What is the Lumpsum?
A lumpsum investment is a one-time investment of a larger amount — a bonus, matured FD, property sale proceeds or accumulated savings — instead of monthly instalments. The entire amount starts compounding from day one, which gives lumpsum investing the highest expected growth when markets do well, along with more short-term ups and downs than a SIP.
The doubling shortcut worth memorising is the Rule of 72: divide 72 by your annual return to get the years needed to double. At 12%, money doubles roughly every 6 years — so ₹5 lakh becomes ~₹10L in 6 years, ~₹20L in 12 and ~₹40L in 18.
Formula & worked example
Future value with annual compounding:
where P is the amount invested, r the annual return and n the years held.
Worked example: ₹5,00,000 at 12% for 10 years → FV = 5,00,000 × (1.12)10 = 5,00,000 × 3.106 ≈ ₹15.53 lakh. The gain of ₹10.53 lakh is more than twice the amount invested — and ₹4.6 lakh of it comes in just the last 3 years, which is compounding’s signature back-loaded curve.
How to use this lumpsum calculator
- Enter the amount you want to invest today.
- Set the expected annual return for your chosen asset — 11–13% for equity funds, 7–8% for debt or FDs, 8% for gold’s long-run average.
- Pick the holding period and open the table to watch the growth curve steepen.
- Compare with the SIP calculator if you are deciding between investing at once or monthly.
Smart tips
- If investing in equity, consider spreading a big lumpsum over 6–12 months (STP) to reduce the risk of a bad entry point.
- Match the asset to the horizon: equity needs 7+ years; for money needed within 3 years prefer FDs or debt funds.
- Rebalance once a year — book some equity profit into debt when your allocation drifts far from plan.
- Never invest your emergency fund as a lumpsum in equity, however tempting the market looks.
- Check post-tax returns: equity LTCG above ₹1.25L/yr is taxed at 12.5%, debt at your slab — taxes change the real comparison.
Frequently asked questions
Lumpsum or SIP — which gives better returns?
Mathematically a lumpsum wins in rising markets because all the money compounds longest. But it also risks a bad entry point. SIPs average your cost and suit salaried cash flow. Many investors do both: SIP from salary, lumpsum (spread over some months) for windfalls.
Where can I invest a lumpsum amount?
Common options: mutual funds (equity/hybrid/debt), fixed deposits, PPF (up to ₹1.5L/yr), government bonds, gold and index funds. The right choice depends on horizon and risk appetite, not on the product’s advertising.
What return should I assume?
Use conservative long-run averages: 11–13% for diversified equity funds, 7–8% for quality debt/FDs, ~8% for gold. Planning with an optimistic number is the most common calculator mistake.
How long does money take to double?
Divide 72 by the annual return (Rule of 72). At 8% money doubles in ~9 years; at 12% in ~6 years; at 15% in under 5.
Does this calculator account for inflation?
The result is in future rupees. To see today’s purchasing power, check our Inflation Calculator — ₹15.5 lakh in 10 years is worth about ₹8.6 lakh today at 6% inflation.
Want the theory behind the numbers? Read our investing guides on the Money Blog.