There are 270 calories in a Onion Bun from Red Robin. Most of those calories come from carbohydrates (67%).
To burn the 270 calories in a Onion Bun, you would have to run for 24 minutes or walk for 39 minutes.
Let us know what you think! Review the nutrition facts above and then vote on whether you think a Onion Bun is healthy or not.
There are 6 Weight Watchers Freestyle Points, 8 WW SmartPoints and 7 WW PointsPlus in a serving of Onion Bun from Red Robin.