House Flip Calculator

Underwrite the flip before you make the offer.

Estimate acquisition costs, rehab line items, hard-money financing, holding costs, resale costs, profit, ROI, annualized return, break-even sale price, capital required, and 70% rule offer math.

Deal Inputs

Build the offer from the full project stack, not just purchase price minus ARV.

Property

Address and size

Property address Interior size (sq ft) Target purchase date

Loan Information

Hard money or private lending

Amount borrowed Annual interest rate % Points % Repayment mode Origination / lender fees Other loan costs

Purchase Costs

Acquisition basis

Purchase price Finder / assignment fee Other acquisition costs Inspections Buyer closing costs Purchase price per sq ft

Repair Estimator

Enter quantity and unit cost. Add custom rows for anything not listed.

Qty

Repair Item

Unit Cost

Project Cost

Total repair estimate $0

Repair Costs

Override and contingency

Override repair estimate Contingency % Total repair costs

Holding Costs

Timeline and monthly burn

Rehab months Listing / escrow months Annual property tax % Monthly utilities Monthly insurance HOA / other monthly costs Estimated list date Estimated final COE Total monthly costs

Selling Costs

ARV and disposition

Sales price / ARV Listing commission % Buyer agent commission % Staging / prep Seller closing costs Other sale costs Sales price per sq ft Total selling proceeds

How to use the House Flip Calculator

Use conservative inputs first, then stress the repair budget and timeline. Confirm estimates with your lender, contractor, agent, title company, inspector, and local market data before making an offer.

Start with ARV discipline

Enter a resale price supported by recent comparable sales, not the number needed to make the deal work.

Budget repairs line by line

The repair table helps separate real scope from a single optimistic allowance.

Watch the timeline

Interest, taxes, insurance, utilities, and delays can quietly erase margin.