How many carbs are in a Big Mac?

A Big Mac has about 45g of carbs (44g net). Full breakdown of the bun, sauce, patties, and how it compares to other McDonald's burgers.

Written by

Carb Lens Editorial

Nutrition writers & product team

Medically reviewed by

Dr. Alicia Nguyen, RD, CDCES

Registered Dietitian · Certified Diabetes Care & Education Specialist · 12+ years clinical experience

Published May 24, 2026 4 min readEditorial policy

A standard McDonald's Big Mac has 45g of total carbohydrates, with about 3g of fiber, putting net carbs at roughly 42g. It also packs 563 calories, 33g of fat, and 26g of protein.

Where the carbs come from

**The bun (top, middle, bottom)**: ~39g — by far the biggest source. The three-piece sesame bun is the defining feature of a Big Mac and also its biggest carb contributor.
**Big Mac Sauce**: ~3g — the sauce contains relish and a touch of sugar.
**Pickles, onion, lettuce, cheese, beef patties**: ~3g combined.

How it compares

Burger	Carbs
Big Mac	45g
Quarter Pounder with Cheese	42g
Cheeseburger	33g
McDouble	34g
Hamburger	32g

Lower-carb hacks

Order it **without the middle bun** ("Big Mac, no club bun") — drops carbs by ~13g.
Get it **protein style** (lettuce wrap) at locations that allow modifications — drops to under 10g.
Skip the fries: a medium fry adds another 43g.

Glucose impact

The Big Mac has a moderate glycemic load. Paired with fries and a regular soda, a full meal can push past 130g of carbs — enough to spike most people 80–120 mg/dL. Diet soda or water keeps the meal in the 45–50g range.

About the author

Carb Lens Editorial — Nutrition writers & product team. The Carb Lens editorial team writes practical, source-checked guides on carbs, blood sugar, and everyday nutrition. Every article is drafted by our writers and cross-referenced against USDA FoodData Central and peer-reviewed clinical guidelines.

How we source and review this article

Nutrition figures come from the USDA FoodData Central database. Blood-sugar and glycemic-load framing follows guidance from the American Diabetes Association and World Health Organization healthy-diet recommendations. Every article is medically reviewed by Dr. Alicia Nguyen, RD, CDCES before publishing and re-checked on a rolling basis. See our full editorial & medical review policy.

This article is for general information and is not a substitute for medical advice. If you're managing diabetes or another condition, always defer to your care team.