GST Calculator
What Is the GST Calculator?
The GST Calculator on All Unit Tools is a comprehensive, free online utility that calculates Goods and Services Tax (GST) amounts for businesses, consumers, and accounting professionals. GST is a value-added tax levied on most goods and services sold for domestic consumption, and this tool helps you quickly compute GST amounts, reverse calculate GST from total amounts, and understand the tax breakdown for any transaction.
This tool solves the complex tax calculations that businesses and individuals face daily, ensuring accurate GST computations for invoicing, pricing, accounting, and financial planning. Whether you're adding GST to product prices or extracting GST from total bills, our calculator provides instant, accurate results that comply with standard GST calculation methods.
Who Needs a GST Calculator?
GST calculations are essential for businesses of all sizes, accounting professionals, consumers, and anyone involved in commercial transactions. Our tool serves diverse users who need accurate tax computations for various purposes.
Business Owners
Calculate GST for pricing, invoicing, and accounting. Determine tax liabilities for sales and input tax credits for purchases across different GST slabs.
Accountants & CAs
Perform accurate GST calculations for client accounts, tax filings, audits, and compliance checks. Handle complex GST scenarios with multiple tax rates.
Retailers & E-commerce
Calculate GST for product pricing, sales transactions, and online orders. Ensure accurate tax application across different product categories and states.
Developers & IT
Integrate GST calculations into software applications, e-commerce platforms, and billing systems. Test GST calculation logic and validate tax computations.
Students & Educators
Learn about indirect taxation systems, practice GST calculations for commerce and accounting courses, and understand real-world tax applications.
Consumers & Shoppers
Verify GST amounts on bills, understand tax breakdowns for purchases, and calculate pre-tax prices when only total amounts are shown on invoices.
How to Calculate GST in 3 Simple Steps
Enter Amount & Select Type
Input the base amount (excluding GST) or total amount (including GST). Choose whether you want to add GST to a base amount or extract GST from a total amount.
💡 Base amount is pre-tax, total amount includes GST
Choose GST Rate
Select the applicable GST slab: 0%, 5%, 12%, 18%, or 28%. Choose based on the product/service category as per government classification.
Most common rates: 5% (essential), 12% & 18% (standard), 28% (luxury)
View Detailed Breakdown
Get complete results showing GST amount, CGST, SGST/UTGST, total amount, and net price. Results are displayed in both numeric and percentage formats.
CGST = SGST = GST/2 for intra-state transactions
GST Slabs & Applicable Categories
0% GST (Nil Rated)
Essential food items, fresh fruits/vegetables, milk, eggs, bread, salt, newspapers, books, handloom products, and certain agricultural products.
Example: Fresh vegetables, unbranded food grains
5% GST (Lowest Tax)
Household necessities: packaged food items, tea, coffee, spices, edible oil, sugar, coal, medicines, footwear below ₹1000, and transport services.
Example: Packaged cereals, life-saving drugs
12% GST (Lower Standard)
Processed foods, butter, cheese, ghee, mobile phones, business class air travel, sewing machines, and certain financial services.
Example: Packaged butter, computers, sewing machines
18% GST (Standard Rate)
Most goods and services: hair oil, toothpaste, soaps, capital goods, industrial intermediaries, IT services, restaurants, and telecom services.
Example: Toothpaste, soap, financial services
28% GST (Highest Tax)
Luxury and sin goods: automobiles, ACs, refrigerators, cement, cigarettes, aerated drinks, luxury hotels, and cinema tickets.
Example: Cars, luxury watches, tobacco products
Special Rates & Cesses
Some goods attract additional compensation cess (like automobiles, tobacco, aerated drinks) on top of the 28% GST rate. Our calculator includes these special calculations.
Example: Cars may have 28% GST + compensation cess
Common GST Calculation Scenarios
Retail Product Pricing
Calculate final selling price by adding GST to wholesale or manufacturing costs. Essential for retailers to determine correct pricing with tax included.
