Saying 'Because': から and ので
To give a reason for something, Japanese has two main words: kara (から) and node (ので). They both mean 'because', but they are used in very different situations.
Subjective vs Objective Reasons
から (kara) is subjective. It emphasizes your personal reason, opinion, or decision. It is direct and can sometimes sound a bit strong or selfish if used as an excuse.
ので (node) is objective. It presents the reason as a natural, unavoidable fact. Because it sounds less personal, it is considered softer, more polite, and is preferred in business or when making excuses.
How to connect them
Comparing the Nuance
Teacher's Advice
If you are apologizing to your boss for being late, NEVER use 'kara'. 'Densha ga okureta kara...' sounds like 'The train was late, so it's not my fault!'. Instead, use 'node': 'Densha ga okureta node...' This sounds like 'Due to the objective fact of the train delay, I am unfortunately late.'
The single most common written error I correct: 好きだので / 雨だので. The だ must become な before ので (好きなので・雨なので), while before から it stays だ (好きだから・雨だから). If you remember only one thing from this page, remember: だから but なので.
JLPT Exam Patterns
- •Remembering the connection for nouns/na-adjectives: だから (da kara) vs なので (na node) (N5/N4)
- •Choosing 'node' over 'kara' in polite reading comprehension passages (N4)
- •Ordering sentences: Reason + kara/node + Result (N5)
- •ので + permission/request (〜ので、〜てもいいですか) as a set phrase in listening dialogues (N4)
- •Trap option だので: always wrong; the tested connection is なので (N5/N4)
A Quick Test: Which One Would a Native Choose?
If you're not sure which to use, try this: read the sentence and ask whether you're stating your own reasoning (から) or presenting a reason as simply-how-things-are (ので). 疲れたから、休みます (I'm tired, so I'm resting) sounds like a personal decision. 疲れたので、休みます (Since I'm tired, I'll rest) sounds like you're reporting a fact that happens to justify the action, softer and more suited to an email to your boss.
This is also why apologies and excuses lean heavily on ので: 電車が遅れたので、遅刻しました (My train was delayed, so I was late) distances you slightly from the excuse, which reads as more sincere than 電車が遅れたから, which can sound like you're arguing your case.
Frequently Asked Questions
What is the difference between から and ので?
Both mean "because," but から states the reason subjectively and directly, while ので presents it as an objective, softer explanation. ので sounds more polite and is preferred when making requests or excuses (遅れたので、すみません). から is fine in casual speech and for personal opinions.
Should I use から or ので in polite conversation?
Prefer ので when asking for permission, making requests, or explaining yourself to someone of higher status. It sounds less assertive. Saying 用事があるので、お先に失礼します is noticeably softer than 用事があるから. から can sound like you are insisting on your reason.
How do から and ので connect to nouns and な-adjectives?
から follows the plain form directly, including だ: 学生だから. ので requires な after nouns and な-adjectives: 学生なので, 静かなので. Forgetting the な before ので is one of the most common JLPT N4 mistakes.
Related Grammar
Master Reasons
Practice the difference between da kara and na node with our interactive quizzes.