Add GST or sales tax
Choose Price before tax. The calculator multiplies the price by the selected tax rate and adds that tax to the original amount.
Example at 15%$100 + $15 = $115
GST / Sales Tax Calculator
Add tax to a price or work backwards from a tax-inclusive total. Choose a common GST, HST or VAT preset, or enter your own local sales-tax rate.
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Instant calculation
Runs in your browser
Quick calculation
What are you starting with?
New Zealand — GST
Standard GST rate for most taxable supplies.
Check official rate
Remove tax from a total
Choose Tax-inclusive total. The calculator divides the total by one plus the tax rate, so it extracts the actual tax portion instead of simply subtracting the percentage.
Example at 15%$115 → $100 + $15 GST
About the rate presets
FiveMinFree provides these presets as quick calculation aids. Tax treatment can depend on the product or service, location, exemptions, zero-rating and other rules. Canadian provincial presets that combine GST with PST/QST are convenience totals and may not apply to every purchase. US sales tax varies by state and locality, so the US option uses a rate you enter yourself.
Preset rates were checked against the relevant government tax authorities on 5 September 2026. For accounting, filing or legal decisions, verify the current rate and treatment with the applicable authority.