Construction Loan Calculator
Calculate Construction Loan
Use our Construction Loan Calculator to estimate monthly payments and total costs for construction loans, including both the construction phase and permanent financing. Plan your building project budget with accurate payment calculations.
How Construction Loan Calculator Works
This calculator helps you estimate monthly payments and total costs for construction loans, including both the construction phase and permanent financing.
Formula Used:
Monthly Payment Calculation:
P = L[c(1 + c)^n]/[(1 + c)^n - 1]
Where:
- • P = Monthly payment
- • L = Loan amount
- • c = Monthly interest rate (annual rate / 12)
- • n = Total number of payments
Key Components:
- • Construction Phase: Interest-only payments during building
- • Permanent Phase: Full principal and interest payments
- • Down Payment: Typically 20-25% of total project cost
- • Interest Rates: Usually higher than traditional mortgages
Important Considerations:
- • Construction loans have variable rates
- • You'll need detailed construction plans
- • Lenders require qualified contractors
- • Budget for cost overruns (10-15% buffer)
- • Plan for the conversion to permanent financing
Construction Loan Process:
- • Application: Submit detailed plans and contractor information
- • Approval: Lender reviews project feasibility and borrower qualifications
- • Draw Schedule: Funds released in stages as construction progresses
- • Inspections: Required before each draw to verify completion
- • Conversion: Convert to permanent mortgage upon completion
Cite this page as:
Daniel, P. Construction Loan Calculator. Available at: https://constructioncalculators.com/construction-loan-calculator/. Accessed: October 25, 2026.