diff --git a/EPW/src/a2f.f90 b/EPW/src/a2f.f90
index a12600198..d986e4e7b 100644
--- a/EPW/src/a2f.f90
+++ b/EPW/src/a2f.f90
@@ -29,7 +29,7 @@
   USE phcom,     ONLY : nmodes
   USE cell_base, ONLY : omega
   USE epwcom,    ONLY : degaussq, delta_qsmear, nqsmear, nqstep, nsmear, eps_acustic, & 
-                        delta_smear, degaussw, fsthick
+                        delta_smear, degaussw, fsthick, nc
   USE elph2,     ONLY : nqtotf, wf, wqf, lambda_all, lambda_v_all
   USE constants_epw, ONLY : ryd2mev, ryd2ev, kelvin2eV, two, zero, kelvin2Ry, pi
   USE mp,        ONLY : mp_barrier, mp_sum
@@ -214,7 +214,7 @@
     ! Usually this means "the number of electrons that contribute to the mobility" and so it is typically 8 (full shell)
     ! but not always. You might want to check this. 
     ! 
-    n = 8.0 / omega
+    n = nc / omega
     !print*,'omega ',omega
     WRITE (iures, '(a)') '# Temperature [K]                Resistivity [micro Ohm cm] for different Phonon smearing (meV)        '  
     WRITE (iures, '("#     ", 15f12.7)') ( (degaussq+(ismear-1)*delta_qsmear)*ryd2mev,ismear=1,nqsmear )
diff --git a/EPW/src/epw_readin.f90 b/EPW/src/epw_readin.f90
index 40c360c71..f38a1f69b 100644
--- a/EPW/src/epw_readin.f90
+++ b/EPW/src/epw_readin.f90
@@ -51,7 +51,7 @@
                             cumulant, bnd_cum, proj, write_wfn, iswitch, ntempxx, &
                             liso, lacon, lpade, etf_mem, epbwrite, &
                             nsiter, conv_thr_racon, specfun_el, specfun_ph, &
-                            pwc, nswc, nswfc, nswi, &
+                            pwc, nswc, nswfc, nswi, nc, &
                             nbndsub, nbndskip, system_2d, delta_approx, &
                             title, int_mob, scissor, iterative_bte, scattering, &
                             ncarrier, carrier, scattering_serta, restart, restart_freq, &
@@ -113,7 +113,7 @@
        wannierize, dis_win_max, dis_win_min, dis_froz_min, dis_froz_max,       &
        num_iter, proj, bands_skipped, wdata, iprint, write_wfn,                &
        wmin, wmax, nw, eps_acustic, a2f, nest_fn, plselfen,                    & 
-       elecselfen, phonselfen, use_ws,                                         &
+       elecselfen, phonselfen, use_ws, nc,                                     &
        rand_q, rand_nq, rand_k, rand_nk, specfun_pl,                           &
        nqf1, nqf2, nqf3, nkf1, nkf2, nkf3,                                     &
        mp_mesh_k, mp_mesh_q, filqf, filkf, ephwrite,                           & 
@@ -290,6 +290,7 @@
   ! use_ws          : If .true., use the Wannier-center to create the Wigner-Seitz cell. 
   ! epmatkqread     : If .true., restart an IBTE calculation from scattering written to files. 
   ! selecqread      : If .true., restart from the selecq.fmt file
+  ! nc              : Number of carrier for the Ziman resistivity formula (can be fractional)
   !  
   ! Added by Manos Kioupakis
   ! omegamin  : Photon energy minimum
@@ -488,6 +489,7 @@
   use_ws     = .false.
   epmatkqread = .false.
   selecqread = .false.
+  nc         = 4.0d0
   !
   !     reading the namelist inputepw
   !
diff --git a/EPW/src/epwcom.f90 b/EPW/src/epwcom.f90
index 45afac876..82e78e9db 100644
--- a/EPW/src/epwcom.f90
+++ b/EPW/src/epwcom.f90
@@ -148,6 +148,8 @@
   !! Value of the scissor shift in eV.
   REAL (KIND=DP) :: ncarrier
   !! Amount of carrier concentration in cm^-3 when doping a semiconductors
+  REAL (KIND=DP) :: nc
+  !! Number of carrier per unit cell that participate to the conduction in the Ziman resistivity formula 
   ! 
   ! Plasmon
   REAL (KIND=DP) :: nel