How Many Calories in a Lime? Nutrition Facts & Macros

One whole lime (67 g) contains about 20 calories. Per 100 g, limes have 30 calories — among the lowest of all fruits. A tablespoon of lime juice (15 ml) has roughly 4 calories, making it an essentially zero-calorie way to add flavor. The calories come primarily from carbs (10.54 g per 100 g), with negligible protein (0.7 g) and almost no fat (0.2 g). Limes are ideal for adding bright, tangy flavor without adding meaningful calories to any dish.

Limes are packed with vitamin C — 29.1 mg per 100 g (32% DV) — a powerful antioxidant that supports immune function, collagen synthesis, and iron absorption. They also provide 2.8 g of fiber per 100 g, potassium (102 mg), and calcium (33 mg). The citric acid in limes may improve mineral absorption and help prevent kidney stones. Lime juice has antibacterial properties and has been used historically to purify water. At only 30 calories per 100 g, limes are one of the most nutrient-efficient fruits you can eat.

Limes are one of the most keto-compatible fruits. One whole lime (67 g) contains about 7.1 g total carbs and 1.9 g fiber, giving roughly 5.2 g net carbs. A tablespoon of lime juice adds only 0.8 g net carbs — practically free on keto. Use lime juice to flavor water, marinades, and dressings without breaking ketosis. The vitamin C (29.1 mg per 100 g) is especially valuable on keto, where fruit intake is limited and vitamin C sources are fewer.

Limes and lemons are closely related but differ in several ways. Nutritionally per 100 g: limes have 30 kcal, 10.54 g carbs, and 29.1 mg vitamin C, while lemons have 29 kcal, 9.32 g carbs, and 53 mg vitamin C. Lemons are slightly higher in vitamin C but both are excellent sources. Limes tend to be smaller, with thinner skin and a more bitter, aromatic flavor. Lemons are more acidic and sour. In cooking, limes dominate in Mexican, Thai, and Vietnamese cuisine, while lemons are preferred in Mediterranean and European dishes.

Whole limes last about 1 week at room temperature and 3 to 4 weeks in the refrigerator. For maximum freshness, store them in a sealed plastic bag in the fridge — this prevents moisture loss that makes limes hard and dry. Cut limes should be wrapped tightly and used within 3 to 5 days. Lime juice freezes well in ice cube trays for up to 6 months, and lime zest can be frozen in airtight containers for up to 3 months. Choose limes that feel heavy for their size with smooth, glossy skin.