Enter project and debt details
Optional income fields add a debt service coverage check.
Formula used
Total Cost = Base Cost + Soft Costs + Other Costs + (Base Cost × Contingency Rate)Cost to Debt Ratio = Total Cost ÷ Debt FinancingDebt to Cost (%) = (Debt Financing ÷ Total Cost) × 100Equity Required = max(0, Total Cost − Debt Financing)
The ratio is displayed as cost for every one unit of debt. A 1.50:1 result means each debt unit supports 1.50 units of calculated project cost.
How to use this calculator
- Enter the main project cost first.
- Add soft and other costs when they apply.
- Set the contingency percentage for the base cost.
- Enter the full debt financing amount.
- Choose a target debt share for comparison.
- Add annual income and debt service for coverage analysis.
- Select a currency and precision, then calculate.
- Review the ratio, equity need, and funding position.
Using cost and debt information wisely
What the ratio measures
A cost-to-debt ratio compares the full estimated cost with debt financing. It shows how much total cost exists for each unit of borrowing. The companion debt-to-cost percentage shows the same relationship in percentage form. Together, these figures describe the funding mix. They do not measure profitability by themselves.
A ratio above 1.00:1 means total cost is larger than debt. The gap normally requires equity, grants, retained cash, or other funding. A ratio at 1.00:1 means debt matches calculated cost. A ratio below 1.00:1 indicates debt exceeds the entered cost. Check the project scope before relying on that result.
Why the inputs matter
Small missing costs can change the funding picture. Soft costs often include design, permits, legal work, insurance, and lender fees. Other costs may include equipment, reserves, taxes, or closing expenses. Contingency protects the estimate from known uncertainty. Keeping these items separate makes the calculation easier to audit.
Debt should represent the financing committed or planned for the same cost scope. Do not mix a loan amount for one phase with costs from several phases. Use one currency throughout the estimate. The currency selector only changes symbols. It does not convert any value.
How to read leverage
Higher debt-to-cost percentages can preserve cash for other needs. They can also increase payment pressure and lender scrutiny. Lower percentages require more equity but may reduce leverage risk. The right balance depends on cash flow, collateral, loan terms, project timing, and the lender's requirements.
The optional debt service coverage result adds another useful view. It divides annual income by annual debt service. A value above 1.00x means entered income is greater than the entered yearly payment. This is only a screening measure. Real underwriting may adjust income, expenses, reserves, and debt service.
Build stronger scenarios
Run several cases instead of relying on one estimate. Start with expected costs. Then test a higher contingency rate. Test lower debt, higher debt, and different target shares. Compare the resulting equity requirement each time. This approach highlights where funding gaps may appear before commitments are final.
Use the target debt share as a planning benchmark, not a lending promise. A positive target difference means your selected target allows more debt than the amount entered. A negative difference means current debt exceeds that target. Review the numbers with a qualified financial professional before signing financing documents.
Keep dated versions of each scenario. Record assumptions behind every figure. Note whether costs are fixed, quoted, estimated, or subject to escalation. Revisit calculations when schedules move, rates change, or scope expands. A ratio is most useful when the source budget remains current. Regular updates create clearer records for partners, advisers, and decision makers. They make financing conversations easier to explain and compare confidently. This discipline supports faster, better-informed funding decisions overall.
Example funding data
| Input | Example value | Purpose |
|---|---|---|
| Base project cost | $800,000 | Main expected project expenditure. |
| Soft costs | $70,000 | Fees, design, permits, and services. |
| Other costs | $30,000 | Reserves and additional project needs. |
| Contingency | 5% | Adds $40,000 to the base estimate. |
| Debt financing | $630,000 | Planned loan amount. |
| Calculated outcome | 1.49 : 1 | Total cost is $940,000, requiring $310,000 equity. |
Frequently asked questions
What is a cost-to-debt ratio?
It divides total calculated cost by debt financing. The result shows how much cost exists for every one unit of debt. It is useful for reviewing a project's funding mix.
Is cost-to-debt the same as debt-to-cost?
They show the same relationship from opposite directions. Cost-to-debt is usually a ratio. Debt-to-cost is usually expressed as a percentage of total cost financed by debt.
What does a 1.50:1 result mean?
It means the project has 1.50 units of calculated cost for every one unit of debt. The difference typically needs equity or another source of funding.
Should contingency be included?
Usually, yes. A realistic funding plan should include a suitable contingency. This calculator applies the entered contingency rate only to base project cost.
What counts as soft costs?
Soft costs can include professional fees, permits, insurance, legal work, financing fees, and planning expenses. Classify them consistently with your project budget.
Why does the calculator show equity required?
Equity required is the remaining gap after debt financing. It equals total calculated cost minus debt, but never displays a negative equity requirement.
What happens when debt exceeds total cost?
The calculator marks the result as overfunded. Recheck project costs, debt scope, and timing. Extra borrowing may be intended, but it should be reviewed carefully.
What is the target debt difference?
It compares your debt amount with debt implied by the selected target debt share. A positive amount indicates room under the target. A negative amount indicates you are above it.
How is debt service coverage calculated?
When optional annual values are entered, coverage equals annual net operating income divided by annual debt service. It is a simple planning estimate, not a lender decision.
Does currency selection convert values?
No. It changes the display symbol only. Enter all costs, debt, income, and payments in the same currency before calculating.
Can I use this for personal debt?
Yes, for a broad funding review. Enter the relevant total cost and debt amount. For personal lending choices, consider your interest rate, repayment schedule, and emergency savings too.