Construction Loan Calculator
Estimate monthly payments and total interest for a construction loan. Input loan amount, interest rate, and construction period.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Construction Loan Calculator
This calculator estimates your monthly payment, total interest, and total cost for a construction loan. Follow these steps:
- Enter Loan Amount ($) – The total amount you plan to borrow (e.g., 200,000). Must be greater than 0.
- Enter Annual Interest Rate (%) – The yearly interest rate (e.g., 6.5 for 6.5%). Must be greater than 0.
- Enter Construction Period (months) – The loan term in months (e.g., 12 for 1 year). Must be at least 1.
- Enter Down Payment ($) – Any upfront payment you make (e.g., 40,000). Can be 0, but must be less than the loan amount.
- Click Calculate to see results.
Results:
- Monthly Payment – Fixed payment each month based on the principal (loan minus down payment), interest rate, and term.
- Total Interest – Total interest paid over the loan period.
- Total Cost – Sum of all payments plus the down payment.
Note: All inputs must be positive numbers. The calculator uses the standard amortization formula with monthly compounding.
Previous Results
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Frequently Asked Questions
The calculator uses the standard amortization formula: M = P * [r(1+r)^n] / [(1+r)^n - 1], where P is the principal (loan amount minus down payment), r is the monthly interest rate (annual rate divided by 12), and n is the number of months.
You need the total loan amount, annual interest rate, construction period in months, and any down payment. All fields are required except down payment (defaults to 0).
Yes, this calculator works for any construction or renovation loan with a fixed interest rate and fixed term.
