Homemade pizza is one of the trickiest meals to track because every component contributes carbs in a different way. Here's the practical method we use inside Carb Lens to estimate net carbs per slice — and a worked example you can copy.
The four sources of carbs in a pizza
A typical homemade pizza has four carb sources:
- The dough — by far the largest contributor (50-75% of total carbs).
- The sauce — small but not negligible (3-5g per pizza for a thin layer).
- The cheese — almost zero carbs in real mozzarella, but processed blends can add a gram or two.
- The toppings — vegetables, meats and sweet sauces like BBQ all stack up.
Step 1: weigh the dough
Most carbs come from the flour. A standard 12-inch pizza dough uses about 250g of all-purpose flour, which is roughly 190g of carbs. After fermentation the carb count barely changes, so you can use the raw flour weight as your baseline.
If you're using a recipe with sugar, oil, or milk, add those too: a tablespoon of sugar is 12g of carbs, a cup of milk is 12g.
Step 2: count the sauce
Two-thirds of a cup of canned tomato sauce is about 12g of carbs. Pizza sauce with added sugar can be 15-18g for the same volume. Read the label — and divide by the number of slices.
Step 3: account for toppings
Per typical serving on a 12-inch pizza:
- Pepperoni, sausage, bacon, mushrooms, peppers: 0-2g per pizza
- Caramelized onions: 4-6g per pizza
- Pineapple: 12-15g per pizza
- BBQ chicken with sauce: 18-25g per pizza
- Olives, basil, arugula, jalapeños: essentially 0g
Step 4: divide by slices and subtract fiber
A 12-inch pizza is usually 8 slices. Add everything up, divide by 8, and subtract about 1g of fiber per slice (more for whole-wheat dough).
Worked example: classic Margherita
- Dough (250g flour): 190g carbs
- Sauce (½ cup): 9g
- Fresh mozzarella (200g): 2g
- Basil + olive oil: 0g
Total: 201g carbs ÷ 8 slices ≈ 25g per slice, or about 24g net carbs.
The faster way
If weighing and adding gets tedious, snap a photo of the slice in the Carb Lens scanner — the AI estimates net carbs in about a second by recognising crust thickness and toppings. It won't beat a kitchen scale for precision, but it's usually within 2-3g and takes no math.