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GST Calculator

GST exclusive means the price you see does not include tax, and GST is added on top. GST inclusive means the price already contains the tax, and you need to extract it. The calculator supports both: enter the amount and pick the mode. Inclusive uses amount minus amount divided by

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GST exclusive means the price you see does not include tax, and GST is added on top. GST inclusive means the price already contains the tax, and you need to extract it. The calculator supports both: enter the amount and pick the mode. Inclusive uses amount minus amount divided by

This free GST Calculator from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.

How to use the GST Calculator

  1. Enter your inputs (date, amount, rate, etc.).
  2. Pick any optional settings (tax mode, country, unit).
  3. Read the result - most calculators update as you type.
  4. Copy the result, or screenshot the breakdown for your records.

What you can do with the GST Calculator

  • Quick personal-finance maths before a major purchase.
  • Tax estimates for freelancers and small businesses.
  • Verify a number on an invoice or receipt.
  • Help kids with homework calculations.

Why use KX Toolkit's GST Calculator

  • Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
  • Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
  • Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
  • Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
  • One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.

Tips for the best results

For currency-aware calculators (GST, tax), always confirm the rate matches the jurisdiction on your invoice - rates change yearly.

Related Calculators

If you find this tool useful, explore the full Calculators collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.

What is the difference between GST inclusive and GST exclusive?
GST exclusive means the price you see does not include tax, and GST is added on top. GST inclusive means the price already contains the tax, and you need to extract it. The calculator supports both: enter the amount and pick the mode. Inclusive uses amount minus amount divided by (1 plus rate), while exclusive multiplies the amount by the rate.
What GST rates does the calculator support?
You can enter any rate manually, so it works for any country. India uses 5, 12, 18, and 28 percent slabs. Australia and New Zealand use a flat 10 and 15 percent. Singapore uses 9 percent. Canada uses 5 percent GST plus provincial sales tax. Just enter your local rate and the math works the same way.
How do I extract GST from an inclusive price?
Switch to inclusive mode and enter the total. The formula is GST equals total times rate divided by (100 plus rate). For example, on a 118 rupee bill at 18 percent GST, the GST portion is 118 times 18 divided by 118, which equals 18 rupees, leaving 100 rupees as the base price. The calculator handles this automatically.
Does the calculator split CGST and SGST for India?
For intra-state transactions in India, GST is split equally between CGST (Central) and SGST (State). If your rate is 18 percent, that becomes 9 percent CGST and 9 percent SGST. The calculator shows the total GST, and you can simply halve it for the CGST or SGST component on a domestic invoice.
Can I use this for invoices and quotes?
Yes, but only as a quick reference. For official invoicing you should use accounting software that handles rounding rules, multiple line items, and the correct tax breakdown for your jurisdiction. The calculator is best for one-off checks, freelance estimates, and verifying that an invoice you received does the math correctly.
Why does my answer differ by one cent from a receipt?
Rounding. Receipts often round each line item before adding GST, while the calculator computes the exact decimal and rounds at the end. Differences of one or two cents are normal and not an error. If you need to match a receipt to the cent, calculate each line item separately rather than the total.

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