以下详细说明暂以英文提供。
What CAGR tells you
The compound annual growth rate condenses a multi-year result into the steady yearly rate that would have taken you from the starting value to the ending value. Because it compounds, CAGR is the fair way to compare investments held over different periods: a portfolio that doubled in five years grew at about 14.9% a year, not 20%.
Where CAGR falls short
CAGR only looks at the two endpoints. If you added money midway, the true return on your activity differs from the CAGR, and a fund that swung wildly before landing on the same endpoint shows the same smooth rate as one that drifted gently. Pair CAGR with the IRR for cash-flow-heavy situations, and remember past growth never guarantees the next year.
中国本地参考
在中国大陆做财务换算时，以下框架值与美国默认值差异很大：
- 个人所得税: 工资薪金基本减除费用为 5,000 元/月（60,000 元/年），综合所得适用 3%–45% 七级超额累进税率（自 2019 年起施行）。
- 社保与公积金: 养老保险单位缴费 16%、个人 8%；住房公积金常见缴存比例为 5%–12%，由各城市确定上下限。
- 价签与增值税: 标价为含税价（一般纳税人增值税率 13%/9%/6%），结账时不额外加税，与美国小票加税习惯不同。
- 数字与单位: 使用公制单位（厘米、米、千克、升），温度为摄氏度；人民币符号 ¥，千分位用逗号、小数用点：12,345.67 元。
- 小费文化: 餐厅不付小费，部分场所收取服务费并已在账单中标明；无需按美式 15%–20% 计算。
数据核对：2026 年 10 月
常见问题
What is a good CAGR?
It depends on the asset and the era. Broad US stock indexes have compounded near 10% a year over long stretches, so a double-digit CAGR is strong for a diversified portfolio; a new venture may target far more to justify the risk.
How is CAGR different from a simple average return?
A simple average adds yearly returns and divides, which overstates results when returns swing. CAGR uses only the start and end values, so it reflects what actually happened to your money, including the drag of down years.
Can CAGR be negative?
Yes. If the ending value is below the starting value, CAGR comes out negative and represents the steady annual decline between the two points.