Add GST when you have a base price and need the invoice total. Remove GST when you have an inclusive price — a shop bill, say — and need to know how much of it was tax. The two are not the same operation, which is the most common mistake people make here.
This works as a GST calculator and a VAT calculator. Set any rate: 18% Indian GST, 20% UK VAT, 10% Australian GST, 15% New Zealand GST, 9% Singapore GST, 5% GST in Canada or 5% VAT in the UAE and Saudi Arabia. Pick your country from the header and the amounts appear in your own currency. The CGST and SGST breakdown is shown only for India, because that split exists nowhere else.
5% — essential goods, packaged food, economy transport, small restaurants.
12% — processed food, business-class air travel, some apparel and household goods.
18% — the standard slab covering most services, electronics and financial products.
28% — luxury and demerit goods such as cars, tobacco and aerated drinks, often with an additional cess.
CGST, SGST or IGST? Same state — the tax splits equally into CGST for the Centre and SGST for the State. Different states — the whole amount is one IGST levy. Use the supply-type switch to see both.
United Kingdom — VAT 20%. A reduced 5% rate applies to domestic energy and some home improvements, and food, children's clothing and books are zero-rated.
European Union — VAT 17–27%. Standard rates vary by member state: 19% Germany, 20% France, 21% Netherlands and Spain, 22% Italy, 27% Hungary.
Australia — GST 10%. Flat, with basic food, most health care and education GST-free.
New Zealand — GST 15%. Applied very broadly with almost no exemptions.
Singapore — GST 9%. Raised from 8% in 2024.
Canada — GST 5%, or HST 13–15%. Some provinces combine the federal GST with provincial sales tax into a single harmonised rate.
UAE and Saudi Arabia — VAT 5% and 15%.
United States. No national VAT. Sales tax is set by state and city, typically 0–10%, and is added at the till rather than included in the shelf price — so the "Add" mode is the one you want.
Why can't I just subtract the percentage? Because the tax was calculated on the base, not on the total. Taking 18% off an inclusive ₹11,800 gives ₹9,676, but the correct base is ₹10,000. The Remove mode divides rather than subtracts.
Does this include cess or surcharges? No. Certain Indian 28% items carry an extra compensation cess (on cars and tobacco, for example) that varies by product. Local surcharges elsewhere are likewise not modelled.
Can I use it for sales tax or a service charge? Yes. Any single-rate tax added to or included in a price works the same way — enter the rate and pick the mode.
