GST Calculator

Canadian Goods and Services Tax Calculator

Some Canadian provinces changed their tax system and instead of GST (Goods and Services Tax) and PST (Provincial Sales Tax)* introduced HST (Harmonized Sales Tax), but majority still use GST. GST is used in Alberta, British Columbia, Manitoba, Northwest Territories, Nunavut, Quebec, Saskatchewan and Yukon.

Current GST rate in Canada is 5%. This is very simple GST calculator:


GST calculation is quite simple. Here are two scenarios:

  • You have price without GST and you need to calculate final price including GST:
    base_amount is a price before GST is applied
    GST = base_amount * 0.05;
    final_price = base_amount * 1.05;

    Example: base_amount = $100, GST= $100 * 0.05 = $5 and final_price =$100 * 1.05 = $105
  • Given price is GST inclusive and reverse GST calculation must be performed:

    final_price is GST inclusive price GST part in this case is more complicated gst = final_price * 5 / 105 = final_price / 21
    base_amount = final_price / 1.05

    Example: final_price = $100, GST= $100 / 21 = $4.76 and base_amount = $100 / 1.05 = $95.24

But you don't need to know all these formulas and can just use above GST calculator to calculate GST or reverse GST.

* - in Quebec PST is called QST (Quebec Sales Tax) and in Manitoba it is RST (Retail Sales Tax).

Sales tax (GST/VAT) calculators for other countries: