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Margin Loan 360-Day Interest Calculator

Estimate simple margin interest using a 360-day year.

  • 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

For a constant 10,000 balance at 12% annually over 30 days, the 360-day convention gives interest of 100.

Interest = balance × annual rate × days ÷ 360

Worked example

Enter these known values and leave the other values blank.

Amount borrowed
10000 USD
Interest rate
12 %
Number of days
30 days
Margin interest
100 USD

Assumptions and limitations

  • It applies simple interest on a constant balance with a 360-day year. Your agreement may use a different day count, changing daily balances, tiered rates or other charges.
  • Use consistent periods, currency and accounting definitions. The result follows the stated formula and the figures you supply.

Common questions

Will this match every broker’s charge?

It applies simple interest on a constant balance with a 360-day year. Your agreement may use a different day count, changing daily balances, tiered rates or other charges.

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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