A cup is a volume, a gram is a weight, and panko is the reason the two cannot be swapped casually. One cup of panko holds 236.6 ml — that part never changes. But it weighs about 50 g, and that weight depends on the ingredient, the way it was measured, and even the day it was packed. This guide gives you the full picture: the millilitre figure, the gram figure from King Arthur Baking, a table covering every amount from a quarter cup to four cups, worked examples you can copy into your own cooking, and the measuring technique that makes the numbers reliable. If you only remember one thing from this page, make it this: the millilitres are exact, the grams are approximate, and a kitchen scale settles the argument.
How much is 1 cup of panko in millilitres?
1 cup of panko is 236.6 ml and weighs about 50 g. The millilitre figure is exact, because a US cup is defined as 236.6 ml: fill any cup measure to the brim with any ingredient and you have 236.6 ml of it. The gram figure is approximate, because it depends on the density of panko and on how the cup was filled. The value we use, 50 g, comes from King Arthur Baking, measured spooned and levelled, and we use it with high confidence. If you are baking, scaling a recipe, or cooking for someone with a dietary restriction, weigh the panko on a kitchen scale and use the gram figure — it is the only measurement that does not depend on how fluffy, damp or tightly packed the ingredient happens to be today.
That distinction between exact volume and approximate weight is the single most useful thing to understand about cup conversions. Recipes written in cups assume a standard cup and a standard technique, and when either of those assumptions breaks, the recipe breaks with it. A cup of panko scooped straight from the bag can weigh noticeably more than a cup spooned in gently, and the difference is invisible until the finished dish tells you about it. The table below gives you both figures for every amount you are likely to need, so you can convert in either direction without doing the arithmetic yourself.
Cups to millilitres table for panko
| Cups | Millilitres | Grams (approx.) |
|---|---|---|
| ¼ cup | 59.2 ml | 13 g |
| ⅓ cup | 78.9 ml | 17 g |
| ½ cup | 118.3 ml | 25 g |
| ⅔ cup | 157.7 ml | 33 g |
| ¾ cup | 177.5 ml | 38 g |
| 1 cup | 236.6 ml | 50 g |
| 2 cups | 473.2 ml | 100 g |
| 3 cups | 709.8 ml | 150 g |
| 4 cups | 946.4 ml | 200 g |
Every row in this table follows the same two rules. The millilitre column is the cup fraction multiplied by 236.6 ml, so a quarter cup is 59.2 ml, a third of a cup is 78.9 ml, half a cup is 118.3 ml, two-thirds is 157.7 ml, and three-quarters is 177.5 ml. Those numbers are exact to one decimal place and they are the same for every ingredient on this site. The gram column is the same fraction multiplied by 50 g, the weight of a full cup of panko, and those numbers are approximate: a quarter cup is about 13 g, half a cup about 25 g, and four cups about 200 g. Use the millilitres when you are measuring volume, and the grams when you are measuring weight — and remember that only the grams need a scale to check.
There is one more conversion worth knowing. One US cup is 8 US fluid ounces, so 1 cup of panko is also 8 fl oz by volume — but fluid ounces are a volume measure, not a weight measure, and panko does not weigh 8 ounces. Do not confuse the two: 8 fl oz of panko is a volume of 236.6 ml, while the weight is about 50 g. If a recipe gives ounces and you are not sure which kind it means, check whether it is talking about a measuring jug (fluid ounces, volume) or a scale (ounces, weight). When a recipe is ambiguous, the gram figure on this page is the safer one to follow.
Worked examples
Doubling a batch of granola
A granola recipe that uses 2 cups of panko needs 473.2 ml, about 100 g. When you double it to 4 cups, that is 946.4 ml and about 200 g. Weigh the doubled amount rather than measuring four separate cups — every cup you scoop adds its own small error, and weighing once removes all four at once.
A family dinner that needs three cups
A rice or grain dish that calls for 3 cups of panko needs 709.8 ml, about 150 g. Weigh the dry grain before rinsing — wet grain weighs more, and a cup of wet grain is not a cup of dry grain. Rinse, drain well, and cook with the liquid the recipe specifies, measured in millilitres for accuracy.
A single serving of porridge
A single bowl of porridge that uses ½ cup of panko needs 118.3 ml, about 25 g. That is the easiest place to start weighing: put the bowl on the scale, tare it, and pour the dry grain straight in. It is faster than finding the measuring cup, and the portion is identical every morning.
How to measure 1 cup of panko
Panko is a dry staple, and dry staples are where cup measurements are at their most unreliable. A cup of panko poured straight from the bag weighs more than a cup spooned in gently, because pouring lets the grains settle and pack. The figure on this page, 50 g per cup, is for panko measured spooned and levelled, which is the gentlest, most repeatable method — and it is the method you should copy at home. If you scoop, you will almost always overshoot, and with grains that overshoot adds up: an extra 10 g per cup across four cups of rice or oats is a real difference in the finished dish. Weighing is the fix, and it is also faster once you are used to it: put the bowl on the scale, tare it, and pour until the display reads the grams you need.
