How Many Diced Tomatoes In a Can? | Can-Size Guide

A standard 14.5-ounce can of diced tomatoes yields about 1.5 cups undrained, or roughly 5–6 small to medium fresh tomatoes.

You probably know the feeling. You’re standing in the kitchen, recipe on the counter, and it calls for diced tomatoes. The can in your hand reads 14.5 ounces, and you start wondering how that compares to the fresh tomatoes sitting in the bowl. It’s a simple question with a straightforward answer — once you know a few standard measurements used across most recipes.

A 14.5-ounce can is the most common retail size for diced tomatoes, and it holds roughly 1.5 cups of undrained product. That translates to about five or six small to medium fresh tomatoes, depending on their size. Knowing this conversion helps when you’re scaling recipes, substituting fresh produce, or just trying to make sense of what’s in your pantry without guesswork.

Standard Can Sizes and Their Cup Yields

The 14.5-ounce can is your baseline for most diced-tomato recipes. It yields approximately 1.5 cups of undrained product. That’s enough for a standard pot of chili, a batch of salsa, or a hearty pasta sauce.

Larger cans exist too. A 28-ounce can of diced tomatoes yields about 3 cups. A 15-ounce can also lands at roughly 1.5 cups. If you’re working with a 10.5-ounce can, expect about 1.25 cups. These sizes cover most recipe needs.

Canned tomato products vary widely beyond diced. Tomato paste comes in 6-ounce and 12-ounce cans, yielding 0.75 and 1.5 cups respectively. Tomato sauce ranges from small 4-ounce cans (0.5 cup) up to 29-ounce cans (3.5 cups). Tomato juice can hit 46 ounces, yielding roughly 5.75 cups. Condensed tomato soup, a staple for many recipes, comes in at 10.5 ounces and yields about 1.25 cups.

Why This Can Size Question Sticks

It’s easy to assume all cans are the same, but they’re not. Recipe writers often assume you know which size they mean, and that can trip up home cooks. Knowing the exact yield of a 14.5-ounce can keeps your dish balanced whether you’re doubling a recipe or scaling down.

• Recipe scaling gets easier: If a recipe calls for one 14.5-ounce can and you only have a 28-ounce can, knowing the cup yield helps you adjust without throwing off the liquid balance.
• Substitution confidence improves: When fresh tomatoes are in season and you’d rather use those, knowing that 5–6 tomatoes replace one standard can takes the guesswork out.
• Grocery planning saves time: You can match can sizes to specific recipes and avoid buying more than you need. No more half-used cans languishing in the fridge.
• Nutritional tracking gets more accurate: If you’re logging sodium or calories, knowing the exact volume per can lets you calculate per-serving values more reliably.
• Waste reduction becomes simpler: When you know exactly how much a can yields, you can plan recipes that use every last bit without leftovers.

These conversions might seem like small details, but they add up. A half-cup difference in liquid can turn a stew into soup or leave a sauce too thick. Getting the measurement right from the start saves you from mid-recipe adjustments.

How Many Fresh Tomatoes Equal a Can of Diced Tomatoes

A 14.5-ounce can of diced tomatoes contains about 5 to 6 small to medium fresh tomatoes. The exact number depends on tomato size and variety. Roma tomatoes tend to be smaller and meatier, so you might need closer to 6. Beefsteak tomatoes are larger, so 4 might do the job.

Redgoldtomatoes confirms the standard at 14.5 ounces on its standard 14.5 ounce can product page, noting this is the most common retail size. The company’s specification sheet makes clear that this size yields roughly 1.5 cups. That cup measurement is what most recipes rely on.

For a 28-ounce can, the fresh-tomato count roughly doubles to about 10 to 12 small or medium tomatoes. A 15-ounce can stays close to the 14.5-ounce baseline at around 5 to 6 tomatoes. The math stays proportional across sizes.

Fresh Tomato Count by Can Size

These fresh equivalents assume standard-sized Roma or globe tomatoes. If you’re using cherry tomatoes or oversized heirlooms, adjust the count accordingly. The cup yield from the can is always the more reliable starting measurement when precision matters.

How to Substitute Fresh Tomatoes for Canned

Swapping fresh tomatoes for canned is straightforward once you know the yield. The main difference is moisture content and seasoning. Canned tomatoes are packed in juice, while fresh tomatoes release their own liquid during cooking. Here’s how to make the switch without throwing off your recipe.

1. Choose your can size: Start by identifying what the recipe calls for. If it says one 14.5-ounce can, that’s your target. If it lists cups, use 1.5 cups as your goal for that size.
2. Dice and measure: Dice 5 to 6 medium fresh tomatoes and measure out 1.5 cups. For a more accurate match, let the diced tomatoes sit for a few minutes and drain off some excess liquid.
3. Adjust the liquid: Fresh tomatoes release more water than canned ones. If your recipe needs the texture of canned diced tomatoes, consider adding a tablespoon of tomato paste to concentrate the flavor and thicken the sauce.

If you’re cooking with fresh tomatoes straight from the garden, blanch and peel them first for the best texture. The skins can become tough and chewy in long-cooked dishes. A quick dip in boiling water makes peeling easy.

Weight and Volume for Common Tomato Products

While volume measurements work for most recipes, weight can be more precise — especially if you’re scaling or baking. Thespicetrain provides useful reference data for common tomato products. Per Thespicetrain’s drained weight per cup data, a cup of canned diced tomatoes weighs 8.5 ounces undrained and 7.5 ounces drained. That half-ounce difference accounts for the packing liquid you pour off.

Other tomato products have different densities depending on how they’re processed. Tomato paste is the heaviest at 10.5 ounces per cup because most of the water has been removed. Tomato sauce and crushed tomatoes both land around 8.5 ounces per cup. Whole tomatoes, packed in juice, also weigh about 8.5 ounces per cup undrained.

These weight differences matter when you’re trying to match a specific recipe closely. A cup of tomato paste adds significantly more tomato solids per unit of volume than a cup of diced tomatoes. Knowing the weight per cup helps you adjust when swapping one tomato product for another, especially in recipes where texture or concentration affects the final result.

Weight per Cup for Common Tomato Products

The Bottom Line

A standard 14.5-ounce can of diced tomatoes holds about 1.5 cups and equals roughly 5 to 6 fresh tomatoes. Larger cans scale proportionally. Knowing these conversions helps you substitute fresh for canned, scale recipes confidently, and reduce food waste. The cup yield is the most reliable measurement when precision matters.

Whether you’re stocking the pantry or shopping the farmers market, keep that 5-to-6 tomato count in mind — it makes fresh-to-canned swaps feel automatic rather than guesswork the next time you’re building a sauce or stew.