7 Low-Calorie, Low-Carb, & Sugar-Free Drinks At Sonic

At Sonic, there are many options to get you a low-calorie, low carb and sugar-free drink without any of the guilt and all of the flavor.

Here are the top 7 low-calorie, low-carb, and sugar-free drinks at Sonic:

  • Coca-Cola Zero (0 calories)
  • Diet Coke (0 calories)
  • Sprite Zero (0 calories)
  • Unsweetened iced tea (0 calories)
  • Diet Dr. Pepper (0 calories)
  • Diet Cherry Limeade (15 calories)
  • Diet Lime Limeade (5 calories)

All these drinks are all great low-calorie options, but there are many ways to customize your drinks at Sonic to reduce the calories even further, which I’ll explain below. 

What Makes A Drink Low Calorie, Low Carbohydrate, And Sugar-Free At Sonic?

To get a drink that falls into all three of these categories, you will need to order something using diet or ZERO soda as a base and sugar-free add-ins or real fruit add-ins.  

The diet and ZERO sodas as well as sugar-free add-ins use artificial sweeteners to give it flavor.  This is usually aspartame and acesulfame potassium (ace-K).  

Since there is no sugar added, this is what is going to keep the carbohydrates, and in turn, the calories down for you.

What Increases Calories In A Drink At Sonic?

When ordering a drink at Sonic, here a few ingredients that will increase the calories:

Full Sugar Drinks

Ordering full sugar drinks includes all non-diet or Zero sodas, iced tea, classic lemonade and limeade drinks. 

Flavor & Candy Add-Ins

Adding in full sugar flavor add-ins or candy add-ins will increase calories by 45 calories to 210 calories per serving.  

Trying a sugar free flavor add-in will decrease the added calories to 5 calories to 25 calories per serving.

Tips For Ordering Low-Calorie Drinks At Sonic

tips for ordering low calorie drinks at sonic

Here are a few tips to customize your drinks at Sonic without increasing calories, carbs, or sugar:

Use Sugar-Free flavor Add-Ins

Sonic offers some great options for adding sugar-free flavor to your drinks in order to keep calories down.  

When ordering a medium, sugar-free flavor add-ins may add anywhere from 0-20 calories per serving.

Here are my top picks for sugar-free add-ins: 

  • Blackberry Sugar-Free Add-in (5 calories)
  • Diet Cherry Sugar-Free Add-in (20 calories)
  • Lemon Add-In (5 calories)
  • Lime Add-In (5 calories)
  • Peach Sugar-Free Add-in (0 calories)
  • Raspberry Sugar-Free Add-In (5 calories)

Avoid RT 44 sizes

Ordering an RT 44 size (which is 44 ounces of liquid) will increase your caloric intake since it is the biggest size they offer.  

Pro tip: You can always ask for easy ice in a small or medium if you would like to increase the volume of drink slightly you are getting in your cup without sizing up.

Choose Diet or ZERO Soda Options As Your Base

To keep calories and carbs down, order a diet soda such as Diet Dr.Pepper or Diet Coke, or a ZERO option soda such as Coca-Cola ZERO or Sprite ZERO.  

All of these drinks are zero calories and zero carbs as well as sugar-free.  

Adding a sugar-free flavor add-in will give you additional flavor, as well while still keeping the carbs and calories to a minimum.

Add Lemon and Lime Fruit For Added Flavor

Instead of adding more flavor add-ins, choose lemon and/or lime fruit instead.  It will offer a crisp and refreshing citrus flavor without adding any sugar to your drink.

Low Calorie, Low Carbohydrate, and Sugar-Free Drinks At Sonic

1. Coca-Cola ZERO

Sonic Coca-Cola ZERO

A zero calorie, zero sugar soda option that can be transformed by adding sugar-free flavor add-ins.

