About onGST Calculator
Fast, private, and transparent tax utilities for India
Who We Are
onGST Calculator is a dedicated, fast, and free web utility designed to simplify Goods and Services Tax (GST) calculations for Indian small businesses, freelancers, accountants, students, and everyday consumers.
What We Offer
- GST Calculator — instantly add or remove GST from any amount, with automatic CGST/SGST (intra-state) or IGST (inter-state) breakdowns.
- GST Late Fee & Interest Calculator — estimate GSTR-3B and GSTR-1 late filing penalties and interest under Section 50, for both Regular and NIL returns.
- Up-to-date rate structure — reflects the simplified GST 2.0 slabs (5%, 18%, and 40%) effective from the September 2025 GST Council reforms.
- Clear GST Rates reference and an educational guide explaining how GST, CGST, SGST, and IGST work in practice.
Our Mission
Our mission is to provide clean, instant, and transparent tax calculation tools without intrusive ads, mandatory user registration, or paid paywalls. We built this site because we believe everyday GST calculations — for an invoice, a late return, or just understanding a bill — shouldn't require downloading an app, creating an account, or wading through clutter.
Our Commitment to Accuracy
We work to keep our calculators aligned with the latest GST Council and CBIC notifications. That said, GST rules can be complex and subject to change — for anything filing-critical, we always encourage cross-checking with the official GST Portal or a qualified Chartered Accountant.
Who It's For
Whether you're a shop owner calculating GST on a sale, a freelancer invoicing a client, an accountant double-checking a late fee, or a student learning how GST works — this tool is built to give you a fast, no-friction answer.
Get in Touch
Have feedback, spotted an error, or have a feature you'd like to see? We'd love to hear from you — visit our Contact Us page or email us directly at support@ongstcalculator.com.