Sell House Calculator: How to Estimate Your Net Proceeds

Most sellers overestimate what they'll walk away with by 15–20% because they forget one or two line items — usually repair credits, the buyer-agent commission, or state transfer tax. A good sell house calculator fixes that by making every deduction explicit before you sign a listing agreement. The formula is short enough to memorize:

Net Proceeds = Sale Price − Mortgage Payoff − Closing Costs − Agent Commission − Repairs

That equation is the entire job of a sell house calculator. This guide walks through each input, models the math at $300k, $500k, and $800k, and shows how the numbers change when you compare a traditional sale to a cash offer. If you want a plug-and-play tool with your actual sale price, run it through the Opendoor home sale calculator — the math below will help you sanity-check whatever number it returns.

How a Sell House Calculator Works

Not every online calculator is measuring the same thing. There are really two flavors:

1. Net-proceeds calculators — what you actually walk away with after every deduction. This is what most sellers need.
2. Closing-cost calculators — only the fees section (title, escrow, transfer tax). Useful, but incomplete on its own because it ignores mortgage payoff, commission, and repairs.

If a tool asks only for sale price and closing-cost percentage, it's the second kind. That's fine for a rough fee estimate, but it will overstate your take-home by tens of thousands of dollars.

A useful sell house calculator asks for five inputs:

• Sale price
• Mortgage payoff (not balance)
• Closing costs
• Agent commission
• Repair credits or concessions

The single biggest source of error isn't math — it's the input values. Sellers routinely plug in their mortgage statement balance instead of a payoff quote, use last year's agent commission default (6%) when their listing agreement locked in 5%, or leave the repair line blank because "the home is in great shape." Every inspection finds something. Assume 1–2% of sale price for repair credits until you have an inspection report telling you otherwise.

The Net Proceeds Formula, Broken Down

Here's the equation again, in one line:

Net Proceeds = Sale Price − Mortgage Payoff − Closing Costs − Agent Commission − Repairs

Each input in plain English:

• Sale price — what the buyer pays. Usually less than list price after negotiation.
• Mortgage payoff — everything you still owe the lender at closing, including accrued interest and a small processing fee.
• Closing costs — seller-side fees paid at settlement (title, escrow, transfer tax, recording, attorney if applicable).
• Agent commission — total real estate commission, typically 5–6% and typically split between listing and buyer's agent.
• Repairs — credits the buyer negotiates after inspection, or work you agree to do before closing.

If any of these apply, subtract them too:

• Seller concessions toward buyer's closing costs
• Home warranty ($400–$700, if offered)
• HOA transfer or estoppel fees
• Prorated property taxes owed through your closing date
• Any second mortgage, HELOC, or judgment liens against the property

For the full breakdown of what sellers actually pay, see our complete guide to the cost of selling a house. This article stays focused on the formula and worked math.

Input Variables Explained

Sale price

The number you actually sell for, not what you list at. In a balanced market, homes close within 1–3% of list. In a slower market, expect 3–7% below.

Before you sign a listing agreement, pull three price estimates and use the middle one for your calculator:

1. A comparative market analysis (CMA) from a listing agent
2. Recent sold comps in your neighborhood (last 90 days, similar sq ft and beds)
3. An automated value estimate — for example, an estimate of your sale price from an online tool

If you get a cash offer from Opendoor, that number gives you a real-world data point: it's what a buyer with committed capital will pay this week, no financing contingency.

Mortgage payoff

Payoff is not the same as your statement balance. It includes:

• Principal balance
• Interest accrued from your last payment through the scheduled closing date
• A payoff processing fee, typically $30–$60
• Any prepayment penalty (rare, but check your loan documents)

Call your lender and request a written payoff quote — most will provide one good for 10–30 days. If you have a HELOC or second mortgage, get a payoff for that too. Both come out of your closing proceeds.

Closing costs (seller side)

Total seller closing costs run 1–3% of sale price in most markets, higher in states with transfer taxes (NY, PA, DE, MD, DC). See the breakdown table in the next section.

Agent commission

Historically 5–6% of sale price, split between the listing agent and the buyer's agent. Following the March 2024 National Association of Realtors settlement, buyer-agent commissions can no longer be advertised on the MLS and are separately negotiable — but in most competitive markets, sellers still offer one to attract offers.

Commission is negotiated when you sign the listing agreement, not at closing. Every point matters: on a $500,000 sale, moving from 6% to 5% saves $5,000.

Repairs and concessions

Inspection almost always turns up something. Buyers use those findings to negotiate credits at closing — HVAC servicing, minor roof repairs, a plumbing leak, radon mitigation, etc. On a typical home, expect 1–2% of sale price in repair credits. Older homes (pre-1980) can push 3%+.

For the full itemization, see our full breakdown of costs to sell a house.

Closing Cost Breakdown

Seller closing costs are the line items paid at settlement, separate from mortgage payoff and commission. Here's what typically appears on a seller's settlement statement:

Total: roughly 1–3% of sale price in most markets. High-tax states push toward the top of that range or beyond — New York City sellers routinely see 3–5% in fees alone, and Pennsylvania and Delaware run high on transfer tax.

The Bankrate seller closing cost calculator and the state-level guides on Realtor.com are useful cross-checks if you want a second opinion on the local ranges before running your own math.

