Inclusive-versus-exclusive price checks
Use the result as a check within this type of task, with the assumptions shown above.
MAXScanner Calculator
GST Calculator
Calculate GST amount and base/final price for tax-added or tax-inclusive inputs.
Live editable inputs
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Formula and working
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Assumptions visible
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Inputs
Results
1,180 including GST
Taxable/base value: 1,000
GST amount: 180
GST-inclusive total: 1,180
Show the working
- 1. GST = 1,000 × 18/100 = 180.
- 2. Total = 1,000 + 180 = 1,180.
This is arithmetic only. It does not choose the applicable GST rate, place-of-supply treatment, exemptions, cess, input-tax credit or invoice classification.
For an inclusive amount, the tax is extracted by dividing through 1 + rate/100 rather than multiplying the gross total by the rate.
More actions
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How to use this calculator
Add GST to a tax-exclusive base amount or reverse-extract GST from a price that already includes tax. The two directions use different arithmetic: an inclusive gross amount must be divided by 1 + rate rather than multiplied directly by the GST percentage.
Step-by-step
- Step 1
Enter the price and GST rate.
- Step 2
Leave the inclusive option off to add GST to a base price, or enable it when the entered total already contains GST.
- Step 3
Check the base/taxable value, GST amount and final GST-inclusive amount before carrying the figures into an invoice or accounting workflow.
How the result is calculated
Exclusive: GST = base × rate/100. Inclusive: base = gross ÷ (1 + rate/100); GST = gross − base.
Where this calculator is useful
Reverse GST extraction from a gross amount
Use the result as a check within this type of task, with the assumptions shown above.
Simple invoice arithmetic when the applicable rate is already known
Use the result as a check within this type of task, with the assumptions shown above.
Common questions
How do I remove GST from an inclusive price?
Divide the inclusive price by 1 + GST rate/100 to get the base value, then subtract that base from the inclusive total to get the tax amount.
Why not multiply an inclusive total by the GST rate?
Because the inclusive total already contains tax. Multiplying the gross total by the rate overstates the tax; the base must first be recovered through reverse division.
Does this calculator choose the correct GST rate or tax treatment?
No. It performs arithmetic using the rate you enter. Product classification, exemptions, cess, place of supply, CGST/SGST/IGST treatment and input-tax credit require the applicable GST rules and records.
Need a different calculation?
Use the calculator library to switch tasks when the question, unit or assumption changes.
Browse all calculatorsCommon GST questions
GST amountGST-inclusive priceGST-exclusive pricebase price before GST