diff --git a/src/wifi/model/spectrum-wifi-phy.cc b/src/wifi/model/spectrum-wifi-phy.cc
index 3fd0716ff..a2d052372 100644
--- a/src/wifi/model/spectrum-wifi-phy.cc
+++ b/src/wifi/model/spectrum-wifi-phy.cc
@@ -482,4 +482,33 @@ SpectrumWifiPhy::GetBand (uint16_t bandWidth, uint8_t bandIndex)
   return band;
 }
 
+WifiSpectrumBand
+SpectrumWifiPhy::ConvertHeRuIndices (uint16_t channelWidth, HeRu::SubcarrierRange range) const
+{
+  WifiSpectrumBand convertedIndices;
+  uint32_t nGuardBands = static_cast<uint32_t> (((2 * GetGuardBandwidth (channelWidth) * 1e6) / GetBandBandwidth ()) + 0.5);
+  uint32_t centerFrequencyIndex = 0;
+  switch (channelWidth)
+    {
+    case 20:
+      centerFrequencyIndex = (nGuardBands / 2) + 6 + 122;
+      break;
+    case 40:
+      centerFrequencyIndex = (nGuardBands / 2) + 12 + 244;
+      break;
+    case 80:
+      centerFrequencyIndex = (nGuardBands / 2) + 12 + 500;
+      break;
+    case 160:
+      centerFrequencyIndex = (nGuardBands / 2) + 12 + 1012;
+      break;
+    default:
+      NS_FATAL_ERROR ("ChannelWidth " << channelWidth << " unsupported");
+      break;
+    }
+  convertedIndices.first = centerFrequencyIndex + range.first;
+  convertedIndices.second = centerFrequencyIndex + range.second;
+  return convertedIndices;
+}
+
 } //namespace ns3
diff --git a/src/wifi/model/spectrum-wifi-phy.h b/src/wifi/model/spectrum-wifi-phy.h
index 219cb16d6..7ec9a2bd2 100644
--- a/src/wifi/model/spectrum-wifi-phy.h
+++ b/src/wifi/model/spectrum-wifi-phy.h
@@ -29,6 +29,7 @@
 #include "ns3/antenna-model.h"
 #include "ns3/spectrum-channel.h"
 #include "ns3/spectrum-model.h"
+#include "ns3/wifi-spectrum-value-helper.h"
 #include "wifi-phy.h"
 
 namespace ns3 {
@@ -188,6 +189,15 @@ private:
    */
   Ptr<SpectrumValue> GetTxPowerSpectralDensity (uint16_t centerFrequency, uint16_t channelWidth, double txPowerW, WifiModulationClass modulationClass) const;
 
+  /**
+   * \param channelWidth the total channel width (MHz) used for the OFDMA transmission
+   * \param range the subcarrier range of the HE RU
+   * \return the converted indices
+   *
+   * This is a helper function to convert HE RU indices, which are relative to the center frequency subcarrier, to the indices used by the Spectrum model.
+   */
+  WifiSpectrumBand ConvertHeRuIndices (uint16_t channelWidth, HeRu::SubcarrierRange range) const;
+
   /**
    * Perform run-time spectrum model change
    */