diff --git a/pcb_calculator/attenuators/bridget_tee_formula.h b/pcb_calculator/attenuators/bridget_tee_formula.h
index 94d6382d15..d8064681ab 100644
--- a/pcb_calculator/attenuators/bridget_tee_formula.h
+++ b/pcb_calculator/attenuators/bridget_tee_formula.h
@@ -5,7 +5,7 @@ _HKI( "### Bridged Tee Attenuator\n"
 "___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>\n"
 "___Z<sub>0</sub> = Z<sub>in</sub> = Z<sub>out</sub>___\n"
 "\n"
-"___L = 10<sup>a/20</up>___<br>\n"
+"___L = 10<sup>a/20</sup>___<br>\n"
 "___R1 = Z<sub>0</sub> &middot; (L&minus;1)___<br>\n"
 "___R2 = Z<sub>0</sub> / (L&minus;1)___\n"
 "" );
diff --git a/pcb_calculator/attenuators/bridget_tee_formula.md b/pcb_calculator/attenuators/bridget_tee_formula.md
index b747b2835b..ef17a4b93f 100644
--- a/pcb_calculator/attenuators/bridget_tee_formula.md
+++ b/pcb_calculator/attenuators/bridget_tee_formula.md
@@ -4,6 +4,6 @@ ___Z<sub>in</sub>___ is desired input impedance in &#x2126;<br>
 ___Z<sub>out</sub>___ is desired output impedance in &#x2126;<br>
 ___Z<sub>0</sub> = Z<sub>in</sub> = Z<sub>out</sub>___
 
-___L = 10<sup>a/20</up>___<br>
+___L = 10<sup>a/20</sup>___<br>
 ___R1 = Z<sub>0</sub> &middot; (L&minus;1)___<br>
 ___R2 = Z<sub>0</sub> / (L&minus;1)___