GST (Goods and Services Tax) Calculator
Compute GST and the tax-inclusive total from an amount and rate.
Input Data
Amount before tax.
GST rate (NZ 15%, AU 10%, CA 5%).
Results
15
115
GST = 15; total = 115.
At a glance:GST = amount × rate%; total = amount + GST.
Formula
GST = amount × rate / 100.
Total = amount + GST.
How to Use
- Enter the pre-tax amount and rate.
- The tool returns GST and the inclusive total.
Case Studies
100, 15% → GST 15, total 115
GST = 100×0.15 = 15; total = 115.
FAQ
Reverse?
Total ÷ (1+rate) gives the pre-tax amount.
Versus VAT?
Similar concept; see vat-calculator.
Related Tools
References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.