A practical look at how measuring actually works in the kitchen — the concepts behind every conversion on this site, in one place.
This is the single distinction that explains almost every question about kitchen measurement. Weight (grams, ounces, pounds) tells you how heavy something is; it doesn't change based on how the ingredient is arranged. Volume (cups, tablespoons, teaspoons) tells you how much space it takes up, which changes based on how loose or packed it is. Converting between the two requires knowing that ingredient's density — see how that calculation works on the homepage.
A gram is small — a US teaspoon of salt is a few grams. A kilogram is 1,000 grams, closer to the scale of a bag of flour. Most home recipes and kitchen scales work in grams for this reason; the GramToCup calculator and every ingredient page use the gram as the base weight unit.
These are all volume units, and their relationship to each other is fixed regardless of the ingredient: 1 US cup equals 16 tablespoons, and 1 tablespoon equals 3 teaspoons. What isn't fixed is how much each one weighs — that depends entirely on the ingredient's density. See the Grams to Tablespoons guide for how that trips people up.
A scale measures weight directly and is unaffected by how an ingredient settles or packs — it's the most accurate tool whenever a recipe specifies weight. Measuring cups and spoons are faster for volume-based recipes, small quantities, or when no scale is available. Neither tool is "wrong"; each fits different situations.
Dry measuring cups are filled to the brim and leveled flat with a straight edge. Liquid measuring cups have a spout and extra headspace above the fill line, and are read at eye level. Both hold the same volume at their marked line, but using the wrong type makes leveling dry goods difficult and makes liquids easy to spill.
How firmly an ingredient is pressed into the cup changes its weight without changing the volume reading. Most dry ingredients should be spooned and leveled; brown sugar is the familiar exception, meant to be packed firmly. Reversing these is one of the most common sources of measurement error — see Baking Accuracy Tips and Why Different Sites Show Different Values on the homepage.
Density is why a cup of flour and a cup of honey don't weigh the same, and it's the figure behind every conversion on this site. The Grams to Cups Chart and Cups to Grams Chart show it applied across every ingredient GramToCup tracks.
A US cup and a metric cup aren't the same size — a difference of about 5.7%. It rarely matters for a single tablespoon, but it compounds across a full recipe. See the US vs Metric Cups guide for the exact numbers and when it's worth caring about.
Use the calculator for any ingredient, or check a full reference chart directly.
Use the Gram to Cup Calculator →They serve different purposes. A scale is more accurate and is the best tool whenever a recipe specifies weight; measuring cups and spoons are faster for volume-based recipes or small quantities where scale precision matters less.
The most common reasons are cup standard (US vs metric), measuring technique (scooped vs spooned), and differences in assumed ingredient density. See the US vs Metric Cups guide and the Why Values Differ section on the homepage for the full breakdown.