Mutual Fund Calculator

Project the future value of a mutual fund investment that combines a one-time lump sum with a recurring monthly SIP, compounded at your expected annual return.

Quick Facts

Formula
FV = P0×(1+i)^n + SIP×[(1+i)^n−1]/i×(1+i)
i is the monthly return (annual rate ÷ 12) and n is total months (years × 12); the SIP term is valued as an annuity due (deposit at the start of each month).
Assumption
One constant annual return, no fees
Real mutual fund returns vary year to year and are usually reported net of expense ratio — this model applies a single rate for the whole period.

Your Results

Calculated
Estimated future value
-
Projected maturity value
Total amount invested
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Lump sum + all SIP deposits
Estimated wealth gained
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Future value minus total invested
Absolute return
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Wealth gained ÷ total invested

Ready

Enter your lump sum, monthly SIP, expected annual return, and duration, then press Calculate.

How the Mutual Fund Calculator works

This tool projects how a mutual fund investment could grow over time by combining two building blocks: a lump sum invested today that compounds at your expected annual return, and a monthly SIP (systematic investment plan) contribution added on the same schedule. It applies the standard compound-growth formula used across SIP and mutual fund calculators.

The formula

For an initial lump sum P0, a monthly SIP amount SIP, a monthly rate i (the expected annual return divided by 12), and n total months (years × 12), the projected future value is:

FV = P0 × (1 + i)n + SIP × [((1 + i)n − 1) / i] × (1 + i)

The first term is ordinary compound interest on the lump sum. The second term is the future value of an annuity due — it assumes each SIP installment is invested at the start of its month, which is how most fund houses schedule SIP debits, so each contribution gets one extra month of compounding compared with an end-of-month annuity. If the expected annual return is 0%, the SIP term reduces to simply SIP × n — the contributions summed with no growth.

Worked example

Take the defaults: a $5,000 lump sum, a $500 monthly SIP, a 10% expected annual return, over 15 years. The monthly rate is 0.10 / 12 ≈ 0.00833 and n = 180 months. The lump sum alone grows to roughly $22,270, and the SIP contributions grow to roughly $208,960, for a combined future value near $231,230. Total money invested over the period is $5,000 + ($500 × 180) = $95,000, so the estimated wealth gained is about $136,230 — an absolute return of roughly 143% on the amount actually put in.

What moves the result most

  • Time in the market: because growth compounds monthly, duration has an outsized effect — the same inputs run for 25 years instead of 15 produce a future value several times larger, not just proportionally larger.
  • Expected annual return: a higher assumed rate compounds faster every month; small changes in this single input swing the projection more than almost any other field, which is exactly why it should be treated as an assumption, not a promise.
  • Monthly SIP amount: since SIP contributions are added every month for n months, this field usually contributes more to the final total than the one-time lump sum unless the lump sum is very large.

Lump sum versus SIP investing

Investing a lump sum puts all the money to work immediately, so it benefits most when returns are assumed constant and positive throughout the full period. A monthly SIP spreads contributions out, which in real markets can average the purchase price across ups and downs (dollar-cost averaging) — a benefit this calculator does not model directly, since it assumes one constant rate rather than fluctuating markets. Use this projection as a transparent baseline, not a forecast of actual fund performance.

Frequently Asked Questions

How does this Mutual Fund Calculator work?
It projects the future value of a mutual fund investment by combining two components: a lump-sum contribution that compounds at the periodic rate, and a monthly SIP (systematic investment plan) contribution valued as an annuity due. The formula is FV = P0 × (1 + i)^n + SIP × [((1 + i)^n − 1) / i] × (1 + i), where i is the annual return rate divided by 12 and n is the number of months (years × 12).
What annual return rate should I enter?
The expected annual return is an assumption you supply, not a guarantee. Mutual fund returns vary from year to year and past performance never assures future results. The calculator simply applies whatever constant rate you enter; it does not predict or recommend a return.
What happens if I only invest a lump sum, or only a monthly SIP?
Set the field you are not using to 0. With only a lump sum, the SIP term drops out and the result is simple compound growth of your initial deposit. With only a monthly SIP, the lump-sum term drops out and the result is the future value of your recurring deposits alone.
Does this include expense ratios, taxes, or exit loads?
No. The calculator projects gross growth at your assumed annual return only. Expense ratios, capital gains or dividend taxes, and exit loads for early redemption are not modeled, so compare the estimate against fund literature before relying on it.

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