Nutrition Breakdown

Onion Calories — Lowest to Highest

Browse calorie values for Onion menu items, with official nutrition where available and estimated calories for uncovered items. Updated July 2026.

Coverage

100%

Average Calories

280 kcal

Lowest Item

31 kcal

Highest Item

465 kcal

24 / 24 items resolved USDA database: 18 Estimated: 6

Lowest Calorie Items at Onion

Use this ranking to find lighter menu options quickly

Full menu →
# Item Category Source Calories
1 The Caliente specialty pizzas USDA 31 kcal
2 The Jerk Chicken specialty pizzas USDA 56 kcal
3 The Carnivore specialty pizzas USDA 109 kcal
4 The Hawaiian specialty pizzas USDA 209 kcal
5 The BBQ Chicken specialty pizzas USDA 219 kcal
6 The Margherita specialty pizzas USDA 219 kcal
7 The Veggie specialty pizzas USDA 224 kcal
8 The Italian specialty pizzas USDA 225 kcal
9 The Bacon Cheeseburger specialty pizzas USDA 248 kcal
10 Calzones calzones USDA 249 kcal
11 The Uberoni specialty pizzas USDA 254 kcal
12 The Chicken George specialty pizzas USDA 267 kcal
13 The Mediterranean specialty pizzas USDA 277 kcal
14 Delivery Special delivery special USDA 295 kcal
15 12 Rolls pizza rolls USDA 345 kcal
16 4 Rolls pizza rolls USDA 345 kcal
17 8 Rolls pizza rolls USDA 345 kcal
18 Drinks drinks Estimated 390 kcal
19 Garden salads Estimated 390 kcal
20 Greek salads Estimated 390 kcal
21 The Queso Fantastico specialty pizzas Estimated 390 kcal
22 The Supreme specialty pizzas Estimated 390 kcal
23 Toppings toppings Estimated 390 kcal
24 Slices specialty pizzas USDA 465 kcal
Nutrition sync is temporarily paused Missing official items: 6

Highest Calorie Items

Top calorie-dense picks based on current nutrition data

Slices

specialty pizzas 465 kcal

Drinks

drinks 390 kcal

Garden

salads 390 kcal

Greek

salads 390 kcal

The Queso Fantastico

specialty pizzas 390 kcal

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How Estimated Calories Are Calculated

When official nutrition is unavailable, calorie values are estimated using menu-item keywords and then adjusted by portion size. These values are directional for comparison, not medical nutrition advice.

  • Base estimate: item-name tokens (for example burger, fries, salad, pizza, shake) map to baseline calorie ranges.
  • Portion weighting: ounce and gram values adjust the estimate (about 8 oz = 1.0x, about 230 g = 1.0x), then the value is capped within a safe range.
  • Size modifiers: small/kids items apply a lower multiplier, while large/xl/family/double items apply a higher multiplier.
  • Final output: estimates are rounded to whole calories and shown as Estimated in the source column.

Onion Calories — Frequently Asked Questions

Questions about calorie values, estimates, and nutrition coverage.

How many Onion items have calorie data?
Onion currently has calorie values for 24 of 24 menu items (100% coverage). We first use official nutrition sources when available, then apply estimation fallback for unresolved items.

What is the lowest-calorie item at Onion?
The lightest item currently tracked is The Caliente at approximately 31 kcal. Use the ranked table to find other low-calorie meal choices.

Are Onion calorie values official or estimated?
This page uses a hybrid model: 18 items use USDA database estimates, while 6 items are algorithmic estimates. Both are directional for comparison, not medical guidance.

Where can I compare calories and prices together?
Use the Onion full menu prices page for price-focused browsing and the cheapest menu items page for budget picks. This calories page is built for nutrition-first filtering.

How to Use This Calories Page

Use this page to compare low-calorie and high-calorie items quickly before ordering. Official values are used where available, and estimated values fill the coverage gap for broad menu discovery.

Estimated values are directional and may vary by location, preparation style, and serving size. For strict dietary planning, cross-check with the official restaurant nutrition statement when available.