Limes are a kitchen staple in cuisines around the world, prized for their bright, tangy juice and aromatic zest. While they aren't a major source of iron, they contribute a small but real amount of this essential mineral — and their abundant vitamin C actually helps your body absorb iron from other foods you eat in the same meal. This calculator estimates the iron content of limes based on how many you eat, their size, and whether you consume the whole fruit or just the juice.
The tool is handy for anyone tracking daily micronutrients, meal planning around iron intake, or simply curious about the nutritional profile of their favorite citrus. Results are based on USDA reference values for raw limes and lime juice, and are shown in milligrams plus a percentage of the adult Daily Value. Quick-fill buttons make estimates instant — no nutrition degree required.
🧮 Lime Iron Calculator
Estimate the iron you get from fresh limes based on quantity, size, and how you eat them.
Quick Start
Using the calculator takes about ten seconds. Enter the number of limes you ate or plan to use, select a size (small, medium, or large), and choose what part of the fruit you actually consumed — the whole edible fruit (flesh, pulp, and juice) or just the juice. Hit Calculate and you'll get the total edible weight, the iron content in milligrams, and how much of the adult Daily Value that represents.
The edible weights behind the size options come from standard USDA serving data: a small lime provides about 40 g of edible flesh, a medium lime about 50 g, and a large lime about 60 g. If you're weighing limes on a kitchen scale instead, think of the result as roughly 0.11 mg of iron per 100 g of whole lime flesh.
The Math Behind the Estimate
The calculator applies iron values published in the USDA FoodData Central database: raw lime edible portion (flesh, pulp, and juice) contains 0.11 mg of iron per 100 g, while raw lime juice contains 0.09 mg per 100 g. The formula is simple:
Total iron (mg) = number of limes × edible weight per lime (g) × iron per 100 g ÷ 100
Two medium limes eaten whole, for example, give you 2 × 50 g = 100 g of edible fruit. At 0.11 mg per 100 g, that works out to 0.11 mg of iron. The Daily Value shown in the results uses the FDA's adult reference of 18 mg of iron per day, so 0.11 mg represents about 0.6% of your daily need.
Worked Examples
Example 1 — A lime wedge with your meal. One medium lime squeezed over fish contributes 50 g × 0.09 mg/100 g = 0.045 mg of iron, about 0.3% of the Daily Value. Modest in iron, but the vitamin C boost helps you absorb iron from the rest of the plate.
Example 2 — Two limes blended into a smoothie. Using the whole peeled fruit: 2 × 50 g = 100 g → 0.11 mg of iron. Still small, yet if your smoothie includes spinach or oats, the lime's vitamin C improves absorption of the iron already in those ingredients.
Example 3 — Fresh limeade from four limes. Four medium limes yield about 200 g of juice: 200 × 0.09 ÷ 100 = 0.18 mg of iron, roughly 1% of the Daily Value. Not significant alone, but a smart pairing with a leafy meal.
Lime Nutrition at a Glance
The table below summarizes the key nutrients in raw limes per 100 g and per medium lime (about 50 g of edible flesh), based on USDA data:
| Nutrient | Per 100 g whole lime | Per medium lime (~50 g) |
|---|---|---|
| Iron | 0.11 mg | 0.055 mg |
| Vitamin C | 29.1 mg | ~14.6 mg |
| Calories | 30 kcal | ~15 kcal |
| Carbohydrates | 10.5 g | ~5.3 g |
| Fiber | 2.8 g | ~1.4 g |
| Water | ~88% | — |
For the complete nutrient profile, search "limes, raw" in the USDA FoodData Central database.
Tips for Getting More Iron from Lime-Based Meals
Pair lime with plant iron. The vitamin C in lime (about 29 mg per 100 g) can increase absorption of non-heme iron from beans, lentils, spinach, and tofu by two to three times when eaten in the same meal. A squeeze of lime over a bean salad or lentil curry is one of the easiest dietary iron tricks there is.
Use fresh lime in marinades. Acidity helps release iron from leafy greens and legumes during cooking. Finishing dishes with fresh lime rather than bottled juice also preserves more vitamin C, since light and heat degrade it over time.
Mind the absorption blockers. Tea and coffee contain tannins that reduce non-heme iron absorption when drunk with meals. If iron is a concern, have your tea an hour before or after eating — and keep the lime juice at the table.
Frequently Asked Questions
Are limes a good source of iron? Not on their own — a whole medium lime provides roughly 0.055 mg, well under 1% of the adult Daily Value. Their real value for iron status is the vitamin C they supply, which boosts absorption of iron from other plant foods in the same meal.
Does whole lime or lime juice contain more iron? Whole lime flesh contains slightly more iron per gram (0.11 vs 0.09 mg per 100 g) because the pulp and membranes hold more mineral than the clear juice. In practice the difference is tiny — both provide trace amounts.
What is the Daily Value for iron? The FDA sets the reference Daily Value at 18 mg per day for adults. Individual needs vary: pregnant women need about 27 mg per day, menstruating women typically need more than men, and people with diagnosed deficiency require higher therapeutic doses under supervision. See the NIH Iron fact sheet for health professionals for details.
Can you eat lime peel for iron? Technically yes — lime peel contains more iron than the flesh (around 0.6 mg per 100 g) — but few people eat whole peel. Grated zest adds flavor and a trace of minerals to dressings, baked goods, and marinades.