
CSTL Valuation
Castle Biosciences Inc
- Overview
- Forecast
- Valuation
- Earnings
CSTL Relative Valuation
CSTL's fair value is calculated using relative valuation, based on historical P/E and P/S ranges and their premiums/discounts relative to a competitor average, adjusted by weights. If the market price exceeds this fair value range, CSTL is overvalued; if below, it's undervalued.
Historical Valuation
Castle Biosciences Inc (CSTL) is now in the Fair zone, suggesting that its current forward PS ratio of 1.99 is considered Fairly compared with the five-year average of -29.03. The fair price of Castle Biosciences Inc (CSTL) is between 8.97 to 113.57 according to relative valuation methord.
Relative Value
Fair Zone
8.97-113.57
Current Price:20.56
Fair
-8.97
PE
1Y
3Y
5Y
Trailing
Forward
-43.73
EV/EBITDA
Castle Biosciences Inc. (CSTL) has a current EV/EBITDA of -43.73. The 5-year average EV/EBITDA is -22.07. The thresholds are as follows: Strongly Undervalued below -86.26, Undervalued between -86.26 and -54.17, Fairly Valued between 10.02 and -54.17, Overvalued between 10.02 and 42.11, and Strongly Overvalued above 42.11. The current Forward EV/EBITDA of -43.73 falls within the Historic Trend Line -Fairly Valued range.
-4.41
EV/EBIT
Castle Biosciences Inc. (CSTL) has a current EV/EBIT of -4.41. The 5-year average EV/EBIT is -28.11. The thresholds are as follows: Strongly Undervalued below -162.26, Undervalued between -162.26 and -95.19, Fairly Valued between 38.96 and -95.19, Overvalued between 38.96 and 106.04, and Strongly Overvalued above 106.04. The current Forward EV/EBIT of -4.41 falls within the Historic Trend Line -Fairly Valued range.
1.99
PS
Castle Biosciences Inc. (CSTL) has a current PS of 1.99. The 5-year average PS is 6.92. The thresholds are as follows: Strongly Undervalued below -5.75, Undervalued between -5.75 and 0.58, Fairly Valued between 13.25 and 0.58, Overvalued between 13.25 and 19.59, and Strongly Overvalued above 19.59. The current Forward PS of 1.99 falls within the Historic Trend Line -Fairly Valued range.
28.43
P/OCF
Castle Biosciences Inc. (CSTL) has a current P/OCF of 28.43. The 5-year average P/OCF is -12.92. The thresholds are as follows: Strongly Undervalued below -104.49, Undervalued between -104.49 and -58.70, Fairly Valued between 32.86 and -58.70, Overvalued between 32.86 and 78.64, and Strongly Overvalued above 78.64. The current Forward P/OCF of 28.43 falls within the Historic Trend Line -Fairly Valued range.
353.20
P/FCF
Castle Biosciences Inc. (CSTL) has a current P/FCF of 353.20. The 5-year average P/FCF is -1.54. The thresholds are as follows: Strongly Undervalued below -180.69, Undervalued between -180.69 and -91.12, Fairly Valued between 88.04 and -91.12, Overvalued between 88.04 and 177.62, and Strongly Overvalued above 177.62. The current Forward P/FCF of 353.20 falls within the Strongly Overvalued range.
Castle Biosciences Inc (CSTL) has a current Price-to-Book (P/B) ratio of 1.28. Compared to its 3-year average P/B ratio of 1.49 , the current P/B ratio is approximately -14.11% higher. Relative to its 5-year average P/B ratio of 2.41, the current P/B ratio is about -46.84% higher. Castle Biosciences Inc (CSTL) has a Forward Free Cash Flow (FCF) yield of approximately 5.93%. Compared to its 3-year average FCF yield of -2.48%, the current FCF yield is approximately -338.96% lower. Relative to its 5-year average FCF yield of -2.12% , the current FCF yield is about -379.40% lower.
1.28
P/B
Median3y
1.49
Median5y
2.41
5.93
FCF Yield
Median3y
-2.48
Median5y
-2.12
Competitors Valuation Multiple
The average P/S ratio for CSTL's competitors is 1.76, providing a benchmark for relative valuation. Castle Biosciences Inc Corp (CSTL) exhibits a P/S ratio of 1.99, which is 13.50% above the industry average. Given its robust revenue growth of -0.94%, this premium appears unsustainable.
P/S
P/E
EV/EBITDA
EV/EBIT
P/S
Performance Decomposition
1Y
3Y
5Y
Market capitalization of CSTL decreased by 30.70% over the past 1 year. The primary factor behind the change was an decrease in P/E Change from -50.60 to -60.22.
The secondary factor is the Revenue Growth, contributed -0.94%to the performance.
Overall, the performance of CSTL in the past 1 year is driven by P/E Change. Which is more unsustainable.
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FAQ

Is Castle Biosciences Inc (CSTL) currently overvalued or undervalued?
Castle Biosciences Inc (CSTL) is now in the Fair zone, suggesting that its current forward PS ratio of 1.99 is considered Fairly compared with the five-year average of -29.03. The fair price of Castle Biosciences Inc (CSTL) is between 8.97 to 113.57 according to relative valuation methord.

What is Castle Biosciences Inc (CSTL) fair value?

How does CSTL's valuation metrics compare to the industry average?

What is the current P/B ratio for Castle Biosciences Inc (CSTL) as of Aug 19 2025?

What is the current FCF Yield for Castle Biosciences Inc (CSTL) as of Aug 19 2025?

What is the current Forward P/E ratio for Castle Biosciences Inc (CSTL) as of Aug 19 2025?
