How this converter decides what math to use
This tool covers two genuinely different kinds of conversion, and it's worth understanding which one applies to your situation. Converting between two volume units (cups, mL, tablespoons, teaspoons, fluid ounces) or between two weight units (grams, ounces) is pure, exact arithmetic — the ingredient never matters, since you're just re-expressing the same physical quantity in different units. But converting from a volume unit to a weight unit (or the reverse) requires knowing the ingredient's density, which is why the ingredient dropdown only appears when you're crossing between these two categories — it's genuinely irrelevant otherwise, and showing it all the time would be misleading about which conversions actually depend on it.
When to use this vs. a dedicated page
This all-in-one tool is convenient for one-off or unusual conversions (fluid ounces to grams of honey, say) — but if you're doing a specific common conversion repeatedly, our dedicated pages (cups to grams, tablespoons to teaspoons, ounces to grams) have more detailed ingredient lists and reference charts specific to that conversion.
FAQ
Why doesn't the ingredient dropdown show for tablespoons to teaspoons?Because that's a pure volume-to-volume conversion — the ratio (1 tbsp = 3 tsp) never changes regardless of what's being measured, so an ingredient selection wouldn't do anything.
Which cup size does this use? The US customary cup (236.588 mL) — see our milliliters-to-cups page for a note on metric cup differences if you're working from an Australian or UK recipe.