Construction Loan Draw Calculator

Background.

The practical question behind Construction Loan Draw Calculator is whether you can sum simple interest by draw amount and months outstanding to estimate an interest reserve. In this context, construction interest accrues only after each advance, so a staged draw schedule costs less than funding the full commitment on day one. The calculator therefore applies “interest reserve = Σ(draw amount × annual rate × months outstanding ÷ 12).”

The editable entries are first draw, months first draw is outstanding, second draw, months second draw is outstanding, third draw, months third draw is outstanding, annual interest rate. Use values from the document or measurement that governs this construction loan draw question; the defaults are only the worked fixture below. Actual lenders use dates, daily balances, inspection timing, retainage and changing rates; month buckets are an estimate. That construction loan draw boundary is part of the answer, not a generic disclaimer.

Consumer Financial Protection Bureau, Loan Estimate explainer; rate, payment and closing-cost fields documents the convention or governing rule used here. The construction loan draw output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is construction loan draw calculator?

Construction Loan Draw is the relationship behind this decision: construction interest accrues only after each advance, so a staged draw schedule costs less than funding the full commitment on day one. On this page it means interest reserve = Σ(draw amount × annual rate × months outstanding ÷ 12). Actual lenders use dates, daily balances, inspection timing, retainage and changing rates; month buckets are an estimate; that is the line between the reported quantity and a broader mortgage analysis.

How to use this calculator.

1. 01Confirm that “interest reserve = Σ(draw amount × annual rate × months outstanding ÷ 12)” matches the construction loan draw convention you need.
2. 02Replace the fixture values for first draw, months first draw is outstanding, second draw, months second draw is outstanding, third draw, months third draw is outstanding, annual interest rate with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read total interest reserve together with this boundary: Actual lenders use dates, daily balances, inspection timing, retainage and changing rates; month buckets are an estimate.

The formula.

The calculation uses interest reserve = Σ(draw amount × annual rate × months outstanding ÷ 12). In this construction loan draw model, the entered terms are first draw, months first draw is outstanding, second draw, months second draw is outstanding, third draw, months third draw is outstanding, annual interest rate. Construction interest accrues only after each advance, so a staged draw schedule costs less than funding the full commitment on day one, which is why the relationship is presented under this name rather than as a universal alternative. Actual lenders use dates, daily balances, inspection timing, retainage and changing rates; month buckets are an estimate. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Consumer Financial Protection Bureau, Loan Estimate explainer; rate, payment and closing-cost fields. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]Fannie Mae. Single family selling guide. Retrieved 2026-08-07. independence: primary; access: open.
3. [3]International Code Council. 2024 International Residential Code (IRC). Retrieved 2026-08-07. independence: primary; access: open.