1 US tablespoons to US cups
0.063 cup
1 tbsp = 0.063 cup.
US cups
0.063cup
1 tbsp = 0.063 cup
In short
How many US cups is 1 US tablespoons?
1 tbsp = 0.063 cup. 1 US tablespoon = 0.062500 US cups, so the working is 1 × 0.062500 = 0.063.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 US tablespoon = 0.062500 US cups 1 × 0.062500 = 0.063
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (cup) | Off by |
|---|---|---|
| Whole number | 0 | −0.06250 |
| 1 decimal | 0.1 | +0.03750 |
| 2 decimals | 0.06 | −0.00250 |
Round trip: take 0.063 cup back the other way and you land on 1.0080 tbsp — a drift of 0.0080 tbsp. That gap is the rounding, not the conversion.
What 1 tbsp looks like
1 tbsp
A US tablespoon is 14.79 mL, though 21 CFR 101.9 rounds it to 15 mL for nutrition labels.
Frequently asked questions
What is 1 US tablespoons in US cups?
1 US tablespoons is 0.063 US cups. 1 US tablespoon = 0.062500 US cups, so the working is 1 × 0.062500 = 0.063.
How accurate is 0.063 cup?
Rounding to 0.063 cup and converting straight back gives 1.0080 tbsp, a drift of 0.0080 tbsp from the 1 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
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