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Interest-Bearing Debt as a Share of Capital

Calculate debt divided by debt plus equity, with nonnegative inputs and explicit zero-debt and zero-equity boundaries.

Formula & worked example
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How to use this calculator

Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
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

Interest-bearing debt of 300 and equity of 700 give a debt-to-capital ratio of 0.3, equivalent to 30%.

Debt-to-capital ratio = debt ÷ (debt + equity)

Worked example

Enter these known values and leave the other values blank.

Interest-bearing debt: 300 USD
Equity: 700 USD

Debt share as a decimal ratio: 0.3

Assumptions and limitations

Debt and equity are nonnegative and their sum must be positive. Negative-equity cases are outside this model.
The result is a decimal ratio: 0.3 means 30%, not 0.3%. Use matching valuation dates and a consistent basis.
A zero-debt company with positive equity gives zero; debt with zero equity gives one. Neither boundary uniquely determines the unknown capital amount from the ratio alone.

Common questions

Does a ratio above 0.5 mean equity is negative?

No. With nonnegative debt and equity, it simply means debt exceeds equity.

Is debt-to-capital the same as debt-to-equity?

No. The former divides by debt plus equity; the latter divides only by equity.

References

Bookify permits zero debt or zero equity, while requiring positive total capital and a ratio from zero through one.

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