GST / VAT Calculator

What GST / VAT Calculator helps you do

Add GST or VAT to a net price, or extract the tax component from a gross total using a rate you enter. Supports common currencies for quick invoices, receipts, and pricing spreadsheets — arithmetic only, not filing advice. It is the check before a number goes into an invoice, not a substitute for local tax rules.

Calculations run in your browser. Haivix does not fetch tax tables or store your amounts.

How it works

In exclusive mode the net amount is the input, tax is net multiplied by the rate, and gross is net plus tax. In inclusive mode the gross is the input, net is gross divided by one plus the rate, and tax is the difference. The currency choice only changes the symbol and formatting; no exchange rate is applied.

How to use GST / VAT Calculator

1. Enter the amount and tax rate, then choose tax-inclusive or tax-exclusive mode.
2. Read net, tax, and gross totals.
3. Adjust the currency symbol if needed.
4. Copy the breakdown for the invoice or expense record.

When to use it

• Back out VAT from a receipt total when only the gross price is shown.
• Quote a tax-inclusive shelf price from a net wholesale cost.
• Sanity-check GST on a line item before sending a client invoice.
• Check a restaurant bill or a service charge.
• Convert a net quote into a gross price for a customer.
• Split a mixed total into net and tax for bookkeeping.
• Check a discount before tax is applied.

When not to use it

• Do not use it for jurisdiction-specific exemptions, reduced rates or filing rules.
• Do not rely on it for customs, import duties or cross-border tax treatment.
• Do not treat the result as a certified tax calculation.

Example

A receipt shows 115.00 including 15% VAT. Inclusive mode returns a net of 100.00 and tax of 15.00. The same figures are checked in exclusive mode by entering 100.00, which returns 115.00 and confirms the arithmetic.

What you can do with GST / VAT Calculator

• Add tax to a net amount.
• Extract tax from a gross amount.
• Choose from USD, PKR, GBP, EUR, AED and INR.
• Read net, tax and gross totals together.
• Copy a plain-text tax breakdown.
• Change the rate without reloading the page.
• Switch modes without re-entering the amount.
• Reset the amount to zero for a new calculation.

Example: back out VAT from a receipt

Enter the gross receipt total, the VAT rate and choose Includes tax. The tool returns the net amount and the tax component separately.

Check the result against the receipt's tax line. A one-cent difference is usually a rounding rule in the till, not a calculation error.

Copy the breakdown into the expense record or the invoice note.

What to know before you start

• Does not apply jurisdiction-specific exemptions, rounding rules, or filing obligations.
• Does not convert between currencies; it only formats the chosen symbol.
• Assumes a single tax rate for the whole amount.
• Does not handle compound taxes or multiple tax lines.
• The result is arithmetic, not tax advice.

Common mistakes

• Using exclusive mode on a gross receipt and adding tax twice.
• Applying the rate to the gross amount instead of the net.
• Mixing currencies in one invoice.
• Assuming the calculator knows local exemptions or reduced rates.
• Rounding each line item before summing instead of rounding the total.
• Using a rate of 0.15 instead of 15 for a 15% tax.
• Leaving the previous rate in place when checking a second receipt.
• Assuming a reduced rate applies to the whole bill.

Troubleshooting

If the tax looks too high, check the mode; an inclusive gross read as exclusive adds tax on top.

If the net and tax do not add up to the gross, a rounding rule in the source may explain the difference.

If the currency symbol is wrong, change the selector; no conversion is performed.

If the rate is a decimal such as 7.5, enter 7.5 rather than 0.075.

If the result is needed for a filing, confirm the rate and rounding rules with the tax authority.

If the amount includes multiple tax lines, calculate each line separately and add the results; this calculator assumes one rate for the whole amount.

If a receipt shows a different tax because of item-level rounding, compare the total tax rather than recalculating each line.

If two currencies appear in one record, calculate each currency separately; no exchange rate is applied.

Related standards and documentation

• GST and VAT rules are jurisdiction-specific and are not standardized by a single global rate.
• Invoice arithmetic generally follows the rounding rules of the issuing jurisdiction.