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No. 3Compound interest
Build your projection
Start with the numbers you know. We will show the balance, what you put in, and what the assumption adds.
Estimated balance
₦8,166,967
You start with ₦0 and add ₦100,000 every month for 5 years. Assumed return: 12% a year.
You put in
₦6,000,000
Projected growth
₦2,166,967
Over this stretch, your own deposits are still doing most of the work. Growth has not overtaken them within these 5 years at this rate.
This estimate assumes contributions arrive at the end of each month and the return compounds monthly.
Balance You put in Projected growth Tap or hover for an exact year.
Make the estimate more realistic Optional
Use these only when you know them. Fees reduce your assumed return. Inflation also shows the result in today’s money.
Keep this scenario for next time
Save one scenario in this browser, then revisit it when your saving plans change. Anyone using this browser profile can restore it. It is not sent to us, and clearing site data removes it.
Read your result
Your deposits and your growth
Your deposits are the starting amount plus the money you add. Growth is the difference between the projected balance and those deposits. A bigger balance does not mean the whole amount was earned.
A monthly naira example
Start with ₦0 and add ₦100,000 at the end of each month for five years. At a hypothetical 12% annual return, compounded monthly, with no fees or tax, the result is about ₦8,166,967. You put in ₦6,000,000. The remaining ₦2,166,967 is projected growth. The 12% rate is an illustration, not a forecast or an available fund rate. Example calculated 24 September 2026.
See the worked example, including fees and inflation →
Questions about the calculator
How does this compound interest calculator work?
The calculator divides the annual return, after the fee assumption, by the number of compounding periods in a year. It applies that rate to the balance, then adds the contribution for each period. Growth stays in the balance for the next period. Contributions are spread evenly across compounding periods when the two frequencies differ. Daily compounding uses 365 periods a year.
Which return should I enter?
Use the return as an assumption to test. Try a lower rate as well and see how much the result changes. The default rate is not a recommendation, and a recent fund return does not establish what it will earn in future. A published effective annual yield already includes compounding, so it is not interchangeable with this calculator’s annual rate input.
How are fees and inflation handled?
The annual fee is subtracted from the annual return as a simple percentage-point adjustment. For example, 12% return less 1% fee becomes 11% before compounding. Real fee structures can differ. If you enter inflation, the final balance is divided by the cumulative price increase to express its buying power in today’s money. That figure is not inflation-adjusted investment profit.
Is the result guaranteed?
No. This is a projection with a constant return and contribution amount. It does not model tax, withdrawals, missed deposits, changing returns or future exchange-rate movements. A real investment can lose money.
Can I save this scenario?
Choose Save in this browser to keep one scenario in this browser profile. When you return, choose Restore saved scenario. Saving again replaces the saved copy; Delete saved scenario removes it. Anyone using the same browser profile can restore it, and clearing site data removes it. Copy link and Share include the chosen numbers in the link for whoever receives it.