Example: Cost ₹1000 + 18% GST = Selling price ₹1180
Invoice Verification
Verify GST calculations on supplier invoices. Extract GST amount from total bills to ensure correct tax application and claim accurate input tax credit.
Example: Bill total ₹2360 - Extract 18% GST = ₹360 tax
Inter-State vs Intra-State
Calculate IGST for inter-state transactions (single tax) or CGST+SGST for intra-state transactions (split equally between central and state governments).
18% GST = 9% CGST + 9% SGST (intra-state) or 18% IGST (inter-state)
Construction & Real Estate
Calculate GST on construction services, property transactions (with special rates for affordable housing vs. regular housing), and real estate development.
Example: Affordable housing 1% GST, Regular housing 5% GST
Restaurant & Food Services
Calculate GST for restaurant bills (different rates for AC vs. non-AC, with/without alcohol), food delivery services, and catering services.
Example: Restaurant without alcohol: 5% GST with ITC restrictions
E-commerce & Digital Services
Calculate GST for online sales, digital products, software services, OTT platforms, and e-commerce marketplace transactions with TCS provisions.
Example: Digital services to overseas clients may be zero-rated
Key Features of Our GST Calculator
➕ Add GST & Reverse Calculate
Both forward calculation (add GST to net amount) and reverse calculation (extract GST from total amount) with equal accuracy and ease.
🏛️ CGST/SGST/IGST Breakdown
Automatic split between CGST and SGST for intra-state transactions or IGST calculation for inter-state transactions based on transaction type.
📊 All GST Slabs Covered
Complete coverage of all GST rates: 0%, 5%, 12%, 18%, and 28%, plus special rates for composition scheme and specific industries.
💰 Multiple Currency Support
Calculate GST in different currencies including INR, USD, EUR, GBP, and more. Perfect for import/export businesses and international transactions.
📱 Mobile-Optimized Design
Calculate GST on any device. Perfect for quick calculations at shops, offices, or during business meetings using your smartphone or tablet.
💾 No Installation Required
Access directly from any browser—no apps to download, no accounts to create. Bookmark it for instant GST calculations whenever needed.
Frequently Asked Questions
What's the difference between CGST, SGST, and IGST?
CGST (Central GST): Collected by Central Government on intra-state transactions.
SGST (State GST): Collected by State Government on intra-state transactions.
IGST (Integrated GST): Collected by Central Government on inter-state transactions.
For intra-state: GST = CGST + SGST (equal halves). For inter-state: GST = IGST (single tax).
How do I calculate GST from a total amount?
Use our reverse GST calculation feature. Enter the total amount (including GST) and the GST rate. The calculator will extract the GST amount and show the net price. Formula: GST Amount = Total Amount × (GST Rate ÷ (100 + GST Rate)). Example: For ₹1180 total with 18% GST: GST = 1180 × (18 ÷ 118) = ₹180.
Are there different GST rates for services vs. goods?
Most services fall under the 18% GST slab, though some have special rates. Examples: Restaurant services (5%), Hotel accommodation (varies by tariff), Transportation services (5%, 12%, or 18% depending on type), Healthcare and educational services (exempt or 0%). Goods have more varied rates across all slabs from 0% to 28%.
What is the composition scheme in GST?
The composition scheme is for small businesses with turnover up to ₹1.5 crore (₹75 lakh for some states). They pay GST at fixed rates (1%, 5%, or 6% depending on business type) instead of regular GST slabs. They cannot claim input tax credit and cannot make inter-state supplies. Our calculator includes composition scheme rates for eligible businesses.
How does GST calculation work for mixed supplies?
For mixed supplies (bundled goods/services with different GST rates), the entire supply is taxed at the highest rate applicable to any item in the bundle. For composite supplies (natural bundled items), the principal supply's rate applies. Calculate each item separately if billed individually, or use the highest rate if bundled together.
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