Lump Sum Calculator — One-Time Investment Returns
Enter the amount you invest today, the expected annual return, and the investment period to see how your lump sum grows — including total wealth gained and absolute return percentage.
%
years
Value of the one-time investment at the end of the period (monthly compounding)
- 1
Monthly rate
12% ÷ 1200 = 0.01 - 2
Total months
10 × 12 = 120 - 3
Growth factor
(1 + 0.01)^120 = 3.3004How much each unit of principal grows over the full investment period. - 4
Future value
100,000 × 3.3004 = 330,039
How does this calculator work?
FV = P × (1 + r/1200)^(12n). At 12% annual return, ₹1 00 000 invested today grows to ≈ ₹3.3 lakh in 10 years and ≈ ₹10.9 lakh in 20 years. Compounding means later years add far more absolute value than early years. Subtract expense ratios and applicable capital gains tax for a realistic net return.
Formula
How this is calculated
A lump sum investment means putting a single amount of money to work today rather than spreading it across regular contributions. The calculator uses monthly compounding (r/12 per period) which is standard for mutual fund NAV calculations, though the difference from annual compounding is small at typical rates and time horizons.
The future value formula FV = P × (1 + r/1200)^(n×12) compounds the return each month. At 12% annual return over 10 years, ₹1 00 000 grows to ₹3 30 039 — a 230% absolute return driven by compounding: the growth in later years accelerates because previous gains themselves earn returns.
The expected return rate is the most uncertain input. Equity mutual funds in India have historically delivered 10–15% CAGR over long periods, but past performance does not guarantee future returns. The calculation assumes a constant annual rate and ignores taxes, expense ratios, and inflation. Subtract fund expense ratios (typically 0.5–1.5%) and long-term capital gains tax (10% on gains above ₹1 lakh in India) to estimate the after-cost, after-tax result.
Frequently asked questions
A lump sum investment is a single one-time investment of a fixed amount, as opposed to making recurring contributions (like a SIP). It is suited when you have a windfall, a bonus, or savings you want to put to work immediately.
Neither is universally better. A lump sum benefits from more time in the market from day one — all capital is invested immediately and compounding starts at full scale. A SIP benefits from rupee-cost averaging, reducing timing risk by buying at different market levels. In a steadily rising market, lump sums generally outperform; in volatile or falling markets, SIP averages in at lower costs. Many investors use both: lump sum a windfall and then add via SIP from income.
Mutual fund NAVs are calculated daily (compounding is effectively continuous), but monthly compounding is a close and conventional approximation. The difference between monthly and annual compounding at typical rates (10–15%) is under 0.5% in total returns over 10 years — well within the uncertainty of the return estimate itself.
Also known as
TG we-Calculate Editorial Team. (2026). Lump Sum Calculator — One-Time Investment Returns [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/lumpsum-calculator
TG we-Calculate Editorial Team. "Lump Sum Calculator — One-Time Investment Returns." TG we-Calculate. 2026. https://we-calculate.com/calculator/lumpsum-calculator.
TG we-Calculate Editorial Team, "Lump Sum Calculator — One-Time Investment Returns," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/lumpsum-calculator
@misc{wecalculate_lumpsum_calculator, title = {Lump Sum Calculator — One-Time Investment Returns}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/lumpsum-calculator}}, year = {2026}, note = {TG we-Calculate} }
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