Mortgage calculator

Estimate principal, interest and housing costs together.

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Mortgage calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Home price

Down payment

More inputs and assumptions

Annual nominal interest (%)

Term (years)

Annual property tax

Annual insurance

Monthly other housing costs

Answer

…

Borrowed principal = price − down payment. Calculate a fixed monthly loan payment, then add annual property tax and insurance divided by 12, plus other monthly costs.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Mortgage calculator

Borrowed principal = price − down payment. Calculate a fixed monthly loan payment, then add annual property tax and insurance divided by 12, plus other monthly costs.

Next: Auto loan calculator

A worked example

With home price = 300000, down payment = 60000, annual nominal interest (%) = 6, term (years) = 30, annual property tax = 3000, annual insurance = 1200, monthly other housing costs = 0, the estimated monthly total is 1,788.92 (rounded to two decimal places).

Next: Calculate DTI

Before you use the result

Assumes monthly compounding and fixed-rate end-of-month payments. Include HOA fees or mortgage insurance in other costs when applicable. Closing costs and changing escrow amounts are excluded; this is not a loan offer. Calculations keep full browser-number precision. Money amounts are displayed to two decimal places; other results use up to 12 significant digits. Very large values may lose precision.

Example results for home price

These examples use Down payment: 60000; Annual nominal interest (%): 6; Term (years): 30; Annual property tax: 3000; Annual insurance: 1200; Monthly other housing costs: 0. They are reference calculations, not recommended settings.

Home price	Estimated monthly total
150000	889.60
300000	1,788.92
600000	3,587.57

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