A tablespoon of maple syrup is a standard serving size that measures 1 tbsp (14.8 mL). You can visualize this amount as being about the size of a grape.

In kitchen measures
3 teaspoons
3 tsp · 1 tbsp · 0.063 cups
about the size of a grape
Maple syrup typically ranges 1.3–1.4 g/mL depending on how it's packed. A firmly packed scoop weighs more.