Sales Tax Calculator
Tính thuế VAT / sales tax trên số tiền
Sales Tax & VAT Calculator
This sales tax calculator lets you add tax to a net price or reverse-calculate the tax hidden inside a gross price — all in one click. Enter any tax rate, whether it is a standard VAT rate, a country-specific GST, or a US state sales tax, and get an instant breakdown of the tax amount, pre-tax price, and tax-inclusive total. No sign-up, no ads, completely free.
Benefits
Using a dedicated sales tax calculator beats mental math or spreadsheet formulas in several ways:
- Dual-direction calculations: Both "add tax to a net price" and "extract tax from a gross price" are supported in the same tool.
- Any rate, any country: Works for VAT (EU, UK, Australia), GST (Canada, New Zealand), US state sales tax, or any custom percentage.
- Instant, error-free results: Three figures — tax amount, pre-tax price, and total — appear the moment you type.
- No installation needed: Runs in your browser; nothing to download or configure.
- Privacy-friendly: All calculations happen locally; your numbers are never sent to a server.
Use cases
The sales tax calculator is useful across a wide range of real-world scenarios:
- E-commerce pricing: Set the right selling price so your margin holds after tax is applied.
- Invoice verification: Quickly confirm that the VAT line on a supplier invoice matches the quoted rate.
- Cross-border purchasing: Estimate import VAT or GST before committing to an overseas order.
- Freelancers & consultants: Bill clients correctly when contracts specify prices exclusive of tax.
- Retail & hospitality: Convert menu or shelf prices between tax-inclusive and tax-exclusive displays.
- Accounting & bookkeeping: Reconcile input and output tax totals without opening a full accounting package.
How to use
Getting your answer takes three steps:
- Step 1 — Enter the amount: Type the price in the Amount field. This can be either the pre-tax price or the tax-inclusive total depending on what you know.
- Step 2 — Enter the tax rate: Type the percentage in the Tax rate (%) field, for example 20 for UK VAT or 8.25 for a Texas sales tax rate.
- Step 3 — Choose the mode: Select Add tax to calculate the gross total, or Extract tax to back out the tax from an already tax-inclusive price.
The result panel shows the tax amount, the net (pre-tax) price, and the gross (tax-inclusive) price side by side.
Frequently asked questions
What is the difference between adding tax and extracting tax? Adding tax multiplies the net price by the tax rate and sums them; extracting tax divides a gross price by (1 + rate) to isolate the net amount, then subtracts to find the tax portion.
Can I use this for US sales tax where the rate varies by state? Yes — just enter the combined state and local rate for the jurisdiction you need (e.g., 10.25% for Chicago, IL) and the calculator handles the rest.
Is the calculator accurate enough for official tax returns? The math is exact for the standard tax formula, but tax filings may involve additional rules such as rounding conventions or exempt items, so always verify with a qualified accountant or your tax authority.
Does this tool work for compound tax situations? For simple single-rate VAT or sales tax it works perfectly. For cascading or tiered tax structures, calculate each tier separately and combine the results manually.