To convert tablespoons to cups (tbsp to cup), multiply by 0.0625. 1 tablespoon equals 0.0625 cup, about 3 times as much as a teaspoon.
| tablespoons | cups |
|---|---|
| 1 tablespoon | 0.0625 cup |
| 2 tablespoons | 0.125 cup |
| 5 tablespoons | 0.3125 cup |
| 10 tablespoons | 0.625 cup |
| 25 tablespoons | 1.5625 cup |
| 50 tablespoons | 3.125 cup |
| 100 tablespoons | 6.25 cup |
| 250 tablespoons | 15.625 cup |
| 500 tablespoons | 31.25 cup |
| 1000 tablespoons | 62.5 cup |
The factor is 0.0625000, which is derived rather than defined, so any decimal you see has been rounded somewhere.
No simple round multiplier is close enough to be useful, so this is one to look up rather than estimate. The exact factor is 0.0625000.
Going the other way, one cup is 16 tbsp, which is usually the easier direction to work in. Because the forward factor is small, watch the decimal place rather than the digits: a factor-of-ten slip is the common error, not a rounding one.
To anchor the scale: 20 tablespoons is about 1.25 cup.