GST Calculator
From WebStudio — a free PaperOS tool. No login, no uploads, no watermark.
Free forever · works offline · your files never upload.
| Price | Free forever |
|---|---|
| Login | None |
| Offline | Yes, after first load |
Shopkeepers, freelancers and students use this every day: type an amount, pick a slab, and see base price, GST and total instantly — including reverse (GST-inclusive) math. Open GST Calculator now →
How to use it
- Enter the amount in rupees.
- Tap your GST slab — 0, 5, 12, 18 or 28%.
- Switch between Add GST and Remove GST.
- Copy the breakup straight into your bill or quotation.
Why people pick PaperOS
- All Indian GST slabs built in
- Reverse calculation for MRP math
- Pairs with Invoice Maker and Quotation
- Works offline at the shop counter
Questions
How is GST removed from a total?
Base = total × 100 ÷ (100 + rate). The tool does it instantly in Remove GST mode.
Which rate should I use?
Most services are 18%. Goods vary by HSN — check your invoice or ask your CA for your category.
Can I make a full GST bill?
Yes — Invoice Maker builds CGST+SGST/IGST bills with HSN, discount and amount-in-words.
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