GST Calculator
Add or remove Goods and Services Tax — all Indian GST slabs
What is the GST calculator?
India's GST system taxes goods and services at four main rates: 5%, 12%, 18%, and 28%. The GST calculator helps you quickly figure out how much tax is included in a price, or how much GST gets added on top of a base amount. Freelancers sending invoices, small business owners, shop owners, and even customers wanting to understand a bill can use this GST Calculator regularly. CalciHub's GST calculator lets you work in two ways: add GST to get the final price, or strip GST out of a total to find the original amount.
How Does the GST Calculator Work?
The math behind this GST Calculator is simple. Adding GST multiplies the base price by the tax rate. Removing GST which is a reverse calculation divides the total price by the tax factor.
Adding GST: Final Price = Base Price × (1 + GST% / 100)
Removing GST: Base Price = Final Price / (1 + GST% / 100)
Base Price = Price before GST
GST% = The applicable tax rate (5, 12, 18, or 28)
Final Price = Price the buyer pays including GST
How to Use CalciHub's GST Calculator
1. Choose whether you're adding GST to a base price or removing GST from a total.
2. Enter the amount in ₹.
3. Select the GST rate, 5%, 12%, 18%, or 28%.
4. Hit Calculate to get the GST amount and the final or base price.
Tip: If you're a freelancer raising invoices for software services using Calcihub’s GST Calculator, the GST rate is 18%. Always check the applicable rate for your service category on the GST Council's official rate list.
A Quick Example
Anjali runs a graphic design studio in Mumbai and raises an invoice for ₹50,000 worth of design services. She needs to add 18% GST.
Service amount (base): ₹50,000
GST rate: 18%
GST amount: ₹9,000
Total invoice amount: ₹59,000
Anjali collects ₹59,000 from the client and deposits ₹9,000 with the government, the GST Calculator makes this two-second math instead of a potential billing error.
Frequently Asked Questions
The GST Council classifies goods and services under HSN and SAC codes, each mapped to a rate. You can check the official GST rate list on gstn.gov.in or use your CA's guidance. Common ones: restaurant food is 5%, clothing above ₹1,000 is 12%, most services are 18%, and luxury goods are 28%.
When you sell within the same state, the GST is split between CGST (central) and SGST (state), each at half the total rate. So 18% becomes 9% CGST + 9% SGST. When selling across states, the full 18% goes as IGST to the central government. The total amount the buyer pays is always the same.
Businesses with annual turnover above ₹40 lakh (goods) or ₹20 lakh (services) must register for GST. Some states have a lower threshold of ₹10 lakh. E-commerce sellers and inter-state suppliers must register irrespective of their turnover.
Yes, if you're a registered GST taxpayer, you can claim credit for GST paid on your business purchases, this is called Input Tax Credit (ITC). It reduces your final GST liability. You can't claim ITC on personal purchases or on some restricted items like motor vehicles for personal use.
Yes, completely free. No credit card or registration needed. Visit Calcihub’s GST Calculator anytime to calculate GST in seconds.
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Guides on this topic
View all posts →Longer reads that explain the method behind the numbers.