SizeCalsCarbs (g)Sugar (g)

Pro Tip: Try adding Diet Cherry flavor Add-in.  This will only increase your calories to 5 calories total per serving.  You can get fancy and add a cherry fruit on top for an additional 10 calories, keeping your total drink calories to 15 calories total.

2. Diet Coke

If you prefer the flavor of Diet Coke over Coke Zero, this is another option for you to keep calories down.

Diet Coke
SizeCalsCarbs (g)Sugar (g)

Pro Tip: Add lime fruit to your Diet Coke to increase the citrus flavor without the calories.

3. Sprite ZERO

Sonic Sprite ZERO

A lemon and lime flavored soda to help you quench your thirst.  

SizeCalsCarbs (g)Sugar (g)

Pro Tip: Swap this as the option you select for any of the limeade beverages at Sonic in order to decrease calories, carbs, and sugar from Sprite that has 100-350 calories per serving.  You can also add a sugar-free Blackberry flavor to your Sprite ZERO, only increasing calories by 5.

4. Unsweet Iced Tea

Sonic Unsweet Iced Tea

This is a freshy brewed unsweet tea that is served over Sonic’s signature mini ice cubes.

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Pro Tip: Sweeten your tea up yourself by adding a sugar-free flavor add-in.  My favourite include adding in Sugar-Free Peach (0 calories) or Sugar-Free Mango (5 calories).  You can also simply add lemon fruit to your iced tea if you prefer an unsweet tea.

5. Diet Dr. Pepper

Sonic Diet Dr. Pepper

The guilt-free option is perfect for a cherry flavored treat.

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Pro Tip: Add some cherry fruit for added cherry flavor (10 calories each) or some additional cherry flavor with the Sugar-Free Cherry flavor add-in. 

6. Diet Cherry Limeade

A satisfying limeade made with real lime and diet cherry flavor in a Sprite ZERO base keeping your carbs and calories down.

SizeCalsCarbs (g)Sugar (g)

Pro Tip: Skip the Cherry fruit if you’d like to keep the calories down to a minimum (10 calories per cherry fruit) and increase the amount of fresh lime fruit added instead.

7. Diet Limeade

Sonic Diet Limeade

Sonic’s signature Limeade drink made with Sprite ZERO and freshly squeezed lime over ice.

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Pro Tip: Add Sugar-Free Raspberry Flavor Add-in fo an additional 5 calories per serving to add a little flair to your next Diet Limeade.

Drinks To Avoid At Sonic

Here are the top three drinks to avoid at sonic since they are the highest in calories.  

If you do want to drink them, however, I’ve give you a couple of ways to reduce the calories.  But honestly, they’re still fairly high calories even with the customization I recommend. 

1. Cherry Limeade (150-370 calories)

Sonic Cherry Limeade (150-370 calories)

Made with sweet cherry flavor, cherry fruit, lime in a Sprite base over ice.

SizeCalsCarbs (g)Sugar (g)

To reduce calories, swap for diet cherry flavor, fresh lime, in a Sprite ZERO base instead to reduce to 5 calories.

2. Cranberry Limeade (140-360 calories)

Sonic Cranberry Limeade

Made with real lime, cranberry flavor in a Sprite base over ice.

SizeCalsCarbs (g)Sugar (g)

To reduce calories, keep the lime and swap for Sprite ZERO and easy cranberry flavor to reduce to 35 calories instead.

3. Strawberry Limeade (130-340 calories)

Sonic Strawberry Limeade (130-340 calories)

Limeade with real lime and strawberry in a Sprite base over ice.

SizeCalsCarbs (g)Sugar (g)

To reduce calories, swap for Sprite Zero and ask for easy Strawberry to reduce to 25 calories instead.

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About The Author

Caryn Watt

Caryn Watt is a certified personal trainer & nutrition coach. Working primarily with women all over the world, she focuses her time on helping clients learn more about nutrition and the importance of improving their relationship with food through tracking macros, movement, and mindfulness.