Closing Cost Formula Explained
The math behind the Closing Cost Calculator: the equation, the variables, and the assumptions it makes.
By Onias Derilus, Mortgage Capital · NMLS# 1859012 · Last Updated: June 2026
It estimates the one-time costs you pay at closing — lender fees, title charges, taxes, and prepaid escrow — on top of your down payment.
The Formula
Total closing costs ≈ lender fees + title + taxes + prepaids
Closing costs commonly run 2% to 5% of the purchase price. The mix shifts by loan type and price point, with title and government charges making up a large share in many transactions.
Prepaid items are not fees but money set aside in escrow — the first chunk of property taxes and insurance. The calculator separates true fees from prepaids so you can see where your money goes.
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Rates are illustrative only. APR and payments vary by credit score, loan amount, and market conditions. Subject to credit approval. Not a commitment to lend. NMLS# 1859012. Equal Housing Lender.