Public Tool
GST Calculator
Quickly add or extract 15% GST from any amount. Uses the IRD-recommended formula for 100% accuracy.
Calculation Mode
Amount (excl. GST)
$
$1,000.00
$150.00
$1,150.00
Amount Breakdown
How is GST Calculated?
Adding GST: Original Amount × 1.15 = Total with GST
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