Trying to do calculations for density

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%% Variables
% Input
%   P_t - Total pressure [atm]
%   P_s - Surface pressure [atm]
%   H - Height [ft]
   
% Output
%   rho - Density [kg/m^3]
% Other  
%   g - Gravity [m/s^2]
% Write your entire function code below here (Including header)
 
function [Rho] = RQ16_18(P_t,P_s,H) % The order of input variables should be Total Pressure, Surface Pressure, and Height
% Constants
P_t=4;
P_s=3;
H=25;
% Calculations
H = H/3.281; %Convert Ft to Meters
Tp = P_t * 101325; %Convert Atm to Pascals
Sp = P_s * 101325; %Convert Atm to Pascals
g = 9.8; %gravity 
Rho = (Tp - Sp)/(g*H); %Density
end

I am trying to get the density and its defined as Rho however when matlab grader grades it it says the value is wrong. Am I missing a conversion? or Caluclation?