Daily Interest
Divide the annual rate by 365 for one day’s interest, then multiply by the days. Overdrafts, short deposits and late-payment charges all work this way.
Your numbers
Interest
36,986
Interest a day
822
Total
5,036,986
Formula
Interest = Principal × Annual rate ÷ 100 × Days ÷ 365
Products differ on whether the year is 365 or 360 days. A 360-day basis makes each day about 1.4% dearer.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| PrincipalThe money you put in — the base that earns interest. | 5,000,000 | 0 and up |
| Annual rate (%)Interest quoted per year; the monthly rate is this over 12. | 6 | 0 ~ 100 |
| Days (d)How many days interest runs for; multiply the daily figure by this. | 45 | 0 ~ 3,650 |
Step by step
Quick reference table
Results when only Principal changes and everything else stays put.
| Principal | Interest | Interest a day | Total |
|---|---|---|---|
| 2,500,000 | 18,493 | 411 | 2,518,493 |
| 3,750,000 | 27,740 | 616 | 3,777,740 |
| 5,000,000 | 36,986 | 822 | 5,036,986 |
| 7,500,000 | 55,479 | 1,233 | 7,555,479 |
| 10,000,000 | 73,973 | 1,644 | 10,073,973 |
What each result means
| Result | At default values |
|---|---|
| InterestThe interest earned or owed over the period. | 36,986 |
| Interest a dayInterest for a single day — the annual rate over 365. | 822 |
| TotalEvery item added together — check whether tax or tip is inside it. | 5,036,986 |
Common mistakes
Products differ on whether the year is 365 or 360 days. A 360-day basis makes each day about 1.4% dearer.
Glossary
- Principal
- The money you put in — the base that earns interest.
- Annual rate
- Interest quoted per year; the monthly rate is this over 12.
- Days
- How many days interest runs for; multiply the daily figure by this.
- Interest
- The interest earned or owed over the period.
- Interest a day
- Interest for a single day — the annual rate over 365.
- Total
- Every item added together — check whether tax or tip is inside it.
Frequently asked questions
Q. How is Daily Interest calculated?
Interest = Principal × Annual rate ÷ 100 × Days ÷ 365 — Divide the annual rate by 365 for one day’s interest, then multiply by the days. Overdrafts, short deposits and late-payment charges all work this way.
Q. Can you walk through an example?
With Principal 5,000,000, Annual rate 6%, Days 45d, the answer is Interest 36,986.
Q. What do I need to enter?
Enter Principal, Annual rate, Days. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Principal moves the answer to Principal 2,500,000 → Interest 18,493 and Principal 10,000,000 → Interest 73,973. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Products differ on whether the year is 365 or 360 days. A 360-day basis makes each day about 1.4% dearer.
Related calculators
Tax rates and interest conventions differ by country and product — check your contract for real transactions.