diff --git a/source/core/gamecontrol.cpp b/source/core/gamecontrol.cpp
index 1cf9e5bdb..780f2721c 100644
--- a/source/core/gamecontrol.cpp
+++ b/source/core/gamecontrol.cpp
@@ -1040,6 +1040,7 @@ void S_SetSoundPaused(int state)
 
 int CalcSmoothRatio(const ClockTicks &totalclk, const ClockTicks &ototalclk, int realgameticspersec)
 {
+	double const gametics = 1'000'000'000. / realgameticspersec;
 	uint64_t currentTime = I_nsTime();
 
 	if ((lastototalclk == ototalclk) && (lastTime != 0))
@@ -1053,7 +1054,16 @@ int CalcSmoothRatio(const ClockTicks &totalclk, const ClockTicks &ototalclk, int
 	}
 	lastTime = currentTime;
 
-	return clamp(MaxSmoothRatio * (elapsedTime / (1'000'000'000. / realgameticspersec)), 0, MaxSmoothRatio);
+	double ratioScale = elapsedTime / gametics;
+	int smoothratio = clamp(xs_CRoundToInt(MaxSmoothRatio * ratioScale), 0, MaxSmoothRatio);
+
+	if (cl_debugintrpl)
+	{
+		Printf("ototalclk: %d\ntotalclk: %d\ngametics: %.3f ms\nelapsedTime: %.3f ms\nratioScale: %f\nsmoothratio: %d\n",
+				ototalclk, totalclk, (gametics / 1'000'000.), (elapsedTime / 1'000'000.), ratioScale, smoothratio);
+	}
+
+	return smoothratio;
 }
 
 FString G_GetDemoPath()
diff --git a/source/core/gamecvars.cpp b/source/core/gamecvars.cpp
index ce7bbea74..a18bb86ce 100644
--- a/source/core/gamecvars.cpp
+++ b/source/core/gamecvars.cpp
@@ -90,6 +90,7 @@ CVARD(Bool, cl_slopetilting, false, CVAR_ARCHIVE, "enable/disable slope tilting"
 CVARD(Int, cl_showweapon, 1, CVAR_ARCHIVE, "enable/disable show weapons") // only implemented in Blood
 CVARD(Bool, cl_sointerpolation, true, CVAR_ARCHIVE, "enable/disable sector object interpolation") // only implemented in SW
 CVARD(Bool, cl_syncinput, false, CVAR_ARCHIVE, "enable/disable synchronized input with game's ticrate") // only implemented in SW
+CVARD(Bool, cl_debugintrpl, false, CVAR_NOSAVE, "print information regarding calculated smoothratio for interpolation") // only implemented in SW
 CUSTOM_CVARD(Int, cl_crosshairscale, 50, CVAR_ARCHIVE, "changes the size of the crosshair")
 {
 	if (self < 1) self = 1;
diff --git a/source/core/gamecvars.h b/source/core/gamecvars.h
index 68fcecf1e..716546d75 100644
--- a/source/core/gamecvars.h
+++ b/source/core/gamecvars.h
@@ -25,6 +25,7 @@ EXTERN_CVAR(Int, cl_weaponswitch)
 EXTERN_CVAR(Int, cl_crosshairscale)
 EXTERN_CVAR(Bool, cl_sointerpolation)
 EXTERN_CVAR(Bool, cl_syncinput)
+EXTERN_CVAR(Bool, cl_debugintrpl)
 
 EXTERN_CVAR(Bool, demorec_seeds_cvar)
 EXTERN_CVAR(Bool, demoplay_diffs)