Investment Tools
Invest Tools
Compound interest is time's most powerful force. Enter your principal and contributions to see the real numbers 10, 20, or 30 years from now.
📈 Compound Interest Calculator
Enter principal, contributions, and return rate to simulate asset growth
× NT$10K
1萬100 × NT$10K1億
× NT$10K
03 × NT$10K100萬
Can be 0 for principal-only simulation
%
0.1%7.0%30%
Final Amount
NT$ 2.00M
Total Principal InvestedNT$ 8,200,000
Total Interest EarnedNT$ 1.20M
Return Multiple2.41x
Principal 41.5%Interest 58.5%
📊 Yearly Asset Growth
| Year | Total Principal Invested | Total Interest Earned | Total |
|---|---|---|---|
| 1 | NT$ 1,360,000 | NT$ 86,236 | NT$ 1,446,236 |
| 2 | NT$ 1,720,000 | NT$ 204,731 | NT$ 1,924,731 |
| 3 | NT$ 2,080,000 | NT$ 357,816 | NT$ 2,437,816 |
| 4 | NT$ 2,440,000 | NT$ 547,993 | NT$ 2,987,993 |
| 5 | NT$ 2,800,000 | NT$ 777,941 | NT$ 3,577,941 |
| 6 | NT$ 3,160,000 | NT$ 1,050,537 | NT$ 4,210,537 |
| 7 | NT$ 3,520,000 | NT$ 1,368,863 | NT$ 4,888,863 |
| 8 | NT$ 3,880,000 | NT$ 1,736,226 | NT$ 5,616,226 |
| 9 | NT$ 4,240,000 | NT$ 2,156,170 | NT$ 6,396,170 |
| 10 | NT$ 4,600,000 | NT$ 2,632,495 | NT$ 7,232,495 |
| 11 | NT$ 4,960,000 | NT$ 3,169,279 | NT$ 8,129,279 |
| 12 | NT$ 5,320,000 | NT$ 3,770,892 | NT$ 9,090,892 |
| 13 | NT$ 5,680,000 | NT$ 4,442,019 | NT$ 1.00M |
| 14 | NT$ 6,040,000 | NT$ 5,187,687 | NT$ 1.10M |
| 15 | NT$ 6,400,000 | NT$ 6,013,284 | NT$ 1.20M |
| 16 | NT$ 6,760,000 | NT$ 6,924,588 | NT$ 1.40M |
| 17 | NT$ 7,120,000 | NT$ 7,927,794 | NT$ 1.50M |
| 18 | NT$ 7,480,000 | NT$ 9,029,546 | NT$ 1.70M |
| 19 | NT$ 7,840,000 | NT$ 1.00M | NT$ 1.80M |
| 20 | NT$ 8,200,000 | NT$ 1.20M | NT$ 2.00M |
Key Concepts
Why Compound Interest Matters
📐
The Rule of 72
Divide 72 by your annual return to estimate how many years it takes to double your money. At 7%, it doubles in ~10 years. At 10%, just ~7 years.
⏳
Time is Your Biggest Edge
NT$1M invested for 30 years at 7% annual return becomes ~NT$7.6M. The growth is slow at first — but explosive in the final years.
💡
Regular Contributions Multiply the Effect
Adding NT$30K/month for 20 years gives you NT$7.2M in total principal. At 7% annual return, that grows to ~NT$18M. Consistent investing changes everything.