Watch your savings grow over time.
See how an initial deposit and regular monthly contributions compound into a future balance — with a year-by-year growth chart, all calculated instantly in your browser.
Step 1 — Inputs
Savings & investment calculator
Enter your initial deposit, monthly contribution, annual interest rate, term and compounding frequency, then press Calculate.
Step 2 — Results
Your projection
- Total balance at end of period
- ﷼ 264,122.49
- Total contributions made
- ﷼ 130,000.00
- Total interest earned
- ﷼ 134,122.49
Balance growth by year
Figures are estimates based on the values you enter and a constant interest rate. Actual returns vary with market conditions, fees and taxes.
Save & compare
Save this calculation to compare offers side by side.
How This Calculator Works
Compound interest is the process of earning interest on both the money you originally saved and on the interest that money has already earned. It is the single most powerful force in long-term saving and investing, and the reason why even modest, steady contributions can grow into a meaningful sum over time.
Here is the idea in plain terms. When you deposit money into a savings account or investment, it earns a return. Leave that return in the account instead of withdrawing it, and the next period's interest is calculated on a larger balance — your original deposit plus everything it has earned so far. Each cycle, the base that earns interest gets a little bigger, so the amount of new interest gets a little bigger too. This feedback loop is what we call compounding.
This calculator lets you see that loop in action. Enter an initial deposit, a monthly contribution, an expected annual rate, a time horizon, and a compounding frequency, and it projects your future balance year by year. The math runs entirely in your browser, so you can adjust the numbers as often as you like and watch how small changes — a slightly higher rate, a few extra years, or a larger monthly contribution — translate into a noticeably larger balance.
How Compound Interest Is Calculated
The standard compound interest formula is:
- A — the final amount (your balance at the end)
- P — the principal (your starting deposit)
- r — the annual interest rate as a decimal (so 5% becomes 0.05)
- n — how many times per year interest is compounded
- t — the number of years
Worked example
If you deposit SAR 1,000 at a 5% annual rate, compounded monthly, for 10 years:
- 1.Monthly rate: r/n = 0.05 ÷ 12 = 0.004167
- 2.Number of compounding periods: n × t = 12 × 10 = 120
- 3.Growth factor: (1 + 0.004167)^120 ≈ 1.6470
- 4.Final amount: 1,000 × 1.6470 ≈ SAR 1,647.01
- 5.Interest earned: 1,647.01 − 1,000 = SAR 647.01
In other words, your money has grown by roughly 65% over ten years without you adding another riyal. When you also add a monthly contribution, the calculator applies the same compounding to each contribution from the moment it is deposited, which is why regular saving accelerates growth so dramatically.
Compounding Frequency: Why It Matters
Compounding frequency is how often the interest is calculated and added back to your balance. The more often it happens, the more chances your interest has to start earning its own interest. The difference is usually small in any single year, but it compounds over a long horizon.
Compare SAR 10,000 saved at 6% for 10 years under three frequencies:
- Annually (n = 1)SAR 17,908.47
- Monthly (n = 12)SAR 18,193.97
- Daily (n = 365)SAR 18,221.19
Moving from annual to monthly compounding adds about SAR 285 over the decade; moving from monthly to daily adds only another SAR 27. The first jump matters far more than the last, which is why frequency is worth checking but rarely worth chasing at the expense of a higher rate or lower fees.
Tips to Grow Your Savings Faster
- 1
Start as early as you can.
Time is the ingredient that makes compounding work. A person who saves SAR 500 a month from age 25 to 35 and then stops will often end up with more than someone who saves the same amount from 35 to 65, because the earlier money has longer to compound.
- 2
Increase your monthly contribution over time.
Even a small raise in your monthly deposit — say SAR 100 more — gets compounded for every remaining year, so its impact is much larger than the raw amount.
- 3
Choose the highest reliable yield you can find.
A 1% higher rate, sustained for decades, can add tens of thousands to a long-term balance. Compare accounts and watch for teaser rates that drop after a few months.
- 4
Leave the interest in the account.
Compounding only works if your earnings stay invested. Withdrawing interest each year turns compound interest back into simple interest and erases most of the long-term advantage.
- 5
Automate your contributions.
Setting up a standing transfer removes the temptation to skip a month and turns saving into a habit you do not have to think about.