Volume converter
Converting fluid ounces (us) to cups (us) is a small, specific task, but getting it wrong by even a rounding error can throw off a recipe, a shipping quote, a construction cut list, or a homework answer. This page runs a live Fluid Ounces (US) to Cups (US) converter — type a number in fl oz and get the exact cup equivalent instantly, calculated with the standard conversion factor rather than an approximation. One fl oz equals 0.125 cup, and the calculator below scales that ratio to any amount you enter.
To convert a value from fluid ounces (us) to cups (us), multiply the number of fl oz by 0.125. That figure comes from expressing both units against the same reference — in this case, volume are compared through a common volume base unit — so the ratio holds no matter how large or small the input is.
Common fl oz amounts and their cup equivalents, rounded to six decimal places for accuracy:
Volume conversions come up constantly outside of a classroom. Recipes written for a US audience use cups and tablespoons while international ones use metric measurements; travel and navigation mix miles, kilometers, and nautical units depending on the country and mode of transport; and technical fields like engineering, medicine, and manufacturing often require converting between systems to match a spec sheet, a prescription, or a purchase order.
Manual conversion is where mistakes creep in — misplacing a decimal, using an outdated or rounded factor, or mixing up which unit is larger. Because this converter applies the exact multiplier every time, the result for fluid ounces (us) to cups (us) is consistent whether you're converting a single small number or a large batch of values one at a time.
1 fl oz equals 0.125 cup. Multiply any fl oz value by this factor to get cup.
It uses the standard defined conversion factor for fluid ounces (us) and cups (us), so results are precise to the rounding shown, not a rough estimate.
Yes — use the swap control in the calculator to reverse the direction and convert cups (us) into fluid ounces (us) instead.
No. The calculation runs locally in your browser using JavaScript, so nothing you type is sent anywhere.
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| Fluid Ounces (US) | Cups (US) |
|---|---|
| 1 fl oz | 0.125 cup |
| 5 fl oz | 0.625 cup |
| 10 fl oz | 1.25 cup |
| 25 fl oz | 3.125 cup |
| 50 fl oz | 6.25 cup |
| 100 fl oz | 12.5 cup |
| 500 fl oz | 62.5 cup |
| 1000 fl oz | 125 cup |