GST Calculator
Quickly calculate GST amount and see the price before and after GST for your invoices and quotes.
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This GST calculation is for quick illustration only. Invoice rounding, discount structure and state-wise rules may slightly change the final amount on your official tax invoice.
About the MarkLapse GST Calculator
The MarkLapse GST Calculator is designed for founders, agencies and freelancers who raise invoices regularly and want a fast way to work out GST amount. Enter the base amount or GST-inclusive amount and choose the right GST slab to see the split between base value and tax.
You can use this GST calculator for goods and services falling under 5%, 12%, 18% or 28% slabs, or set a custom percentage when you need. It helps you quickly estimate selling prices, quotations and tax impact before finalising your invoice.
GST Calculator – Frequently Asked Questions
How do I use this GST calculator?
Enter the amount, choose the correct GST rate and select whether the amount is before or after GST. The calculator will instantly show base amount, GST amount and total price.
Can this calculator add and remove GST?
Yes. If your amount is without GST, choose “Amount without GST”. If your amount already includes GST, select “Amount inclusive of GST” to back-calculate the tax portion.
Which GST slabs are supported?
The calculator supports common GST slabs like 0%, 5%, 12%, 18% and 28%. You can also enter a custom percentage when needed.
Is this GST calculator accurate for filing returns?
The GST values are mathematically correct for basic calculations. However, return filing may involve additional rules, exemptions and rounding as per GST law, so always cross-check with your accountant or GST software.