The method behind our figure is spooned and levelled, and the source is King Arthur Baking. In practice that means: take a dry measuring cup, spoon the panko in until it heaps above the rim, then sweep a straight edge — the back of a knife is ideal — across the top to level it. Do not scoop the cup through the ingredient, do not tap the cup on the bench to settle the contents, and do not press the ingredient down. Each of those shortcuts packs more into the cup and makes the weight higher than the 50 g in the table, sometimes by a surprising amount. For a liquid or a pourable ingredient the method is simpler: pour into a liquid measuring jug, set it on a flat surface, and read the level at eye height.
If you do not have a scale, the spooned-and-levelled cup is the best you can do, and for most everyday cooking it is good enough. But if the recipe is a bake, a preserve, or anything where the ratio of ingredients does the structural work, borrow or buy a scale: even a basic digital scale is more accurate than the best cup technique, and it is faster once you are used to it. Put the bowl on the scale, press tare, and add panko until the display reads the grams you need. That is the whole technique, and it removes the single biggest source of variation in cup-based recipes.
Cooking with panko by weight, not by cup
Panko is used for crispy coatings for fried and baked foods. Light, airy Japanese breadcrumbs; very low density per cup.
Rinse, drain and weigh dry
Airtight container, cool and dry, up to 6 months. Most grains benefit from a rinse before cooking, but rinse after you have weighed the dry grain, not before — wet grain weighs more, and a cup of wet grain is not a cup of dry grain. Weigh the dry amount the recipe calls for, rinse it, drain it well, and cook it. That way the conversion table stays accurate and the recipe stays repeatable.
The cup is a starting point, not a law
Different brands and different harvests of panko vary slightly in size and density, so the 50 g figure is approximate. For everyday cooking that does not matter; for a recipe where the grain-to-liquid ratio is critical, such as a risotto or a pilaf, weigh the grain and measure the liquid in millilitres, and you will get the same result every time.
Common mistakes with cups and millilitres
The most common mistake is treating the millilitre figure and the gram figure as interchangeable. They are not: 236.6 ml is a volume and 50 g is a weight, and the only ingredient for which they are equal is water, where 1 ml weighs 1 g. For panko, 236.6 ml weighs about 50 g, and if you weigh out 236.6 g of panko instead of measuring 236.6 ml, you will have the wrong amount — too much if 50 is greater than 236.6, too little if it is less. Always check whether the recipe wants a volume or a weight, and use the matching column of the table.
The second most common mistake is using the wrong cup. A US cup is 236.6 ml, a metric cup is 250 ml, and a UK cup in older recipes can mean something else again. If your measuring cup came with a set that does not say which standard it follows, check it against a measuring jug: fill the cup with water and pour it into the jug. If it reads 236.6 ml, it is a US cup; if it reads 250 ml, it is a metric cup. Once you know, write it on the cup with a permanent marker so you never have to guess again.
The third mistake is measuring over the mixing bowl. It feels efficient, but a spill goes straight into the batter and cannot be taken back, and a cup read from above always looks fuller than it is. Measure over the sink or a plate, level the cup, and then tip it into the bowl. It takes five seconds longer and it prevents the kind of error that ruins a bake.
Frequently asked questions
How many millilitres is 1 cup of panko?
1 cup of panko is 236.6 ml. That figure is fixed: a US cup is defined as 236.6 ml, so it is the same for every ingredient. What changes from one ingredient to another is the weight, and 1 cup of panko weighs about 50 g. The volume never changes; the weight always depends on the ingredient.
How many grams is 1 cup of panko?
1 cup of panko weighs about 50 g, measured spooned and levelled according to King Arthur Baking. The word "about" matters: the exact weight of a cup depends on how the ingredient is handled, how finely it is ground or cut, and how much moisture it holds. For baking and for any recipe where the amount is critical, weigh the ingredient on a kitchen scale rather than trusting the cup.
Is 1 cup of panko the same as 250 ml?
No. A US cup is 236.6 ml, while a metric cup — used in Australia and in many metric recipes — is 250 ml. The difference is 13.4 ml per cup, which is about 5.7%. If your recipe was written with metric cups and you measure with a US cup, you will be short on every cup; if it was written with US cups and you use a metric cup, you will be over. Check which cup your recipe means, and when in doubt use the gram figure, 50 g, which does not depend on the cup at all.
How many tablespoons of panko are in a cup?
There are 16 tablespoons in 1 cup, so 1 cup of panko is 16 tablespoons, weighing about 50 g in total. One tablespoon is about 3.1 g and one teaspoon is about 1.0 g. These spoon figures are worked back from the cup weight, so they carry the same approximation — they are useful for small amounts, but for a full cup the scale is still the more accurate tool.
Should I weigh panko before or after cooking?
Always before cooking, in its dry state. The 50 g per cup figure is for dry panko, and cooking adds water, which changes the weight completely. Weigh the dry grain, then cook it with the liquid the recipe specifies. Weighing cooked grain against a dry figure is one of the most common measuring mistakes in the kitchen.
Can I use a kitchen scale instead of a cup for panko?
Yes, and for most recipes you should. Put your bowl on the scale, press tare to zero it, and add panko until the display reads the grams you need — 50 g for a full cup, 25 g for half a cup, 13 g for a quarter cup. A scale removes every variable that makes cup measuring unreliable: how firmly the ingredient was packed, how it was scooped, and how humid the day is.