About this tool
The Bill Split Calculator divides a group bill among any number of people after adding tax and tip. In even mode, everyone pays the same share; in itemized mode, each person is charged for what they ordered, with the shared tax and tip distributed in proportion to each person's item subtotal. It handles the details a plain tip calculator ignores: multiple people, a separate tax rate, and uneven per-person orders.
Tax is computed as tax = subtotal × tax% ÷ 100. Tip is applied to a base you choose — the pre-tax subtotal (the customary base) or the post-tax amount — as tip = base × tip% ÷ 100. The grand total is subtotal + tax + tip. For the even split, the grand total in cents is divided as equally as possible and any leftover cents are assigned one at a time so the shares add up to the total exactly. In itemized mode each person's share is total × (their subtotal ÷ combined subtotal), again reconciled to the cent so no penny is lost or invented.
All math runs locally in your browser and amounts use your locale's formatting. Switch the tip base to post-tax if your group tips on the after-tax figure, adjust the number of people for an even split, or add a row per person and enter what each ordered for a fair itemized split. The per-person table always sums back to the grand total shown above it.