Understand the choice
Convert bag sizes to a common unit price, then multiply by the actual dose. Add filters, milk and other consumables if they matter to your comparison. Keep currency and delivery costs consistent.
Put it into practice
Home and café prices include different services and expenses. The tools show your assumptions openly so you can make a useful personal budget without pretending that the two experiences are identical.
Keep the conversation useful
Share your actual recipe or experience, identify the coffee or equipment and explain what changed. A clear question with measurements makes the discussion easier for others to answer.