A recipe called for 200 grams of flour. I did not own a kitchen scale. I searched "200 grams flour in cups" and found answers ranging from 1.25 cups to 1.75 cups, depending on the source. That is a 40% variance. In baking, where ratios determine whether you get bread or a brick, a 40% difference is the gap between success and failure.
The problem is fundamental: cooking measurements mix volume and weight, and the conversion between them depends on the density of the ingredient. One cup of flour does not weigh the same as one cup of sugar, and one cup of loosely scooped flour does not weigh the same as one cup of packed flour.
Why volume measurements are imprecise
A "cup" is a volume measurement: 236.6 milliliters (US customary) or 250 milliliters (metric/Australian). It tells you how much space the ingredient occupies, not how much mass it has.
The problem is that most solid ingredients pack differently depending on how they are handled:
All-purpose flour:
Sifted: 120 grams per cup
Spooned: 125 grams per cup
Scooped: 140 grams per cup
Packed: 160 grams per cup
That is a 33% range for the same ingredient measured with the same cup. If a recipe says "1 cup of flour" without specifying the method, you are guessing.
Liquids do not have this problem. One cup of water is 236.6 grams (at room temperature) regardless of how you pour it. One cup of olive oil is consistently about 216 grams. This is why volume measurements work fine for liquids but are unreliable for solids.
The conversion tables you actually need
Here are the approximate weights for common ingredients at the "spooned and leveled" standard (the most common method in US recipes):
Ingredient 1 cup (grams) 1 tablespoon (grams)
All-purpose flour 125 8
Bread flour 130 8
Cake flour 115 7
Granulated sugar 200 12.5
Brown sugar (packed) 220 14
Powdered sugar 120 7.5
Butter 227 (2 sticks) 14
Honey 340 21
Milk 245 15
Heavy cream 240 15
Cocoa powder 85 5
Rolled oats 90 5.5
Rice (uncooked) 185 12
Salt (table) 288 18
Salt (kosher, Morton) 240 15
Salt (kosher, Diamond) 144 9
That last line is the most treacherous one. Morton kosher salt and Diamond Crystal kosher salt have different crystal sizes, which means the same volume contains dramatically different amounts of actual salt. A tablespoon of Morton is about twice as salty as a tablespoon of Diamond Crystal. Recipes written by professional chefs in the US almost always assume Diamond Crystal. If you use Morton, halve the volume. This single conversion error has ruined more dishes than any other.
The metric system eliminates most of these problems
Professional kitchens worldwide use weight measurements (grams and kilograms) for almost everything. A recipe that says "200g flour, 150g sugar, 100g butter" is unambiguous. It does not matter how you scoop, pack, or sift. 200 grams is 200 grams.
The US is the primary holdout on volume-based cooking measurements, and even many US-based professional bakers have switched to weight. If you are serious about cooking consistency, buy a kitchen scale. A $15 digital scale will improve your baking more than a $300 stand mixer.
Temperature conversions
Recipes also cross between Fahrenheit and Celsius. The conversion formula is:
Celsius = (Fahrenheit - 32) * 5/9
Fahrenheit = Celsius * 9/5 + 32
Common baking temperatures:
300F = 149C (low/slow baking: meringues, dehydrating)
325F = 163C (cheesecake, delicate cakes)
350F = 177C (the default: cookies, cakes, quick breads)
375F = 191C (slightly hotter: some cookies, pies)
400F = 204C (bread, roasting vegetables)
425F = 218C (pizza, high-heat roasting)
450F = 232C (bread crusts, broiling)
500F = 260C (pizza steel, extreme high heat)
Gas mark is another system, primarily used in British recipes:
Gas Mark 1 = 275F = 135C
Gas Mark 3 = 325F = 163C
Gas Mark 4 = 350F = 177C
Gas Mark 5 = 375F = 191C
Gas Mark 6 = 400F = 204C
Gas Mark 7 = 425F = 218C
Scaling recipes
Scaling a recipe by a factor is not always straightforward multiplication. Some quantities scale linearly, and some do not.
Ingredients scale linearly. If a recipe for 12 cookies uses 200g flour, a recipe for 24 cookies uses 400g flour. This is reliably true for all ingredients.
Baking time does not scale linearly. Doubling a cake recipe and baking it in a pan twice the size does not require double the baking time. Baking time depends on the thickness of the batter and the oven temperature, not the total volume. A thicker cake needs more time, but not proportionally more. A good starting point is to increase time by 25-50% when doubling, and check for doneness early.
Seasoning scales sub-linearly. Doubling the salt when you double a recipe often produces food that tastes too salty. This is partly because salt distributes throughout the food and partly because our taste perception is not linear. When scaling up, start with 1.5x the seasoning for a 2x batch and adjust to taste.
Leavening requires care. Doubling baking powder or baking soda in a doubled recipe usually works, but tripling or quadrupling can produce a metallic taste or cause the batter to rise too fast and collapse. For large-scale baking, increase leavening by 75% for a doubled recipe and test from there.
Common mistakes
Confusing fluid ounces and weight ounces. A fluid ounce is a volume measurement (29.6 ml). A weight ounce is 28.35 grams. One fluid ounce of water weighs approximately one weight ounce, but one fluid ounce of honey weighs about 1.5 weight ounces. When a recipe says "8 ounces of chocolate," it means weight. When it says "8 ounces of milk," it could mean either (and they happen to be nearly equal for milk).
Using the wrong cup standard. A US cup is 236.6 ml. An Australian/metric cup is 250 ml. A Japanese cup is 200 ml. A UK cup (though rarely used -- the UK typically uses milliliters) is 284 ml. If you are following a recipe from a different country, check which cup they mean.
Not taring the scale. When weighing ingredients into a bowl, always zero (tare) the scale after placing the bowl and after each ingredient. Forgetting to tare means your second ingredient includes the weight of the first.
Converting tablespoons to cups incorrectly. There are 16 tablespoons in a US cup, 3 teaspoons in a tablespoon. So 1/4 cup = 4 tablespoons, and 1 tablespoon = 3 teaspoons. These are exact conversions with no density ambiguity because they are all volume-to-volume.
For quick conversions between grams, cups, tablespoons, and teaspoons -- especially for specific ingredients where density matters -- I use the cooking converter at zovo.one/free-tools/cooking-converter to get ingredient-specific results rather than generic volume conversions.
Buy a scale. Use grams. But when a family recipe says "a heaping cup of flour," at least know what that approximately translates to.
I'm Michael Lip. I build free developer tools at zovo.one. 350+ tools, all private, all free.
Top comments (0)