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Millage to Percentage Calculator
Convert a millage rate (mills) to a percentage, decimal, and dollars per $1,000 — and estimate the property tax on any assessed value.
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How to use this calculator
- Enter the millage rate. Type the rate in mills from your tax bill or levy document — for example 23.5.
- Read the conversions. The same rate appears instantly as a percentage, a decimal, and dollars per $1,000 of assessed value.
- Or convert back to mills. Type into the percentage or decimal box instead and the millage rate updates automatically.
- Estimate the tax. Add the property's assessed value to see the estimated annual tax and the monthly equivalent.
Tips
- Use the total combined millage from the tax bill, not just one authority's levy.
- Use the assessed (taxable) value after exemptions — not the market or appraised value.
- Each additional mill costs $1 per $1,000 of assessed value per year.
Converter
Property tax estimate (optional)
Results
- Percentage
- 2%
- Decimal rate
- 0.02
- Tax per $1,000 assessed
- $20
- Estimated annual tax
- $5,000
- Monthly equivalent
- $417
- Tax per $100,000 assessed
- $2,000
One mill equals one-tenth of one percent (0.1%) — or $1 of tax for every $1,000 of assessed value. Enter a millage rate below to see it as a percentage, a decimal, and a per-$1,000 figure, or type in any of those boxes to convert back to mills. Add an assessed value to estimate the annual property tax.
What is a mill?
A mill is a unit of property tax rate equal to one-thousandth of a dollar — $0.001. Because property values are large, tax authorities express rates in mills rather than tiny percentages: a rate of 20 mills is easier to say and read than 0.02.
You will see millage rates on property tax bills, county and city budget documents, school district levies, and bond referendums. The total millage on a tax bill is usually the sum of several overlapping levies — county, city or municipality, school district, and special districts such as fire, library, or water management.
How the conversion works
The math is a simple shift of the decimal point, because 'mill' literally means one-thousandth:
Mills to percentage: divide by 10. Example: 25 mills ÷ 10 = 2.5%. Percentage to mills: multiply by 10. Example: 1.8% × 10 = 18 mills. Mills to decimal: divide by 1,000. Example: 25 mills ÷ 1,000 = 0.025. Mills to dollars per $1,000: no conversion needed — the millage rate IS the tax per $1,000 of assessed value. 25 mills = $25 per $1,000.
To estimate the tax on a property, multiply the assessed value by the millage rate and divide by 1,000: Tax = Assessed Value × Mills ÷ 1,000.
Worked example
Suppose your county's total millage rate is 23.5 mills and your home has an assessed (taxable) value of $250,000 after exemptions.
As a percentage, 23.5 mills is 2.35%. As a decimal it is 0.0235. The annual tax is $250,000 × 23.5 ÷ 1,000 = $5,875 — about $489.58 per month. If the school board adds 1.5 mills, the rate rises to 25 mills and the same home's tax rises by $250,000 × 1.5 ÷ 1,000 = $375 per year.
Millage rate vs. effective tax rate
The millage rate is applied to the assessed value, which is often not the same as market value. Many states assess at a fraction of market value, and exemptions (homestead, senior, veteran, agricultural) reduce the taxable value further.
The effective tax rate — the tax actually paid divided by the property's market value — is therefore usually lower than the millage rate suggests. Two properties with the same millage rate can carry very different tax burdens if their assessment ratios or exemptions differ. When comparing jurisdictions, convert millage to an effective rate using actual tax bills whenever possible.
Frequently asked questions
What is one mill in percentage terms?
One mill equals 0.1% (one-tenth of one percent). So 10 mills = 1%, 20 mills = 2%, and 25 mills = 2.5%.
How do I convert a millage rate to a percentage?
Divide the millage rate by 10. For example, 18.5 mills ÷ 10 = 1.85%. To go the other way, multiply the percentage by 10.
How do I calculate property tax from a millage rate?
Multiply the assessed (taxable) value by the millage rate, then divide by 1,000. A $300,000 assessed value at 22 mills: $300,000 × 22 ÷ 1,000 = $6,600 per year.
Is the millage rate applied to market value or assessed value?
Assessed (taxable) value. Depending on your state, assessed value may be a fraction of market value and may be reduced further by exemptions such as homestead, senior, or veteran exemptions.
Why does my tax bill list several millage rates?
Multiple taxing authorities overlap on the same property — county, city, school district, and special districts. Each levies its own millage, and your bill applies the combined total to your assessed value.
Before you act on this result
This calculator is general education, not advice. Before you sign, file, offer, or fund anything, walk through this quick checklist:
- Confirm every input (price, rate, taxes, insurance, HOA, fees) against a real document — a Loan Estimate, purchase contract, tax bill, or HOA statement — not a guess.
- Verify the local rules where the property sits: closing customs, transfer taxes, disclosure requirements, and title practices differ by state and county.
- Talk to a licensed professional in that jurisdiction — a local real estate broker, closing attorney or title company, CPA, state-licensed appraiser, or mortgage loan officer.
- Remember Larius is licensed as a real estate broker in North Carolina only. Anything outside NC needs a locally licensed pro.
- Get material assumptions in writing (rate lock, insurance quote, tax cap, rent comps) before you commit money or sign.
Read our Editorial FAQ for the full education-vs-advice breakdown, or let us know if a number here looks wrong.
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