diff --git a/dcalc/ArcDelayCalc.cc b/dcalc/ArcDelayCalc.cc
index bb7ea5c1..15f5a581 100644
--- a/dcalc/ArcDelayCalc.cc
+++ b/dcalc/ArcDelayCalc.cc
@@ -130,6 +130,12 @@ ArcDcalcArg::drvrNet(const Network *network) const
   return network->net(drvr_pin_);
 }
 
+float
+ArcDcalcArg::inSlewFlt() const
+{
+  return delayAsFloat(in_slew_);
+}
+
 void
 ArcDcalcArg::setInSlew(Slew in_slew)
 {
diff --git a/dcalc/CcsSimDelayCalc.cc b/dcalc/CcsSimDelayCalc.cc
index b4a9ea05..7c4a6224 100644
--- a/dcalc/CcsSimDelayCalc.cc
+++ b/dcalc/CcsSimDelayCalc.cc
@@ -188,7 +188,7 @@ CcsSimDelayCalc::gateDelays(ArcDcalcArgSeq &dcalc_args,
     GateTableModel *table_model = gateTableModel(dcalc_arg.arc(), dcalc_ap);
     if (table_model && dcalc_arg.parasitic()) {
       OutputWaveforms *output_waveforms = table_model->outputWaveforms();
-      Slew in_slew = dcalc_arg.inSlew();
+      float in_slew = delayAsFloat(dcalc_arg.inSlew());
       if (output_waveforms
           // Bounds check because extrapolating waveforms does not work for shit.
           && output_waveforms->slewAxis()->inBounds(in_slew)
@@ -293,7 +293,7 @@ CcsSimDelayCalc::simulate(ArcDcalcArgSeq &dcalc_args)
     ceff_[drvr_idx] = load_cap_;
     // voltageTime is always for a rising waveform so 0.0v is initial voltage.
     drvr_current_[drvr_idx] =
-      output_waveforms_[drvr_idx]->voltageCurrent(dcalc_arg.inSlew(),
+      output_waveforms_[drvr_idx]->voltageCurrent(delayAsFloat(dcalc_arg.inSlew()),
                                                   ceff_[drvr_idx], 0.0);
   }
   // Initial time depends on ceff which impact delay, so use a sim step
@@ -304,7 +304,7 @@ CcsSimDelayCalc::simulate(ArcDcalcArgSeq &dcalc_args)
   initNodeVoltages();
 
   // voltageTime is always for a rising waveform so 0.0v is initial voltage.
-  double time_begin = output_waveforms_[0]->voltageTime(dcalc_args[0].inSlew(),
+  double time_begin = output_waveforms_[0]->voltageTime(dcalc_args[0].inSlewFlt(),
                                                         ceff_[0], 0.0);
   // Limit in case load voltage waveforms don't get to final value.
   double time_end = time_begin + maxTime();
@@ -361,7 +361,7 @@ CcsSimDelayCalc::timeStep()
 double
 CcsSimDelayCalc::maxTime()
 {
-  return (*dcalc_args_)[0].inSlew()
+  return (*dcalc_args_)[0].inSlewFlt()
     + (drive_resistance_ + resistance_sum_) * load_cap_ * 2;
 }
 
@@ -632,7 +632,7 @@ CcsSimDelayCalc::updateCeffIdrvr()
         drvr_current_[i] = 0.0;
       else
         drvr_current_[i] =
-          output_waveforms_[i]->voltageCurrent((*dcalc_args_)[i].inSlew(),
+          output_waveforms_[i]->voltageCurrent((*dcalc_args_)[i].inSlewFlt(),
                                                ceff_[i], v);
     }
     else {
@@ -648,7 +648,7 @@ CcsSimDelayCalc::updateCeffIdrvr()
         drvr_current_[i] = 0.0;
       else
         drvr_current_[i] =
-          output_waveforms_[i]->voltageCurrent((*dcalc_args_)[i].inSlew(),
+          output_waveforms_[i]->voltageCurrent((*dcalc_args_)[i].inSlewFlt(),
                                                ceff_[i], v);
     }
   }
@@ -763,7 +763,7 @@ CcsSimDelayCalc::inputWaveform(const Pin *in_pin,
     DriverWaveform *driver_waveform = port->driverWaveform(in_rf);
     const Vertex *in_vertex = graph_->pinLoadVertex(in_pin);
     DcalcAnalysisPt *dcalc_ap = corner->findDcalcAnalysisPt(min_max);
-    Slew in_slew = graph_->slew(in_vertex, in_rf, dcalc_ap->index());
+    float in_slew = delayAsFloat(graph_->slew(in_vertex, in_rf, dcalc_ap->index()));
     LibertyLibrary *library = port->libertyLibrary();
     float vdd;
     bool vdd_exists;
diff --git a/include/sta/ArcDelayCalc.hh b/include/sta/ArcDelayCalc.hh
index 62ce4817..b826def6 100644
--- a/include/sta/ArcDelayCalc.hh
+++ b/include/sta/ArcDelayCalc.hh
@@ -72,6 +72,7 @@ public:
   Edge *edge() const { return edge_; }
   const TimingArc *arc() const { return arc_; }
   Slew inSlew() const { return in_slew_; }
+  float inSlewFlt() const;
   void setInSlew(Slew in_slew);
   const Parasitic *parasitic() { return parasitic_; }
   void setParasitic(const Parasitic *parasitic);