A mutual fund pools capital from many investors into a professionally managed portfolio of stocks, bonds, or money market instruments. Unlike a fixed-income instrument such as a Treasury Bill, mutual fund returns are variable — driven by the performance of the fund’s underlying assets rather than a rate fixed at purchase.

This calculator projects portfolio growth from a lump sum and optional monthly contributions (a “SIP,” or Systematic Investment Plan), or works in reverse to estimate the capital required to sustain a target monthly income.

The Variables This Calculator Measures

• Fund Type — Money Market, Fixed Income/Bond, Balanced, or Equity, each carrying a different risk profile and illustrative return.
• Initial Investment — the lump sum committed at the start.
• Monthly Deposit (SIP) — optional recurring contributions added to the portfolio each month.
• Expected Annual Return / Yield — an assumed rate, not a guaranteed outcome; adjustable to match your own research.
• Target Monthly Income — used in reverse-calculation mode to determine the capital required to sustain a chosen monthly payout.

Fund type is the single most important input here — a Money Market fund and an Equity fund are both “mutual funds,” but carry fundamentally different risk and volatility profiles. For a full breakdown of Nigerian fund categories and how to match one to your goal, see our guide: Read our complete guide to mutual funds in Nigeria.

Calculation Methodology

The Wealth Growth projection compounds your expected annual return monthly, adding your monthly deposit (SIP) at the end of each compounding period:

The Monthly Income Estimator uses a simpler relationship, calculating the capital required to sustain a target payout from yield alone, leaving principal intact:

Fund Types & Risk

Money Market and Fixed Income/Bond funds are generally lower-volatility, income-focused vehicles. Balanced funds mix equities and fixed income for moderate risk. Equity funds carry the highest volatility but the greatest long-term growth potential. The illustrative rates used as starting points in this calculator are not fixed and change with prevailing market conditions.

Sources

Mutual funds in Nigeria are regulated by the Securities and Exchange Commission (SEC Nigeria). Fund categorization and risk disclosure requirements follow SEC guidelines for collective investment schemes. This calculator performs arithmetic only on the figures and assumed rate you provide — it does not reflect the current published return of any specific fund.