diff --git a/src/power.cpp b/src/power.cpp
--- a/src/power.cpp
+++ b/src/power.cpp
@@ -22,10 +22,40 @@
 #include "unit_p.h"
 
 #include <KI18n/klocalizedstring.h>
+#include <QtMath>
 
 namespace KUnitConversion
 {
 
+class DecibelUnitPrivate : public UnitPrivate
+{
+public:
+    DecibelUnitPrivate(CategoryId categoryId, UnitId id, qreal multiplier,
+                       const QString &symbol, const QString &description,
+                       const QString &matchString, const KLocalizedString &symbolString,
+                       const KLocalizedString &realString, const KLocalizedString &integerString)
+        : UnitPrivate(categoryId, id, multiplier,
+                      symbol, description,
+                      matchString, symbolString,
+                      realString, integerString)
+    {}
+
+    qreal toDefault(qreal value) const override
+    {
+        // y[W] = 10 ^ (value[dBW] / 10)
+        return qPow(10, value / 10) * m_multiplier;
+    }
+
+    qreal fromDefault(qreal value) const override
+    {
+        // y[dBW] = 10 * log10(value[W])
+        // QMath only provides natural log function (qLn) and constant M_LN10 = ln(10)
+        // We use the logarithm change of base: log10(x) = ln(x) / ln(10)
+        return 10 * qLn(value / m_multiplier) / M_LN10;
+    }
+};
+
+
 Power::Power() : CustomCategory(PowerCategory, i18n("Power"), i18n("Power"))
 {
     KLocalizedString symbolString = ki18nc("%1 value, %2 unit symbol (power)", "%1 %2");
@@ -205,6 +235,40 @@
                              symbolString,
                              ki18nc("amount in units (real)", "%1 horsepowers"),
                              ki18ncp("amount in units (integer)", "%1 horsepower", "%1 horsepowers")));
+
+    //Logarithmic Power Units (http://en.wikipedia.org/wiki/Decibel)
+
+    addUnit(CustomUnit(new DecibelUnitPrivate(PowerCategory, DecibelKilowatt, 1000,
+                                              i18nc("power unit symbol", "dBk"),
+                                              i18nc("unit description in lists", "decibel kilowatts"),
+                                              i18nc("unit synonyms for matching user input", "dBk;dBkW;dB(kW)"),
+                                              symbolString,
+                                              ki18nc("amount in units (real)", "%1 decibel kilowatts"),
+                                              ki18ncp("amount in units (integer)", "%1 decibel kilowatt", "%1 decibel kilowatts"))));
+
+    addUnit(CustomUnit(new DecibelUnitPrivate(PowerCategory, DecibelWatt, 1,
+                                              i18nc("power unit symbol", "dBW"),
+                                              i18nc("unit description in lists", "decibel watts"),
+                                              i18nc("unit synonyms for matching user input", "dBW;dB(W)"),
+                                              symbolString,
+                                              ki18nc("amount in units (real)", "%1 decibel watts"),
+                                              ki18ncp("amount in units (integer)", "%1 decibel watt", "%1 decibel watts"))));
+
+    addCommonUnit(CustomUnit(new DecibelUnitPrivate(PowerCategory, DecibelMilliwatt, 0.001,
+                                                    i18nc("power unit symbol", "dBm"),
+                                                    i18nc("unit description in lists", "decibel milliwatts"),
+                                                    i18nc("unit synonyms for matching user input", "dBm;dBmW;dB(mW)"),
+                                                    symbolString,
+                                                    ki18nc("amount in units (real)", "%1 decibel milliwatts"),
+                                                    ki18ncp("amount in units (integer)", "%1 decibel milliwatt", "%1 decibel milliwatts"))));
+
+    addUnit(CustomUnit(new DecibelUnitPrivate(PowerCategory, DecibelMicrowatt, 1e-6,
+                                              i18nc("power unit symbol", "dBµW"),
+                                              i18nc("unit description in lists", "decibel microwatts"),
+                                              i18nc("unit synonyms for matching user input", "dBuW;dBµW;dB(uW);dB(µW)"),
+                                              symbolString,
+                                              ki18nc("amount in units (real)", "%1 decibel microwatts"),
+                                              ki18ncp("amount in units (integer)", "%1 decibel microwatt", "%1 decibel microwatts"))));
 }
 
 } // KUnitConversion namespace
diff --git a/src/unit.h b/src/unit.h
--- a/src/unit.h
+++ b/src/unit.h
@@ -140,6 +140,8 @@
     Yottawatt = 10000, Zettawatt, Exawatt, Petawatt, Terawatt, Gigawatt, Megawatt, Kilowatt,
     Hectowatt, Decawatt, Watt, Deciwatt, Centiwatt, Milliwatt, Microwatt, Nanowatt, Picowatt,
     Femtowatt, Attowatt, Zeptowatt, Yoctowatt, Horsepower,
+    /** @since 5.62 */
+    DecibelKilowatt, DecibelWatt, DecibelMilliwatt, DecibelMicrowatt,
 
     // Time
     Yottasecond = 11000, Zettasecond, Exasecond, Petasecond, Terasecond, Gigasecond, Megasecond,