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Balance Daily Interest on a 365-Day Year Calculator

Estimate one day of simple interest from a balance and annual rate.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

A balance of 36,500 at an annual rate of 10% accrues 10 per day under a simple 365-day convention.

Daily interest = balance × annual rate ÷ 365

Worked example

Enter these known values and leave the other values blank.

Loan balance
36500 USD
Annual interest rate
10 %
Interest per day
10 USD
Interest rate per day
0.0274 %

Assumptions and limitations

  • It estimates one day on the balance entered. Repeatedly adding accrued interest changes future balances. Contract day-count rules, fees and rate changes are not modeled.
  • Use consistent periods, currency and accounting definitions. The result follows the stated formula and the figures you supply.

Common questions

Does this handle daily compounding?

It estimates one day on the balance entered. Repeatedly adding accrued interest changes future balances. Contract day-count rules, fees and rate changes are not modeled.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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