Compound Interest Calculator — Grow Savings & Investments
See how a starting amount plus regular monthly contributions grows over time at any compound interest rate.
- Total contributed
- RM 130,000.00
- Interest earned
- RM 102,643.24
- Starting amount
- RM 10,000.00
- · Contributions are assumed to occur at the start of each month. Results ignore tax, fees, and inflation.
About this calculator
Compound interest is interest earned on both your original principal and the interest already accumulated. Over long horizons the effect is dramatic — Einstein supposedly called it the eighth wonder of the world. The formula for a single deposit is FV = P × (1 + r/n)^(n·t), where r is the annual rate, n is the number of compounding periods per year, and t is the number of years. When you also add a fixed amount each month, the contributions form an annuity, and the future-value formula becomes FV = P × (1 + r/n)^(n·t) + PMT × [((1 + r/n)^(n·t) − 1) ÷ (r/n)]. Two things move the needle most: the contribution amount and the time horizon — far more than chasing an extra one or two percent of return. For Malaysian savers, EPF (≈5–6% historical dividends), ASB (≈4–5%), Amanah Saham unit trusts, and fixed deposits (≈3–4%) are common reference rates. This calculator works in any currency — change the inputs as you like and the output is shown in MYR.
Formula
FV = P × (1 + r/n)^(n·t) + PMT × [((1 + r/n)^(n·t) − 1) ÷ (r/n)]
Example calculation
Example: RM10,000 + RM500/month for 20 years at 5%
After 20 years you would have around RM232,000, of which roughly RM120,000 is interest earned — more than the RM110,000 you actually deposited.