21 US tablespoons to US cups
1.313 cup
21 tbsp = 1.313 cup.
US cups
1.313cup
21 tbsp = 1.313 cup
In short
How many US cups is 21 US tablespoons?
21 tbsp = 1.313 cup. 1 US tablespoon = 0.062500 US cups, so the working is 21 × 0.062500 = 1.313.
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 21 × 0.062500 = 1.313
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 | 1 | −0.31250 |
| 1 decimal | 1.3 | −0.01250 |
| 2 decimals | 1.31 | −0.00250 |
Round trip: take 1.313 cup back the other way and you land on 21.0080 tbsp — a drift of 0.0080 tbsp. That gap is the rounding, not the conversion.
Frequently asked questions
What is 21 US tablespoons in US cups?
21 US tablespoons is 1.313 US cups. 1 US tablespoon = 0.062500 US cups, so the working is 21 × 0.062500 = 1.313.
How accurate is 1.313 cup?
Rounding to 1.313 cup and converting straight back gives 21.0080 tbsp, a drift of 0.0080 tbsp from the 21 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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