Enter any U.S. ZIP code to estimate the combined state, county, and city sales tax on a purchase, using average combined rates for all 50 states as of 2026.
Two tools. ZIP code lookup and state averages. That covers most of what you need.
A purchase in the United States is typically taxed at a combined rate of roughly 0% to 11.5%, made up of a state base rate plus average county, city, and special-district add-ons for that ZIP code. Five states, Alaska, Delaware, Montana, New Hampshire, and Oregon, charge no statewide sales tax at all, though a few Alaska municipalities add their own local rate. This tool applies the average combined rate for your ZIP code's state to your purchase amount, which is useful for a quick estimate but is not a substitute for the exact local rate your state or county publishes. For filing, remitting, or any figure that has to be exact, verify with your state's department of revenue before you rely on it.
Two addresses on the same street can owe different tax. That is not a bug in the system - that is how U.S. sales tax works.
Most people land here for one of two reasons, and they need different tools. If you already know the state or you're comparing a handful of them, the state reference table is faster: it lists every state's legislated base rate next to our average combined estimate, and you can download the whole thing as a CSV if you need it in a spreadsheet. If you have an actual ZIP code and an actual dollar amount, the ZIP calculator is the one to open. Type in the code, type in the purchase price, and it maps the ZIP to a state and multiplies by that state's average combined rate. Neither tool asks who you are or where you live beyond the ZIP code you type in, and neither one sends that ZIP code anywhere. The math runs in the page itself.
A third case comes up more than you'd think: shoppers trying to sanity-check a receipt after the fact. You already have the total. You're not trying to find a rate, you're trying to figure out whether the number on the paper is plausible. For that, the state table is usually the quicker read. Find your state, look at the average combined rate, and see if the math roughly lines up. It won't match to the penny, because your specific city and county may run higher or lower than the state's average, but it will tell you if a receipt is in the right neighborhood or wildly off.
Both tools use an average combined rate per state, not a rate tied to your specific street address. That's a real limitation, not a rounding error. Sales tax in the U.S. stacks: a state base rate, then county tax on top, then sometimes city tax, then occasionally a special district for things like transit or stadiums. Two ZIP codes in the same state, or even two addresses inside the same ZIP code, can land on different combined totals depending on which of those layers apply. The average combined figure here smooths all of that into one number per state, which makes it useful for a fast estimate and useless for anything that needs to be exact to the cent.
The tools also assume a standard taxable purchase. Groceries, prescription drugs, and clothing get exemptions or reduced rates in a number of states, and those carve-outs aren't built into this average. Neither is the shipping-and-handling question, since some states tax it and some don't. If you're pricing a specific transaction for a business, or you need a number that will hold up on a tax return, this is the wrong level of precision. Your state's department of revenue, or a county assessor's office for property-adjacent questions, is the source that actually has your address on file.
The most common one is assuming a state's tax rate is a single number. It usually isn't. A state can advertise a base rate of, say, mid-single digits, and the number a shopper actually pays at the register can run several points higher once local add-ons are stacked on. Skipping that stacking is how people underestimate a big purchase by a meaningful margin.
The second mistake runs the other way: treating the average combined rate as gospel for a specific address, then being surprised when the receipt doesn't match. The average is built from typical local add-ons across a state, so a ZIP code with an unusually high or low local rate will drift from it. It's a starting point, not a final answer.
The third is forgetting that five states don't have a statewide sales tax at all, and mentally applying "average U.S. rate" logic to a purchase made in one of them. If you're shopping in Oregon, checking a ZIP-based estimate that assumes every state charges something will just confuse you. Check which bucket your state falls into before you do any math on top of it.
No. Alaska, Delaware, Montana, New Hampshire, and Oregon have no statewide sales tax. Alaska is the exception among the five: some of its municipalities charge their own local sales tax even though the state itself does not.
Because this site's rate is a state average, and your address has its own specific stack of state, county, city, and sometimes special-district taxes. Two people who live a few blocks apart can pay different combined rates.
No. Treat it as a quick estimate for budgeting or checking a receipt. For filing, remitting, or any figure that needs to be exact, use your state's department of revenue rate for the specific address in question.
No. The calculation runs in your browser using a built-in ZIP-to-state map and a rate table. Nothing you type is sent anywhere or saved.