Daily Compound Interest Calculator
Interest added every day — 365 times a year. Adjust the inputs to see the year-by-year effect.
Year-by-Year Breakdown
| Year | Starting Balance | Contributions | Interest Earned | Ending Balance |
|---|---|---|---|---|
| 1 | $10,000 | $6,000 | $1,058 | $17,058 |
| 2 | $17,058 | $6,000 | $1,646 | $24,705 |
| 3 | $24,705 | $6,000 | $2,283 | $32,988 |
| 4 | $32,988 | $6,000 | $2,973 | $41,961 |
| 5 | $41,961 | $6,000 | $3,720 | $51,681 |
| 6 | $51,681 | $6,000 | $4,530 | $62,210 |
| 7 | $62,210 | $6,000 | $5,406 | $73,617 |
| 8 | $73,617 | $6,000 | $6,356 | $85,973 |
| 9 | $85,973 | $6,000 | $7,385 | $99,358 |
| 10 | $99,358 | $6,000 | $8,500 | $113,858 |
| 11 | $113,858 | $6,000 | $9,708 | $129,566 |
| 12 | $129,566 | $6,000 | $11,016 | $146,582 |
| 13 | $146,582 | $6,000 | $12,433 | $165,014 |
| 14 | $165,014 | $6,000 | $13,968 | $184,982 |
| 15 | $184,982 | $6,000 | $15,631 | $206,613 |
| 16 | $206,613 | $6,000 | $17,432 | $230,045 |
| 17 | $230,045 | $6,000 | $19,383 | $255,428 |
| 18 | $255,428 | $6,000 | $21,497 | $282,925 |
| 19 | $282,925 | $6,000 | $23,787 | $312,712 |
| 20 | $312,712 | $6,000 | $26,268 | $344,979 |
| 21 | $344,979 | $6,000 | $28,955 | $379,934 |
| 22 | $379,934 | $6,000 | $31,866 | $417,800 |
| 23 | $417,800 | $6,000 | $35,019 | $458,819 |
| 24 | $458,819 | $6,000 | $38,435 | $503,254 |
| 25 | $503,254 | $6,000 | $42,135 | $551,390 |
| 26 | $551,390 | $6,000 | $46,144 | $603,534 |
| 27 | $603,534 | $6,000 | $50,487 | $660,020 |
| 28 | $660,020 | $6,000 | $55,191 | $721,211 |
| 29 | $721,211 | $6,000 | $60,286 | $787,497 |
| 30 | $787,497 | $6,000 | $65,807 | $859,304 |
| Total | — | $190,000 | $669,304 | $859,304 |
How much does daily compounding really change?
Daily compounding sounds dramatically better than annual, but on $10,000 at 5% over ten years it is worth about $198 — roughly 1.2% more. The rate you get matters far more than how often it compounds.
The table below holds everything constant — $10,000 at 5% for 10 years, no contributions — and varies only the compounding cadence.
| Frequency | Times / year | Final balance | vs annual |
|---|---|---|---|
| Daily (this page) | 365 | $16,486.65 | +$197.70 |
| Weekly | 52 | $16,483.25 | +$194.31 |
| Monthly | 12 | $16,470.09 | +$181.15 |
| Quarterly | 4 | $16,436.19 | +$147.25 |
| Annual | 1 | $16,288.95 | — |
The spread across every cadence is $197.70 — under 1.2% of the balance. Raising the rate by a quarter of a point, or adding a small monthly contribution, moves the result far more than any change of frequency. Try it in the calculator above.
Where you meet daily compounding
Most savings accounts, money-market accounts, and high-yield online banks compound daily and credit the interest monthly. Credit-card interest also accrues daily, which is the same mechanism working against you.
Other compounding frequencies
Related Calculators
Frequently Asked Questions
- Interest is calculated and added to your balance every day — 365 times a year. From the next period onward you earn interest on that interest too. Most savings accounts, money-market accounts, and high-yield online banks compound daily and credit the interest monthly. Credit-card interest also accrues daily, which is the same mechanism working against you.