Agent Commission — Why 5% vs 6% Matters

For decades the industry default was 6% total, split evenly (3% listing, 3% buyer-agent). The 2024 NAR settlement changed the mechanics — buyer-agent commissions are no longer posted on MLS and must be negotiated separately — but did not eliminate the practice. In most markets, sellers still cover the buyer's agent to keep their listing competitive.

Here's what the commission spread looks like in dollars:

That swing is real money. On a $500,000 home, negotiating from 6% to 5% is $5,000 in your pocket — often the difference between comfortably making a down payment on the next house and coming up short.

Practical guidance: negotiate commission before signing the listing agreement, not after. Flat-fee brokerages and discount brokers exist and can save real dollars, but they typically offer less service (fewer showings, weaker marketing, DIY paperwork). Get quotes from two or three agents and ask each one what's included at their proposed rate.

If commission is the biggest number you don't want to pay, a cash offer skips it entirely — no listing agent, no buyer's agent, no negotiation. That trade-off is quantified in the worked examples below.

Worked Examples at Three Price Points

Same assumptions across all three: 5.5% total commission, 2% closing costs, 1.5% repairs. The point is to show how proceeds scale with price — and how the Opendoor comparison changes at each tier.

$300,000 home

Trade-off: $11,100 less on the cash offer — but no showings, no repair negotiation, and a closing timeline you pick (often 14 days). At this price point the gap is real but narrow.

$500,000 home

Trade-off: $18,500 less on the cash offer. Certainty and speed against a mid-teens dollar gap.

$800,000 home

Trade-off: $29,600 less on the cash offer. The dollar gap widens at higher price points because commission and repair savings don't scale as fast as absolute price does.

Capital Gains Tax — What the Calculator Doesn't Show

Capital gains tax isn't a closing-day deduction. It hits you at tax time, not at settlement — so a sell house calculator won't subtract it from your net proceeds. That doesn't mean you can ignore it.

The IRS Section 121 exclusion means the first $250,000 of gain ($500,000 married filing jointly) is tax-free if the home was your primary residence for at least 2 of the last 5 years. For most owner-occupants, that exclusion covers the entire gain.

Quick example: you bought at $250,000, you sell at $500,000. That's $250,000 in gain. A single filer under the exclusion owes nothing. A married couple filing jointly is well under the $500,000 threshold — also nothing.

Where it gets expensive:

• Investment properties (no exclusion — full gain is taxable at long-term capital gains rates, typically 15–20% federal, plus state)
• Homes you owned but didn't live in for 2 of the last 5 years
• Gains above the exclusion (e.g., $700,000 gain on a primary residence held jointly: first $500,000 is exempt, remaining $200,000 is taxed at 15–20% federal)

For the full picture, read our guide to capital gains when selling your house.

Sell House Calculator vs. Cash Offer — Which Number Matters?

A traditional-sale calculator shows gross-of-time-and-hassle proceeds. It assumes you list, show, negotiate, inspect, repair, and close in 60–90 days — and that nothing goes wrong. The number it produces is the ceiling.

A cash offer shows net-of-hassle proceeds today. Lower headline number, higher certainty, no financing contingency, and a close date you pick.

The right question isn't "which number is bigger?" — it's "how much is 60–90 days of my time, and the risk of the deal falling through, worth to me?" For a seller who's already bought their next house, that time has a dollar value. For a seller who's flexible and can wait for peak market conditions, the traditional route usually wins on paper.

Run both. The Opendoor home sale calculator gives you a real cash offer and a side-by-side estimate of what you'd net on the open market. Comparing two real numbers beats guessing.

Common Mistakes When Using a Sell House Calculator

Five mistakes account for most bad estimates:

1. Using mortgage balance instead of payoff quote. Balance is what you owe today; payoff includes interest through closing plus fees. On a $300,000 balance, the difference is usually $1,000–$3,000.
2. Forgetting the buyer-agent commission. Post-NAR settlement, many sellers assume it's gone. In practice, most sellers in competitive markets still offer 2.5–3% to attract buyer-agent-represented offers.
3. Ignoring repair credits. Every inspection finds something. Budget 1–2% until you know otherwise.
4. Missing state transfer tax. New York, Delaware, Pennsylvania, Maryland, and DC all have meaningful transfer taxes. In NYC, combined city and state transfer tax can hit 2.075%+ on higher-price sales.
5. Assuming full IRS Section 121 exclusion without meeting the residency test. You need to have lived in the home for 2 of the last 5 years. Vacation homes and short-term flips don't qualify.

A calculator is only as accurate as the numbers you feed it. Get a payoff quote, ask your agent for a fee estimate, and add a repair line even if your home shows well — then adjust as inspection results come in. For state-by-state estimates, Zillow's seller calculator is a decent cross-check.

Get Your Real Number in Minutes

The formula gets you a defensible estimate. The math is memorizable: sale price minus payoff minus closing costs minus commission minus repairs. Plug in real inputs — not defaults, not statement balances, not "the house is perfect so skip the repair line" — and you'll be within a few thousand dollars of your actual take-home.

Numbers get real once you have a specific offer. Opendoor's home sale calculator is free, takes about a minute, and returns a competitive cash offer alongside a side-by-side view of what you'd likely net on the open market. Run both — comparing two real numbers is faster and more useful than guessing at one.