Lumpsum Calculator
Compound a one-time investment over time at an expected annual return.
What this calculator does
A lumpsum investment is what happens when you have a chunk of money sitting somewhere earning nothing — a maturing FD, a bonus, a bit of inheritance, sale proceeds — and you finally decide to put it to work. The math is the cleanest version of compounding: ₹P grows to ₹P × (1 + r)^n. That's it.
The trap most Indian investors fall into with lumpsums is trying to time the market. They see their ₹5 lakh, look at the Nifty, decide 'it's too high right now', and then either the market runs away and they invest higher later, or it falls a bit and they wait for it to fall more, and years pass with the money sitting in a 3.5% savings account earning nothing.
The safer approach for anything above ₹2-3 lakh is a Systematic Transfer Plan (STP): park it in a liquid fund, then move it into equity funds over 6-12 months. You lose a little upside if the market rallies, but you avoid the worst-case regret of investing everything a day before a 20% crash. Use this calculator to see the full-lumpsum best case, then be honest that you'll probably STP it in — the outcome will still be excellent.
FV = P × (1+r)^nVariables explained
- Principal (P)
The one-time amount you're investing.
- Annual return (r)
Expected long-term CAGR — 10-12% for equity, 6-8% for debt.
- Time (n)
Years the money stays invested. Longer is exponentially better.
Worked example: ₹5 lakh lumpsum for 15 years at 11%
P = ₹5,00,000 · r = 11% · n = 15 years.
FV = 5,00,000 × (1.11)^15 ≈ 5,00,000 × 4.785 ≈ ₹23.9 lakh.
Gain: ₹18.9 lakh from a single decision to invest ₹5 lakh once. If you invested the same amount for 25 years, the corpus would be ~₹67.9 lakh. Time is the multiplier.
How to read your projection like an adult
Every investment calculator has one built-in lie: the return rate is an assumption, not a promise. If you use 12% for Indian equity mutual funds, that's a rough long-term average — not what your specific SIP will do next year. Markets are lumpy. The projection is a compass, not a GPS.
Run three scenarios: pessimistic (say 8%), realistic (10-11%), and optimistic (13%). If the pessimistic case still gets you close to your goal, you have a robust plan. If only the optimistic case works, you're one bad market cycle away from disappointment — increase your contribution, extend your timeline, or lower the goal.
Also, watch inflation. ₹1 crore in 2046 will buy roughly what ₹30 lakh buys today (at ~6% inflation). The number that looks huge on a projection is smaller in real purchasing power.
Don't stop contributing when the market falls. That's mathematically the worst time to stop. The whole point of a SIP is that you buy more units when prices are low.
Common mistakes
- ✗Trying to time the market and staying in cash for 6-12 months.
- ✗Putting all of it in one small-cap fund because it topped some ranking list.
- ✗Redeeming after a market fall in year 2. Long-term means long-term.
- ✗Ignoring STP as an option for large amounts (>₹5 lakh).
Frequently asked questions
Should I invest my bonus as a lumpsum or spread it out?+
Under ₹2 lakh: lumpsum is fine. Above that, an STP over 3-6 months reduces regret risk.
Which fund type suits a lumpsum?+
For 5+ year horizons: flexi-cap or index funds. For 1-3 years: hybrid or short-duration debt. Never small-cap for a short horizon lumpsum.
Is a lumpsum better than SIP?+
Mathematically yes if you invest at a low. Practically no, because most investors can't time consistently. SIP wins for people with monthly income.
Reminder: this calculator is a learning tool, not personalised advice. For decisions involving your actual money, talk to a SEBI-registered adviser about your specific situation.