A typical 1 tbsp serving of half and half contains 0.5 grams of protein (3.13 g per 100 g), which makes it only a minor source of protein. That covers roughly 1% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 10% of the calories in half and half come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
Among the 81 dairy foods in the database, half and half ranks 78th by protein per serving, and 774th out of all 796 foods on the site. Set against sweet whey powder, another dairy food entry in the database, a serving carries about 0.5 g less protein (sweet whey powder has 1 g per 1 tbsp).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving above is measured by volume at 15 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #171255 - "Cream, fluid, half and half" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Half and half protein FAQ
How much protein is in half and half per 100 g?
Half and half has 3.13 g of protein per 100 g. A typical 1 tbsp serving (15 g) provides 0.5 g.
Is half and half a complete protein?
Yes. Half and half is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
How much of the Daily Value does a serving of half and half cover?
A 1 tbsp serving of half and half contains 0.5 g of protein, about 1% of the 50 g reference Daily Value.
Is half and half a good source of protein?
Half and half is only a minor source of protein, and about 10% of its calories come from protein, which makes it more of an energy food than a protein food. Set against sweet whey powder, another dairy food entry in the database, a serving carries about 0.5 g less protein (sweet whey powder has 1 g per 1 tbsp).