes the "slow start, fast finish" nature of compounding visually obvious.
- Useful for comparing compounding frequency claims across different products (e.g. "compounded daily" marketing claims).
Frequently asked questions
How much difference does compounding frequency actually make?
More frequent compounding always grows a given principal faster at the same annual rate, but the difference between, say, monthly and daily compounding is usually small — it's the annual rate and the tenure that matter far more. Try switching frequencies on the same principal and rate to see the real-world size of the difference.
Is this the same as the FD Calculator?
The underlying maths is identical — compound interest is compound interest — but this calculator is a general-purpose visualizer, not tied to a bank product, with a year-by-year growth chart. Use the FD Calculator if you specifically want fixed-deposit framing (maturity value, senior citizen rates, etc.).
What is the formula used here?
M = P × (1 + r/n)^(n×t), where P is principal, r is the annual rate, n is the number of compounding periods per year, and t is the tenure in years — the standard compound interest formula.
Learn more from official sources
- Reserve Bank of India (RBI) — regulator for Indian banks and deposit products.
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