GST Calculator

Calculate Goods and Services Tax (GST) by adding or extracting it from any amount with country-specific rates.

Total with GST
$110.00
Price Before GST $100.00
GST Amount $10.00
Total Price $110.00

How to Use the GST Calculator

Calculate GST instantly by entering your amount and GST rate. This calculator works in two modes: Add GST to calculate the total price including tax, or Extract GST to separate the GST component from a GST-inclusive amount.

  1. Select your mode: Add GST or Extract GST
  2. Enter the amount (ex-GST if adding GST, inc-GST if extracting GST)
  3. Enter the GST rate percentage or select a country preset
  4. Results update instantly showing price before GST, GST amount, and total price

GST Calculation Formulas

To add GST:

Total Price = Price Before GST × (1 + GST Rate / 100) GST Amount = Price Before GST × (GST Rate / 100)

To extract GST:

Price Before GST = Total Price / (1 + GST Rate / 100) GST Amount = Total Price - Price Before GST

For example, with a 10% GST rate: $100 ex-GST becomes $110 inc-GST ($10 GST added). Conversely, $110 inc-GST becomes $100 ex-GST ($10 GST extracted).

Common GST Examples

  • Australia (10%): $500 ex-GST → $550 inc-GST ($50 GST)
  • India Standard Rate (18%): ₹1,000 ex-GST → ₹1,180 inc-GST (₹180 GST)
  • Canada Federal (5%): $200 ex-GST → $210 inc-GST ($10 GST)
  • Extracting GST: NZ$115 inc-GST at 15% → NZ$100 ex-GST (NZ$15 GST extracted)
  • Singapore (9%): S$1,000 ex-GST → S$1,090 inc-GST (S$90 GST)

Understanding GST (Goods and Services Tax)

Goods and Services Tax (GST) is a consumption tax applied to most goods and services sold for domestic consumption. GST is used in over 160 countries, including Australia, India, Canada, New Zealand, and Singapore. It's similar to Value Added Tax (VAT) used in European countries.

GST rates vary by country and product category. Australia has a flat 10% rate with some exemptions. India uses multiple GST rates (5%, 12%, 18%, and 28%) depending on the product category. Canada has a 5% federal GST plus provincial sales taxes in most provinces.

GST-registered businesses collect GST from customers and claim input tax credits for GST paid on business expenses. The net amount is remitted to the tax authority. Businesses must register for GST once their turnover exceeds the registration threshold, which varies by country.

Unlike sales tax which is only applied at the final sale, GST is applied at each stage of the supply chain. However, businesses can claim credits for GST paid on inputs, so the tax burden ultimately falls on the end consumer.

Frequently Asked Questions

GST (Goods and Services Tax) is a consumption tax charged on most goods and services. Businesses collect GST from customers and pay it to the government, while claiming credits for GST paid on business purchases. The rate varies by country: Australia 10%, India 5-28%, Canada 5%, New Zealand 15%.
To add 10% GST, multiply the ex-GST price by 1.10 (e.g., $100 × 1.10 = $110). To extract 10% GST from an inc-GST price, divide by 1.10 (e.g., $110 ÷ 1.10 = $100). The GST amount is the difference: $110 - $100 = $10.
Ex-GST (exclusive of GST) is the price before GST is added. Inc-GST (inclusive of GST) is the total price including GST. Business-to-business prices are often quoted ex-GST, while consumer prices are typically inc-GST.
Registration thresholds vary by country. In Australia, you must register if your annual turnover exceeds $75,000 ($150,000 for non-profits). In India, the threshold is ₹40 lakhs (₹20 lakhs for services). Canada requires registration at $30,000 over 4 consecutive quarters. You can voluntarily register below these thresholds.
Common GST-free items include basic foods (bread, milk, fruits, vegetables), medical and health services, education services, and certain childcare services. Exports are typically zero-rated. Some items like financial services may be input-taxed or exempt. Check your country's tax authority for specific exemptions.
GST-registered businesses can claim input tax credits for GST paid on business purchases. You must have a valid tax invoice and the purchase must be for a creditable purpose (business use). Some items like entertainment have restrictions. Credits are claimed through regular GST returns.
GST is applied at each stage of the supply chain with businesses claiming credits for tax paid on inputs, while sales tax is only charged once at the final point of sale. GST is more efficient and reduces tax cascading. Countries like Australia, India, and Canada use GST, while the US primarily uses sales tax.
India has a multi-tier GST structure: 0% (essential items), 5% (necessities like food grains), 12% (processed foods), 18% (standard rate for most items), and 28% (luxury goods and sin goods). An additional cess applies to certain luxury and sin goods. The rate depends on the HSN code of the product or service.

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