Savings Growth Calculator — Compound Interest
Combine a starting balance, a monthly deposit and an expected annual return to project what you will have after any number of years. See at a glance how much of the final amount is your own money and how much is growth.
Savings Growth
Compound interest on your savings
How it works
- Interest compounds monthly on the running balance.
- Returns are nominal — inflation reduces real purchasing power.
- Time matters more than amount: starting 10 years earlier can double the outcome.
- Regular deposits smooth out market ups and downs when investing.
Worked example: €5,000 start, €200 a month, 5% for 20 years
- 1Own deposits: 5,000 + 200 × 12 × 20 = 53,000.
- 2Compound growth at 5% adds roughly 34,600.
- 3Final balance: about 87,600.
≈ €87,600 after 20 years (€53,000 deposited + €34,600 growth)
What €200 a month grows to
| Years | At 2% | At 5% | At 8% |
|---|---|---|---|
| 5 | €12,600 | €13,600 | €14,700 |
| 10 | €26,500 | €31,100 | €36,600 |
| 20 | €59,000 | €82,200 | €117,800 |
| 30 | €98,400 | €166,500 | €298,100 |
No starting balance, monthly compounding, rounded to hundreds. Investment returns are never guaranteed.
Frequently asked questions
What return rate should I assume?
Savings accounts typically pay 1–4%. Long-run stock-market averages are often modelled at 5–7% before inflation, but returns are never guaranteed.
What is compound interest?
Interest earned on your interest. Each month the return is calculated on the growing balance, not just your deposits, so growth accelerates over time.
Should I pay off debt before saving?
Usually yes when the debt's interest rate exceeds what savings earn. Clearing a 10% loan is a guaranteed 10% return; a savings account paying 3% cannot beat that.
How does inflation affect my savings?
If your money grows 4% while prices rise 2%, your real gain is about 2%. For long horizons, subtract expected inflation from the return to see the realistic outcome.
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