HST Calculator
Last updated: October 18, 2026
Use this free HST calculator to calculate the Harmonized Sales Tax or perform a reverse HST calculation.
Enter an amount in any one of these fields:
- Price before HST—to calculate the HST and total price.
- HST amount—to calculate the prices before and after HST.
- Price including HST—to calculate the included HST and price before tax.
The remaining fields update automatically.
Need to take HST out of a total instead? Try the Reverse HST Calculator.
Rates: Ontario 13%, Nova Scotia 14%, New Brunswick 15%, Prince Edward Island 15%, Newfoundland & Labrador 15%. Source: Canada Revenue Agency GST/HST calculator.
Tired of adding up HST by hand? HST Helper scans your invoices and records the HST for you.
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