Price per sqft calculator
A home sold for 450,000 with 1,800 square feet of interior floor works out to 250 per square foot, a single figure you can line up against nearby sales of any size. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Sale price
- 450,000
- Floor area
- 1,800
- Price per sqft
- 250 per_sqft
Price per square foot is the unit price buyers, sellers, and appraisers use to compare properties of different sizes. Divide the sale price by the interior floor area in square feet and you get a single number you can stack against comps on the same street, in the same building, or across a whole market.
What price per square foot means and how the unit price is formed
Price per square foot is the sale price of a property divided by its interior floor area measured in square feet. That ratio is the language of listing remarks, comparative market analyses, and investment memos because a four-hundred-thousand bungalow and a seven-hundred-thousand loft cannot be ranked by sticker alone.
A house listed at four hundred fifty thousand with one thousand eight hundred square feet of finished floor is two hundred fifty per square foot; a smaller condo at three hundred seventy-five thousand with one thousand two hundred fifty square feet is three hundred per square foot even though the ticket is lower. There is no hidden closing-cost adder, no lot-size mix-in, no garage or patio credit, and no currency conversion.
Floor area must be a strictly positive number of square feet: zero living area would be division by zero, and a negative floor area is not a physical dwelling. Sale price must be a finite amount greater than or equal to zero, so a gifted transfer at zero still yields a well-defined unit price of zero, while a negative listing is rejected as not a sale.
If you need price per square meter, land-only value, or a rent roll, use a dedicated converter or income tool; this page answers only the sale-over-floor-area unit price.
Where a price-per-square-foot calculator earns its keep
Home shoppers use price per square foot to compare a compact townhouse with a sprawling ranch without being misled by the larger sticker on the bigger floor plan. Listing agents and comparative-market-analysis writers need a reproducible unit price from the asking or closed sale and the stated living area so comps on the same block share one ground truth instead of a spreadsheet cell that silently used lot size.
Investors underwriting a small multifamily or a warehouse look at unit price before they look at cap rate, because a building that is expensive per square foot needs stronger rent to justify the basis. Failed validation does not consume balance. Keep requests small, pin the rounded unit price in tests, and you get stable price-per-sqft math for widgets, listing checkers, and edge workers without standing up a full valuation stack of your own.
What you can do with it
Compare listings of different sizes
Divide each asking price by living area so a small condo and a large house can be ranked on the same per-square-foot scale.
Investment underwriting inputs
Feed sale price and floor area into scripts that need a stable unit price before cap-rate, rent, or renovation math runs.
FAQ
What units should I use for floor area?
Use interior floor area in square feet (heated or stated living area as your listing defines it). Do not mix lot acres or square meters in the same request unless you convert first.
Does this include land, garage, or outdoor space?
No. The calculator only divides the sale price you supply by the floor area you supply.
Why compare homes by price per square foot instead of total price?
Because a bigger home almost always carries a bigger total. Dividing by floor area puts a compact townhouse and a sprawling ranch on the same scale, and the smaller home can turn out dearer per square foot.
What happens if the floor area is zero or negative?
The calculator rejects it. A zero floor area would mean dividing by zero, and a negative one is not a real home. The sale price, by contrast, may be zero, which gives a unit price of zero.
Can I get the price per square meter here?
No, this page divides only by square feet. For a price per square meter, use the dedicated price-per-square-meter calculator, which works directly with metric floor areas.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/fin/price-per-sqft \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"sale_price":450000,"floor_area":1800}'const res = await fetch("https://api.kit.forhosting.com/fin/price-per-sqft", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"sale_price": 450000,
"floor_area": 1800
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/fin/price-per-sqft",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"sale_price": 450000,
"floor_area": 1800
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/fin/price-per-sqft", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"sale_price":450000,"floor_area":1800}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"sale_price":450000,"floor_area":1800}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/fin/price-per-sqft", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"sale_price": 450000,
"floor_area": 1800
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "fin.price_per_sqft",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_sale_price | 1000000000000000 |
max_floor_area | 1000000000000 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
This calculator accepts a sale_price and a floor_area, returns price_per_sqft, and rejects a floor area that is not a positive number because a zero or negative living area cannot produce a real unit price. Successful API calls cost $0.002; invalid input is not billed.
What price per square foot means and how the unit price is formed
The formula this endpoint applies is exactly that classroom identity: price_per_sqft equals sale_price divided by floor_area. The engine either divides two finite numbers inside the documented ceilings or fails with invalid_input. Results round sale_price to two decimal places for currency display and round floor_area and price_per_sqft to six decimal places so goldens and JSON clients stay stable across runtimes.
Input contract, aliases, rounding, and error behaviour
POST a JSON body with two required fields. sale_price is the property sale or listing price in currency units and must be a finite number greater than or equal to zero; aliases price, amount, listing_price, purchase_price, and cost are accepted so spreadsheets and listing feeds can reuse the same contract. floor_area is the interior floor area in square feet and must be a finite number strictly greater than zero; aliases area, sqft, square_feet, floor_sqft, living_area, and sq_ft are accepted. Each field may arrive as a JSON number or as a numeric decimal string, including optional leading plus signs and scientific notation that parse as finite values. Missing fields, empty strings, non-numeric tokens, infinities, and magnitudes above the documented ceilings fail with invalid_input naming the problem and are not billed. The distinctive failure the product promises is a floor area that is not a positive number: zero, a negative living area, or a value at or below a tiny epsilon is rejected because price per square foot is sale_price divided by floor_area and that quotient is undefined when floor area is zero or negative. On success the body echoes the normalized sale_price and floor_area, returns price_per_sqft as the unit price, tags unit as per_sqft, and restates the formula string so clients can print the identity next to the number. Pair the free browser run on this page with the priced API when you need the identical mathematical result inside an automated pipeline without re-implementing the division yourself.
Where a price-per-square-foot calculator earns its keep
Appraisers and assessors batch many sale_price and floor_area pairs when they build a grid of recent sales; a tiny parse API is cheaper and more deterministic than a spreadsheet macro that might mix heated area with garage area. Classroom personal-finance lessons and real-estate exam prep need an oracle that rejects a zero or negative floor area as invalid_input rather than inventing infinity.
Integration use cases
Appraisal and comparative market analysis
Turn closed sales and stated floor areas into a reproducible price_per_sqft grid for comps, CMA packets, and assessor worksheets.
Technical questions
How is price per square foot calculated?
price_per_sqft = sale_price / floor_area. Send a non-negative sale price and a strictly positive floor area in square feet; the API returns the unit price.
What happens if floor area is zero or negative?
The task fails with invalid_input. Floor area must be a positive number; price per square foot is undefined when living area is zero or negative, and the call is not billed.
What does the price per square foot calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.