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Service Charge & GST Calculator (++)
Free ++ calculator for Singapore: add the 10% service charge and 9% GST to menu prices (19.9% more), work back from a final bill, and split it between friends.
Your bill
You actually pay
S$119.90
| Menu price | S$100.00 |
| Service charge (10%) | S$10.00 |
| GST (9%) on food + service | S$9.90 |
| Total | S$119.90 |
| Extra over the menu price | 19.90% |
"++" means the price doesn't yet include the service charge and GST. GST (9%) is charged on the food and drinks and on the service charge too, so with a 10% service charge you pay 19.90% more than the menu price. Service charge isn't a government charge: each restaurant sets its own, and hawker centres and most cafés don't add one. If a price display looks unclear, ask before you order.
Rules last checked October 2026. Not legal, tax or financial advice. 🔒 Everything stays on your device.
✅ Rules last checked:
📚 Official sources: IRAS: GST
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
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Questions people ask
What does ++ mean in Singapore?+
The price doesn't include service charge and GST. With 10% service charge and 9% GST you pay 19.9% more: S$100 becomes S$119.90.
Is GST charged on the service charge?+
Yes. GST applies to the food and drinks and to the service charge.
Is service charge compulsory?+
It isn't a government charge. Each restaurant sets its own; hawker centres and most cafés don't add one.