FA-96930 / Recipe scaling and nutrition / Member archive

Volume-to-mass ingredient converter: millilitres per cup · case 05

250 ml of water converts to 236 g instead of 249 g.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Convert amount (fraction string) of cup/tbsp/tsp/ml to grams. 1 cup = 16 tbsp = 48 tsp = 236.5 ml. Grams per cup: flour 120, sugar 200, brown sugar 145 (213 when prefixed "packed "), butter 227, honey 340, water 236. Names are trimmed and case-insensitive; a ", sifted" suffix multiplies density by 9/10. Results below 10 g print one decimal ("%.1f g"), otherwise whole grams, both half-up. Unknown ingredient or unit returns an error string.

Why this case matters

Recipe apps convert American volume measures to weights for scaling and nutrition lookup.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
metric cup of water	`"236 g"`	`"249 g"`	Failed

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