How Many Limes for 1 Cup Juice Conversion
1 medium lime = 2 tbsp juice. Need 8 limes for 1 cup.
A medium lime yields about 2 tablespoons of juice. You need 8 limes for 1 cup.
Lime size varies wildly. Persian limes (the common green ones at grocery stores) range from 1.5 to 3 ounces. Key limes are half that size. A 2-ounce lime gives you 2 tablespoons of juice if you squeeze it properly. A barely-ripe 1.5-ounce lime might give you 1 tablespoon. An overripe 3-ounce lime can yield 3 tablespoons.
Most recipes that call for lime juice mean freshly squeezed. Bottled lime juice tastes metallic and lacks the bright acidity that makes fresh juice worth the effort. The conversion math is simple: 1 cup = 16 tablespoons. If each lime gives 2 tablespoons, you need 8 limes.
How to Convert
Count 2 tablespoons of juice per medium lime. For 1 cup (240ml), buy 8-10 limes to account for duds.
Room temperature limes yield 20-30% more juice than cold ones. Microwave cold limes for 10 seconds before squeezing. Roll each lime on the counter with firm pressure to break the internal membranes. This releases more juice.
Cut limes crosswise, not lengthwise. Use a citrus reamer or fork to extract juice. A handheld citrus press extracts the most juice with minimal effort. Strain out pulp and seeds if the recipe requires it.
Common Mistakes
Buying exactly 8 limes when you need 1 cup of juice. At least one will be dry inside. Buy 10-12 for insurance. Using cold limes straight from the fridge cuts juice yield by 25%. Let them reach room temperature first. Cutting limes lengthwise instead of crosswise. The crosswise cut exposes more juice sacs to pressure. Lengthwise cuts look prettier for garnish but yield less juice. Substituting bottled juice at a 1:1 ratio. Bottled juice is more concentrated. Use 3/4 cup bottled for every 1 cup fresh if you must substitute.
Pro Tips
Choose limes that feel heavy for their size. Light limes are dry inside. The skin should give slightly under pressure but spring back. Rock-hard limes are underripe. Mushy spots mean overripe.
Freeze extra juice in ice cube trays. Each cube holds 2 tablespoons. Transfer frozen cubes to a freezer bag. They keep for 3 months. Thaw what you need.
For cocktails, juice limes hours ahead and refrigerate. The flavor mellows slightly. For marinades and dressings, juice right before using for maximum brightness.
Ingredient-Specific Notes
Persian limes
The standard grocery store lime. Average weight 2 ounces, yield 2 tablespoons juice. Seedless or nearly seedless. Available year-round. Peak season is May through October when they're juiciest and cheapest at $0.33-0.50 each.
Key limes
Half the size of Persian limes. Average weight 1 ounce, yield 1 tablespoon juice. More acidic and floral than Persian limes. Essential for authentic key lime pie. Sold in 1-pound bags containing 20-25 limes. One bag yields about 1 cup juice.
Bottled lime juice
Contains preservatives that give a metallic taste. Use 3/4 cup bottled for 1 cup fresh in marinades where other flavors dominate. Never substitute in cocktails or key lime pie. ReaLime and Nellie & Joe's are common brands.
Lime zest
The green outer peel contains aromatic oils. One medium lime yields 1 teaspoon zest. Zest before juicing. A microplane works best. Avoid the white pith underneath, which tastes bitter.
Frozen limeade concentrate
Not a direct substitute for fresh juice. Contains added sugar and water. A 12-ounce can equals about 1.5 cups when reconstituted. Use only in punches and marinades where sweetness works.
Frequently Asked Questions
How many key limes equal 1 cup of juice?
About 20-25 key limes for 1 cup. Each key lime yields 1 tablespoon of juice compared to 2 tablespoons from a Persian lime. Key limes are sold in 1-pound mesh bags. One bag typically yields 0.75 to 1 cup of juice. Buy 2 bags to be safe. The extra effort pays off in key lime pie where the floral, less acidic flavor makes a noticeable difference.
Can I use bottled lime juice instead of fresh?
Fresh tastes better, but bottled works in marinades and cooked dishes. Use a 3:4 ratio since bottled juice is concentrated. For 1 cup fresh, use 3/4 cup bottled. Never substitute in cocktails, ceviche, or key lime pie where fresh juice is essential. Bottled juice contains sodium benzoate and sulfites that create an off-flavor. The $3 price difference isn't worth ruining a margarita.
Why do some limes have no juice?
Underripe limes feel rock-hard and yield minimal juice. They're picked green for shipping but need time to develop juice. Overripe limes get spongy and dry out from the inside. Choose limes that feel heavy with skin that yields slightly to pressure. Avoid any with soft spots or wrinkled skin. Store limes in the crisper drawer where they keep for 3-4 weeks.
How much juice is in a pound of limes?
One pound of Persian limes (5-6 limes) yields 6-8 tablespoons or about 1/2 cup juice. Weight varies by season and growing region. Mexican limes in summer average 2.5 ounces each and are juicier. Florida limes in winter average 1.8 ounces and are drier. For recipes needing exact amounts, buy limes by count rather than weight. Ten medium limes reliably yield 1 cup.
What's the best tool for juicing limes?
A handheld citrus press extracts 90% of available juice with minimal effort. The $15 investment pays for itself quickly. Manual reamers work but require more pressure and time. Electric juicers are overkill unless you're making drinks for 20+ people. In a pinch, squeeze by hand or use a fork to twist out juice. Whatever method you use, room temperature limes yield 25% more juice than cold ones.