Sub-year CAGR calculator
Monthly CAGR Calculator
Annualize growth measured over a number of months, or start with a known annual CAGR and convert it to the equivalent monthly compound rate.
Monthly-period calculator
Calculate CAGR from a number of months
The annualized CAGR uses months ÷ 12 as the elapsed years. The equivalent monthly compound rate is shown separately.
Annualized CAGR
31.4534%
- Monthly compound rate
- 2.3052%
- Total growth
- 20%
- Elapsed years used for CAGR
- 0.666667
Annualized CAGR → Monthly compound rate
0.9489%
How monthly-period CAGR works
Convert the number of months to years by dividing by 12, then use the standard CAGR formula.
CAGR = (Ending ÷ Starting)^(12 ÷ Months) − 1
Convert annual CAGR to a monthly rate
If I already know the annual CAGR, I take the twelfth root of its annual growth factor. The result is the equivalent constant monthly compound rate.
Monthly Rate = (1 + Annual CAGR)^(1 ÷ 12) − 1
Last verified
2026-09-20
Calculation methodology
Calculation methodology