GST Calculator by Spolvero
GST calculator for Android
The GST number in one glance. A bill PDF in 10 seconds.
Add or remove GST, split CGST and SGST or IGST correctly, and send a GST bill as a PDF. No account, no permission prompts, and no ad ever between you and your number.
What GST Calculator does
Add or remove GST, split CGST and SGST or IGST correctly, and send a GST bill as a PDF. No account, no permission prompts, and no ad ever between you and your number.
A GST bill as a PDF
Add items with GT, tap CHK, then Send as invoice. The app makes a PDF tax invoice with your business name and GSTIN, invoice number, CGST and SGST or IGST and the total in words, and hands it to WhatsApp or any app.
Add or remove GST
Add GST to a price or pull it back out of a total. A CGST SGST calculator too: CGST and SGST within a state, IGST across state lines.
Every current slab
0%, 5%, 18% and 40%, plus 3%, 0.25% and the composition rates, with four rate keys you set once.
HSN codes and history
Find a product's HSN or SAC code by name. Memory keys, markup, and your last 20 calculations, one tap to bring any of them back.
A closer look
Type an amount. Tap a rate. Read the answer.
That's the whole app. No account, no permission prompts, and no waiting on a network.
- Your calculations never leave your phone
- While you work, the only ad is one banner below the keypad
- Works offline from the first launch
- Rates reproduced from official GST notifications
When people reach for GST Calculator
Shopkeepers and small traders
Working out the GST on a sale, or pulling it back out of a rounded total.
Freelancers raising invoices
Adding the right rate and splitting CGST and SGST correctly for an in-state client.
Anyone checking a bill
A restaurant or hotel bill where the tax line looks wrong and you want to check it.
Students and new accountants
Learning which slab applies, and finding a product's HSN code by name.
Type an amount. Tap a rate. Read the answer.
That's the whole app. No account, no permission prompts, and no waiting on a network.
- Your calculations never leave your phone
- While you work, the only ad is one banner below the keypad
- Works offline from the first launch
- Rates reproduced from official GST notifications
How this differs from a web GST calculator
| Most apps | GST Calculator |
|---|---|
| Needs a connection every time | Works offline, which matters at a counter |
| Shows a rate with no source or date | Shows the date the rates came from |
| One calculation, then start again | A running bill for multi-item totals, plus your last 20 calculations |
| Covered in ads around the numbers | One banner below the keypad while you work, never over it |
| Claims to be official | States plainly that it is independent, and points at the official source |
Useful within a minute
Step 1: Enter the amount
Type the price. Choose whether GST should be added to it or extracted from it.
Step 2: Pick the rate
Tap a rate key to add GST, or one in the row below to take it out. Hold a key to change it to a rate you use often.
Step 3: Read the split
See the tax amount and the final total, with CGST and SGST split within a state or IGST across state lines.
And it also does
- A PDF tax invoice with your GSTIN, sent to WhatsApp or any app
- 0%, 5%, 18% and 40%, plus 3%, 0.25% and composition rates
- Four rate keys you set once
- HSN and SAC code search
- Reverse calculation from a total
- Markup and memory keys
- Your last 20 calculations
Questions
Can't find the answer you're looking for?
Is this a government app?
No. It's an independent app, not affiliated with, endorsed by, or representing the Government of India, the GST Council, or CBIC.
Are the rates current?
The app carries the GST 2.0 structure from September 2025 and shows the date its rates came from. Always confirm a rate at the official source before it goes on an invoice.
Can it make a GST invoice?
Yes. Add items with GT, tap CHK to check the bill, then Send as invoice. The app makes a PDF tax invoice with your business name and GSTIN, the invoice number, CGST and SGST or IGST and the total in words, and hands it to WhatsApp or any app you choose. It is made on your phone and never uploaded. Invoices from the free app end with a short line naming the app.
Does it file returns?
No. It calculates and informs. It doesn't file returns or provide any government service.
Is it free?
Yes. The calculator, every slab, both splits and the HSN lookup are free. Free keeps your last 20 calculations and one multi-item bill a day; watching a short ad, only if you choose to, unlocks another.
Does it show full-screen ads?
At most one, when you open the app from cold, and no more than once every four hours. Never on your first launch, and never during a calculation. While you work, the only ad is a banner below the keypad.
Where do I get it?
On Google Play, for Android. It needs no account and asks for no permissions, and works offline from the first launch.
GST Calculator is an independent app. It is not affiliated with, endorsed by, or representing the Government of India, the GST Council, or the Central Board of Indirect Taxes and Customs. Official rate sources: cbic-gst.gov.in and gstcouncil.gov.in.
Guides worth a look
- GST
CGST, SGST or IGST: which one goes on your invoice, and how to split it
Within a state, GST splits into equal CGST and SGST. Across state lines it is one IGST line at the full rate. How to tell which applies, with worked splits.
Read - GST
GST on gold jewellery: 3%, making charges, and how to check the bill
Gold jewellery carries 3% GST, a rate GST 2.0 left alone. How making charges are taxed, where the 5% rate applies, and how to check a jeweller's bill.
Read - GST
GST on a restaurant bill: how to check it's charged right
Most restaurants charge 5% GST, as 2.5% CGST and 2.5% SGST. When 18% is right, why service charge is optional, and how to check a bill in thirty seconds.
Read
