Metriova提供金融、商业、健康和建筑的免费在线计算器。计算贷款、投资、健康指标和工程材料用量。
ROI measures gain relative to cost: ROI = (Gain - Cost) / Cost × 100. Average annual returns vary widely by asset class. Stocks average ~10% historically, while high-yield savings accounts return ~2%. Higher returns generally come with higher volatility and risk.