An ergonomic device is for a writing instrument. The ergonomic device includes a body having a first curved side, and a second curved side opposite to the first curved side and to be adjacent to the writing instrument. The ergonomic device also includes a first arm between the first curved side and the second curved side and extending outwardly from the body. The first arm defines a first opening to receive an index finger and a middle finger of a user. The ergonomic device includes a second arm between the first curved side and the second curved side and opposite to the first arm. The second arm extends outwardly from the body and defines a second opening to receive a thumb of the user.