diff --git a/autotests/propertyinfotest.cpp b/autotests/propertyinfotest.cpp
--- a/autotests/propertyinfotest.cpp
+++ b/autotests/propertyinfotest.cpp
@@ -130,8 +130,10 @@
         // make VisualStudio compiler happy: QChar(0x00B0) = "°"
         { Property::PhotoGpsLatitude,       true,  25,                      QStringLiteral("25") + QChar(0x00B0)},
         { Property::PhotoGpsLongitude,      true,  13.5,                    QStringLiteral("13.5") + QChar(0x00B0)},
-        { Property::PhotoExposureTime,      true,  0.0015625,               QStringLiteral("0.00156")},
-        { Property::PhotoExposureBiasValue, true,  0.3333333,               QStringLiteral("0.333")},
+        { Property::PhotoExposureTime,      true,  0.0015625,               QStringLiteral("1/640")},
+        { Property::PhotoExposureBiasValue, true,  0.3333333,               QStringLiteral("1/3")},
+        { Property::PhotoExposureBiasValue, true,  -0.3333333,              QStringLiteral("-1/3")},
+        { Property::PhotoExposureBiasValue, true,  1.2,                     QStringLiteral("1.2")},
         { Property::ReplayGainAlbumGain,    true,  -9.90,                   QStringLiteral("-9.9")},
         { Property::ReplayGainAlbumPeak,    true,  1.512,                   QStringLiteral("1.51")},
         { Property::ReplayGainAlbumGain,    true,  10.44,                   QStringLiteral("10.4")},
diff --git a/src/formatstrings.cpp b/src/formatstrings.cpp
--- a/src/formatstrings.cpp
+++ b/src/formatstrings.cpp
@@ -158,6 +158,20 @@
     return i18nc("Symbol of frames per second, with space", "%1 fps", QLocale().toString(round(value.toDouble() * 100) / 100));
 }
 
+QString FormatStrings::formatAsDoubleOrRational(const QVariant& value)
+{
+    auto val = value.toDouble();
+    if (abs(val) > 0.35 || qFuzzyIsNull(val)) {
+        return QLocale().toString(value.toDouble(), 'g', 3);
+    } else {
+        if (val < 0) {
+            return i18nc("Negative rational number, absolute value smaller than 1", "-1/%1", round(-1.0 / val));
+        } else {
+            return i18nc("Positive rational number, absolute value smaller than 1", "1/%1", round(1.0 / val));
+        }
+    }
+}
+
 QString FormatStrings::formatAspectRatio(const QVariant& value)
 {
     return i18nc("Aspect ratio, normalized to one", "%1:1", QLocale().toString(round(value.toDouble() * 100) / 100));
diff --git a/src/formatstrings_p.h b/src/formatstrings_p.h
--- a/src/formatstrings_p.h
+++ b/src/formatstrings_p.h
@@ -51,6 +51,8 @@
 
     static QString formatAsFrameRate(const QVariant& value);
 
+    static QString formatAsDoubleOrRational(const QVariant& value);
+
     static QString formatAspectRatio(const QVariant& value);
 
 };
diff --git a/src/propertyinfo.cpp b/src/propertyinfo.cpp
--- a/src/propertyinfo.cpp
+++ b/src/propertyinfo.cpp
@@ -251,14 +251,14 @@
             d->name = QStringLiteral("photoExposureBiasValue");
             d->displayName = i18nc("@label EXIF", "Photo Exposure Bias");
             d->valueType = QVariant::Double;
-            d->formatAsString = &FormatStrings::formatDouble;
+            d->formatAsString = &FormatStrings::formatAsDoubleOrRational;
             break;
 
         case Property::PhotoExposureTime:
             d->name = QStringLiteral("photoExposureTime");
             d->displayName = i18nc("@label EXIF", "Photo Exposure Time");
             d->valueType = QVariant::Double;
-            d->formatAsString = &FormatStrings::formatDouble;
+            d->formatAsString = &FormatStrings::formatAsDoubleOrRational;
             break;
 
         case Property::PhotoFlash: