Construction Loan Interest Calculator

Estimate interest paid during the construction phase.

Cross-check your specs, drawings, and addenda for gaps.

BidFlow reads the spec book, the drawings, and every addendum against your bid, then shows you the scope nobody covered. Catch it before you send the number, not after you sign.

Try it on your bid Book a demo

New Funds Needed for Construction ($):

Annual Interest Rate (%)

Construction Period (Months)

Do you own this property? (Is this a refinance?)

Amount you owe on home:

If refinancing, interest will be estimated on the sum of new funds and this amount owed.

Interest Calculation Method

Choose how to estimate interest:
• Gradual Draws (Typical Estimate): Assumes funds are drawn steadily throughout construction. We estimate interest based on an average outstanding balance of 50% of the total loan. This is a common approximation.
• All Funds Upfront (Max Interest Estimate): Calculates interest as if the entire loan amount is disbursed and accrues interest from day one. This will show a higher interest cost and can be useful for a conservative estimate.

Estimate Summary

Total Interest Paid--

Average Monthly Interest--

By BidFlow Editorial