Property Tax Calculator — Assessed Value & Millage Rate
Estimate annual property tax from your home’s market value, assessment ratio, exemptions, and local millage rate. Free, in-browser, US-focused.
About Property Tax Calculator
A property tax calculator is a tool that estimates the annual property tax on a home by multiplying its taxable assessed value by the local tax rate, usually expressed in mills. The assessed value is derived from market value times an assessment ratio, then reduced by any homestead or other exemptions. Because a mill is one-tenth of a percent, a 20-mill rate equals 2 percent of taxable value. Rates, ratios, and exemptions are set locally and vary widely from one county or town to the next, so this tool is a starting estimate rather than a bill. It runs entirely in your browser and is not tax advice — it cannot know your specific jurisdiction’s rate, special assessments, or the outcome of any appeal.
Use cases
- Budget for a home you’re considering. When shopping for a house, property tax can add hundreds of dollars to a monthly payment beyond principal and interest. Plugging in a listing’s asking price, a rough assessment ratio, and the area’s millage rate gives an annual estimate you can divide by twelve to fold into your budget. Confirm the real figures with the county before you rely on them, since the true bill depends on local specifics this tool does not have.
- Sanity-check an assessment notice. When your county mails a new assessed value, it helps to see what the tax would be at the published millage rate. If the estimate jumps sharply from last year, that is a cue to review the assessment for errors and weigh whether an appeal is worthwhile. The tool only shows the arithmetic — whether an appeal succeeds, and any resulting change, is entirely up to your local assessor’s process.
- Compare tax between two towns. Two homes at the same price can carry very different tax bills because millage rates and assessment ratios differ by jurisdiction. Running each town’s numbers side by side turns a vague sense that "taxes are higher over there" into a concrete annual difference, helping you weigh location trade-offs. The calculator does not know either town’s exact rate, ratio, or exemptions, so you supply those values yourself.
- See the effect of a homestead exemption. Many states reduce the taxable value of an owner-occupied primary residence through a homestead exemption. Entering the exemption amount shows how much it trims the annual bill, making it clear why registering for exemptions you qualify for is worth the paperwork. Eligibility rules and dollar amounts are set locally, so treat the reduction shown here as illustrative until you confirm what your jurisdiction actually grants.
- Estimate the escrow portion of a payment. Lenders often collect property tax monthly into an escrow account, so the annual estimate divided by twelve approximates that slice of your payment. Seeing the figure ahead of time helps you anticipate the full monthly cost and avoid surprise at closing. The lender’s own escrow analysis, based on the real tax bill and any cushion they require, is what ultimately governs the amount collected.
How it works
- Enter the market value. Type the home’s estimated market or appraised value — the county’s starting point before any ratio or exemption is applied.
- Set the assessment ratio. Enter the ratio your jurisdiction uses (for example 80% or 100%); assessed value equals market value times this ratio.
- Subtract exemptions. Add any homestead or other exemption amount that reduces the assessed value before tax is figured.
- Enter the millage rate. Provide the local rate in mills; remember one mill is one-tenth of a percent, so 20 mills is 2 percent.
- Read the estimated tax. The tool multiplies taxable assessed value by the rate and shows the estimated annual property tax and effective percentage.
Examples
Input: Market value $300,000, ratio 100%, no exemption, 20 mills
Output: Estimated tax $6,000/yr
20 mills equals 2%, and 2% of $300,000 is $6,000.
Input: Market value $300,000, ratio 80%, $25,000 homestead, 25 mills
Output: Estimated tax $5,375/yr
Assessed = $240,000; taxable = $215,000; × 0.025 = $5,375.
Input: Market value $450,000, ratio 100%, no exemption, 12 mills
Output: Estimated tax $5,400/yr
A lower millage rate offsets the higher value; verify the real rate with your county.
Frequently asked questions
What is a mill or millage rate?
A mill is one-tenth of one percent, or $1 of tax per $1,000 of taxable value. So a 20-mill rate is 2 percent. Local governments set the millage rate to fund schools, roads, and services, and it can change each year.
What is the difference between market value and assessed value?
Market value is roughly what the home would sell for. Assessed value is what the taxing authority uses, calculated as market value times an assessment ratio and then reduced by exemptions. Property tax is figured on the taxable assessed value, not the market value.
Why is my real bill different from this estimate?
Because rates, assessment ratios, and exemptions are set locally and this tool uses the values you type. It also cannot include special assessments, voter-approved levies, or district-specific charges. Always confirm with your county assessor or tax office.
Is property tax tied to a federal tax year?
No. Property tax is a local levy assessed and billed on each jurisdiction’s own schedule, unrelated to the federal income-tax year. This estimate simply annualizes the amount at the rate you provide.
Does it tell me if I can appeal my assessment?
No. It only estimates the tax from the numbers you enter. Whether to appeal, how, and what the result would be are governed by your local assessor’s appeal process, which varies by jurisdiction.
How do I find my millage rate and assessment ratio?
They are published by your county or municipal tax office, often on your assessment notice, your latest tax bill, or the assessor’s website. Use those official figures rather than a guess for a meaningful estimate.
Is anything I enter uploaded?
No. The calculation runs entirely in your browser; nothing you type is sent to a server or stored.
Pro tips
- Use your official assessment notice for the market value, ratio, and exemptions rather than estimates.
- Convert a percentage rate to mills by multiplying by 10 — 1.5% is 15 mills.
- Check every exemption you may qualify for (homestead, senior, veteran, disability); they can meaningfully lower the bill.
- Add any known special assessments separately — this estimate covers only the general millage.
- Confirm the final figure with your county tax office before budgeting or appealing.
Reviewed by Ahsan Mahmood · Last updated 2026-07-08 · Part of ZTools.
For the full,
formatted version of this page, please enable JavaScript and reload
https://ztools.zaions.com/property-tax-calculator.