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💼GST Calculator
GST Exclusive
GST Calculation Guide
Interstate vs Intrastate GST
When goods are sold within the same state:
GST is split equally between CGST and SGST
Example: For 18% GST, CGST = 9% and SGST = 9%
When goods are sold between different states:
Full GST is charged as IGST
Example: For 18% GST, IGST = 18%
Business
GST Calculator
A GST calculator adds or removes Goods & Services Tax from any amount in one click.
What is the GST Calculator?
GST is a consumption tax charged at point of sale. Different countries use different rates (5–28%).
How it works
Tax-inclusive: Base = Total / (1 + rate). Tax-exclusive: Total = Base × (1 + rate).
Formula
GST = Base × Rate; Total = Base + GST
- Base – pre-tax amount
- Rate – decimal (e.g. 0.18 for 18%)
How to use the GST Calculator
- Enter the amount.
- Pick the GST rate.
- Choose add or remove.
- Read the breakdown.
Worked example
| Scenario | $1,000 + 18% GST |
| Calculation | 1000 × 0.18 = 180 |
| Result | GST $180; total $1,180. |
Common use cases
Quoting customers correctly
Verifying invoices
Accounting reconciliation
Tips & best practices
Display tax-exclusive prices to businesses; tax-inclusive prices to consumers.
Frequently asked questions
What’s the difference between GST and VAT?
They are conceptually the same; the name varies by country.
Are all goods GST-able?
No — most countries exempt or zero-rate essentials like basic food and healthcare.