Introduction

Add or remove GST from any amount instantly. Enter your base price, pick a GST rate, and get a full breakdown — including CGST and SGST — in seconds.

How to Use

1. Select your currency from the dropdown.
2. Choose Add GST to calculate a GST-inclusive price from a base amount, or Remove GST to extract GST from a total that already includes it.
3. Enter your net price / base amount.
4. Select a GST rate (5%, 12%, 18%, 28%) or enter a custom rate.
5. View your result: final total, total GST component, base amount, and the CGST/SGST split.
6. Use Copy Breakdown Summary to copy the full result.

GST Calculation Formula

Add GST (find the gross price from a base amount): Total = Base Amount × (1 + GST Rate)

Remove GST (find the base amount from a gross price): Base Amount = Total ÷ (1 + GST Rate)

GST Amount = Total − Base Amount

Example Calculation

For a base amount of ₹10,000 at 18% GST:

Adding GST:

• Base Amount: ₹10,000.00
• Total GST (18%): ₹1,800.00
• CGST (9%): ₹900.00 | SGST (9%): ₹900.00
• Final Total: ₹11,800.00

Removing GST (from the same ₹11,800 total at 18%):

• Base Amount: ₹10,000.00
• GST Removed: ₹1,800.00

CGST, SGST, and IGST Explained

For transactions within the same state, GST is typically split equally into CGST (Central GST) and SGST (State GST) — the calculator shows this split above. For transactions between different states, GST is instead charged as IGST (Integrated GST), a single combined tax rather than a CGST/SGST split. Always check your invoice type to confirm which applies to your transaction.

Limitations

This calculator provides a general GST estimate based on the rate and amount you enter. It doesn’t account for exemptions, special category rates, reverse charge scenarios, or invoice-specific rules. For filing, invoicing, or compliance decisions, verify figures against official tax authority rates and consult a tax professional.

Frequently Asked Questions

How is GST calculated?

To add GST, multiply the base amount by (1 + GST rate). To remove GST from a total, divide the total by (1 + GST rate) to find the base amount, then subtract to find the GST portion.

How do I remove GST from a total amount?

Switch to “Remove GST” mode, enter the GST-inclusive total, and select the applicable rate. The calculator will show the original base amount and the GST portion separately.

What’s the difference between CGST, SGST, and IGST?

CGST and SGST apply to transactions within the same state and together make up the total GST rate, split equally. IGST applies to inter-state transactions and is charged as a single combined tax instead.

Is GST calculated on MRP or base price?

GST is calculated on the taxable (base) value of a good or service, not necessarily the final MRP, which may already include GST. Check your invoice to confirm whether a listed price is GST-inclusive.

What are the different GST rate slabs?

This calculator offers common preset rates (5%, 12%, 18%, 28%) plus a custom rate option. GST slabs are set by tax authorities and can change — verify current official rates before filing or invoicing.

Summary

Use the calculator above to add or remove GST from any amount instantly. Rates and calculations shown are for general estimation purposes only — verify current official GST rates and consult a tax professional for filing or compliance decisions.