Percentage Calculator
Find a percentage of a number or a percentage change.
Finance & calculatorsFinance & calculators tools
GST Calculator
Add or remove a configurable goods and services tax rate.
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How to use gst calculator
- Enter Amount and the GST rate you have independently selected.
- Choose Add GST or Remove included GST according to the amount's meaning.
- Choose Calculate and compare before-tax, GST, and including-tax values.
Work through an example
Separate a tax-exclusive base, tax amount, and inclusive total without assuming which rate legally applies.
Add a chosen GST percentage or remove it from an included total →Formats, privacy, and practical limits
Illustrative calculations based on the values you enter. Figures exclude fees, taxes, and rate changes unless you include them. Returns are assumptions, not guarantees.
Files and generated results exist only for this tab session. Download any result you want to keep before leaving the page. Browsers may use temporary memory or disk cache while processing.
Frequently asked questions
How does it remove tax from an inclusive amount?
It divides the inclusive amount by one plus the decimal tax rate to find the base, rather than subtracting that percentage of the inclusive total.
Does it determine the applicable GST rate?
No. You choose the rate. The tool does not determine tax eligibility, filing obligations, or treatment for a particular product or jurisdiction.
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