Use in Moderation
Marinara Sauce
7.00g net carbs per 1/2 cup
Those 7 g net carbs per half cup add up fast, since most pasta-sized portions run double that. Watch for jars with added sugar, stick to a quarter-cup drizzle, and you can keep it in the rotation without blowing your daily budget.
Built by Barron Hansen · Last updated July 2026
Nutrition Facts
Fits My Daily Budget?
Set your daily net carb limit to see how one serving fits.
One serving uses 35% of your 20g daily budget.
Plan the rest of your day
Good to Know
Tomatoes carry natural sugar, and many jarred sauces pile on more, so check the label for added sugar and aim for sauces that list only tomatoes, oil, and herbs. Rao's Homemade Marinara is a common pick because it skips added sugar and runs lower in carbs than sweeter brands like Prego or Ragú. Watch out for hidden starches and thickeners too, since some sauces add cornstarch or sugar to balance acidity.
Is Marinara Sauce Keto? The Full Answer
Marinara Sauce contains 7.00g net carbs per 1/2 cup (9.30g total carbs minus 2.30g fiber). Those 7 g net carbs per half cup add up fast, since most pasta-sized portions run double that. Watch for jars with added sugar, stick to a quarter-cup drizzle, and you can keep it in the rotation without blowing your daily budget.
On a standard ketogenic diet, most people target 20-25g net carbs per day. A single serving uses 35% of a 20g daily carb limit. Track your portions carefully and account for other carbs in your meals.
Better Keto Swaps
Marinara is one of those sauces that sneaks up on you. A half cup runs 7 g net carbs, mostly from the tomatoes and any added sugar, so it adds up fast over a plate of zoodles. Here are a few ways to keep the flavor and cut the carbs. First, an alfredo or other cream-based sauce. A typical 1/4 cup pours in around 1 to 2 g net carbs, and the fat fits keto neatly while still coating noodles like you want. Second, a no-sugar-added marinara such as Rao's Homemade. Because it skips the added sugar, a 1/2 cup lands closer to 4 g net carbs, a real drop from the standard 7 g. Third, basil pesto. A 1/4 cup sits around 2 to 3 g net carbs, and the olive oil plus pine nuts give you a bright, herby option when you want a change from red sauce.
Track Your Ketone Levels
The Keto-Mojo meter is the gold standard for confirming you're actually in ketosis. Know your numbers - don't guess.