GST Calculator

Calculate GST for your products or services quickly and easily.

Amount (in ₹)

GST Rate (%)

GST Amount

₹ 0

Final Amount (with GST)

₹ 0

How It’s Calculated: The Logic

GST Exclusive Mode:

When you enter an amount without GST, the final price is calculated by adding the GST amount to the base price.

Formula: Final Price = Base Price + (Base Price * GST Rate / 100)

This GST Calculator is designed for:

Retailers, wholesalers, MSMEs preparing GST invoices
E-commerce sellers (Amazon/Flipkart/Shopify) pricing inclusive vs exclusive
Freelancers/consultants issuing GST invoices for services
Startups deciding MRP vs before-tax pricing and state/inter-state supplies
Accountants/CAs doing quick checks on CGST/SGST/IGST split
Students/learners understanding basic GST math

Whether you bill GST-inclusive prices (MRP) or GST-exclusive prices, this tool gives a fast, intuitive tax breakdown and split.

How This GST Calculator Works

Q: 1) What’s the difference between GST-inclusive and GST-exclusive?

Inclusive means the price already contains GST ; we back-compute base and tax. Exclusive means tax is added to the base. (Back-calculation mirrors Rule 35.) Tax Portal

Q: 2) When do I use CGST+SGST vs IGST?

If it’s an intra-state supply (supplier and place of supply in the same State/UT) → CGST+SGST . If it’s inter-state → IGST .

Q: 3) Which rate should I pick?

Depends on the HSN/SAC classification and current notifications. Common slabs include 0%, 5%, 12%, 18%, 28% , with special rates for certain items. When unsure, use Custom and verify with official schedules.

Q: 5) Can I compute from MRP (inclusive price)?

Yes—choose Inclusive , enter the MRP, and select the rate. The tool will compute base and GST using the proportionate method.

Q: 6) How is “place of supply” determined?

Rules vary for goods vs services (e.g., delivery location, performance location). This tool doesn’t determine place of supply; it just applies the split you select. Refer to law/notifications or consult your CA.

Q: 7) Are rates changing?

The GST Council periodically considers rationalisation (e.g., merging slabs). Always check the latest decisions/notifications.

The calculator figures out base value, GST amount, total value, and the tax split based on your inputs.

Formulas

Exclusive amount (add GST):
GST = Base × Rate and Total = Base + GST
Inclusive amount (remove GST):
Base = Inclusive ÷ (1 + Rate) and GST = Inclusive − Base
(This mirrors Rule 35 proportionate calculation for tax-inclusive values.) Tax Portal

Split by supply type

Intra-state: GST splits equally into CGST + SGST (half each). CBIC GST
Inter-state: Entire tax is IGST. CBIC GST

Inputs

Amount: number you enter is either before tax (exclusive) or after tax (inclusive)
GST Rate: choose a slab (0%, 0.25%, 3%, 5%, 12%, 18%, 28%) or enter Custom
Amount Type: Inclusive or Exclusive
Supply Type: Intra-state (CGST+SGST) or Inter-state (IGST)

Outputs

Base amount, GST amount, total amount
Break-up: CGST + SGST (intra) or IGST (inter)

Key Assumptions & Logic

Parameter	Value / Logic	Notes
Rate options	0%, 0.25%, 3%, 5%, 12%, 18%, 28% (+ Custom)	Slabs commonly used in India; actual rate depends on HSN/SAC & notifications.
Amount type	Inclusive or Exclusive	Inclusive back-calculation aligns with Rule 35 method.
Supply type	Intra → CGST+SGST; Inter → IGST	Based on place-of-supply rules; this tool lets you choose the type.
What’s notincluded	Compensation Cess, RCM, input tax credit (ITC), e-invoice fields, discounts logic	Add-ons vary by item & transaction; this tool focuses on core GST math.
Rounding	Displays to 2 decimals	Your accounting may round to nearest rupee/paise.
Example	₹1,000 (exclusive) @18% → GST ₹180, Total ₹1,180	For inclusive, ₹1,180 @18% → Base ₹1,000, GST ₹180.

Realism Note

GST outcomes depend on classification (HSN/SAC), exemptions/zero-rating, place of supply, and rate notificationsthat can change. (The GST Council periodically revises rates/structures.) Use this tool for quick math; confirm specifics with your tax advisor and the latest CBIC/GST Council notifications.

Source References

CBIC – About GST (IGST on inter-State supply). CBIC GST
CBIC – FAQs (CGST/SGST on intra-State supply; IGST on inter-State). CBIC GST
CBIC – Rule 35 (tax from inclusive value: proportionate method). Tax Portal
GST Council – Rates & notifications (services; consolidated booklets). GST Council

Disclaimer

This calculator is an educational tool:

Does not determine legal tax liability or compliance.
Cess, RCM, ITC set-off, discounts, freight, advance adjustments, e-invoice fields are not modelled.
Rates/notifications change; consult your CA/tax advisor and CBIC/GST Council updates for your specific goods/services.

Frequently Asked Questions (FAQ)

1) What’s the difference between GST-inclusive and GST-exclusive?

Inclusive means the price already contains GST; we back-compute base and tax. Exclusive means tax is added to the base. (Back-calculation mirrors Rule 35.)Tax Portal

2) When do I use CGST+SGST vs IGST?

If it’s an intra-state supply (supplier and place of supply in the same State/UT) → CGST+SGST. If it’s inter-state → IGST.

3) Which rate should I pick?

Depends on the HSN/SAC classification and current notifications. Common slabs include 0%, 5%, 12%, 18%, 28%, with special rates for certain items. When unsure, use Custom and verify with official schedules.

4) Does this include Compensation Cess or Reverse Charge?

No. Those depend on the item and transaction type and aren’t included here.

5) Can I compute from MRP (inclusive price)?

Yes—choose Inclusive, enter the MRP, and select the rate. The tool will compute base and GST using the proportionate method.

6) How is “place of supply” determined?

Rules vary for goods vs services (e.g., delivery location, performance location). This tool doesn’t determine place of supply; it just applies the split you select. Refer to law/notifications or consult your CA.

7) Are rates changing?

The GST Council periodically considers rationalisation (e.g., merging slabs). Always check the latest decisions/notifications.