What it means
かな is placed at the end of a plain-form statement to show that the speaker is wondering or thinking aloud. It expresses uncertainty about a possibility and often does not require an answer. The polite equivalent is usually でしょうか, which presents the same uncertainty more respectfully.
Usage note
かな is mainly familiar and can sound casual in formal situations. Do not confuse it with ですか, which directly asks another person a question.
How to use it
田中さんは学生でしょうか。
I wonder whether Tanaka is a student.
この部屋は安全でしょうか。
I wonder whether this room is safe.
この道は長いでしょうか。
I wonder whether this road is long.
明日、雨が降るでしょうか。
I wonder whether it will rain tomorrow.
田中さんは学生かな。
I wonder whether Tanaka is a student.
この部屋は安全かな。
I wonder whether this room is safe.
この道は長いかな。
I wonder whether this road is long.
明日、雨が降るかな。
I wonder whether it will rain tomorrow.
Example sentences
明日は図書館が開いているかな。
I wonder if the library will be open tomorrow.
この薬を飲んだら、頭痛は治るかな。
I wonder if my headache will go away if I take this medicine.
来週の発表に間に合うかな。
I wonder if I will make it in time for next week's presentation.
この古い写真は