15 percent GST Calculator

This is very easy to use 15% GST Calculator. Calculate inclusive, exclusive or reverse 15% GST rate with this calculator.


15% GST rate is calculated in New Zealand

How to calculate 15% GST manually

  • It is very easy to calculate GST at 15% rate: just multiple your GST exclusive amount by 0.15.

$200 is GST exclusive value

$200 * 0.15 = $30 GST amount

  • To get GST inclusive amount multiply GST exclusive value by 1.15

$200 is GST exclusive value

$200 * 1.15 = $230 GST inclusive amount

  • To get GST part of GST inclusive amount you need divide GST inclusive amount by 115 and multiply by 15

$345 is GST inclusive value

($345 / 115) * 15 = $45 GST value

  • To get GST exclusive amount while knowing GST inclusive value you need to multiply GST inclusive price by 100 ant then divide result by 115

$345 is GST inclusive value

$345*100=$34500

$34500/ 115 = $45

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