diff -r f41d02c129e5 -r 7212b980a527 src/EditRecipeTab7.cpp
--- a/src/EditRecipeTab7.cpp	Thu Aug 11 10:50:18 2022 +0200
+++ b/src/EditRecipeTab7.cpp	Wed Aug 17 14:30:33 2022 +0200
@@ -187,6 +187,38 @@
 }
 
 
+void EditRecipe::calcBU()
+{
+    double BUGU = GetBUGU();
+    ui->buguEdit->setValue(BUGU);
+    ui->est_buguEdit->setValue(BUGU);
+    ui->est_buguShow->setValue(BUGU);
+    if (BUGU < 0.32)
+	ui->buguResult->setText(tr("Very malty and sweet"));
+    else if (BUGU < 0.43)
+	ui->buguResult->setText(tr("Malty, sweet"));
+    else if (BUGU < 0.52)
+	ui->buguResult->setText(tr("Balanced"));
+    else if (BUGU < 0.63)
+	ui->buguResult->setText(tr("Hoppy, bitter"));
+    else
+	ui->buguResult->setText(tr("Very hoppy, very bitter"));
+
+    double og = recipe->est_og;
+    double fg = recipe->est_fg;
+    double ibu = recipe->est_ibu;
+
+    if (fg < 1.002)    /* Can't be too low for this */
+	fg = 1.002;
+
+    double bure = ibu / ((0.1808 * Utils::sg_to_plato(og)) + (0.8192 * Utils::sg_to_plato(fg)));
+    qDebug() << "BU:RE" << bure << recipe->est_fg << recipe->est_ibu;
+    ui->est_bufguEdit->setValue(bure);
+    ui->est_bufguShow->setValue(bure);
+
+}
+
+
 void EditRecipe::calcWater()
 {
     double liters = 0;
@@ -383,18 +415,7 @@
 	chloride = wg_chloride + RA;
     }
 
-    double BUGU = GetBUGU();
-    ui->buguEdit->setValue(BUGU);
-    if (BUGU < 0.32)
-	ui->buguResult->setText(tr("Very malty and sweet"));
-    else if (BUGU < 0.43)
-	ui->buguResult->setText(tr("Malty, sweet"));
-    else if (BUGU < 0.52)
-	ui->buguResult->setText(tr("Balanced"));
-    else if (BUGU < 0.63)
-	ui->buguResult->setText(tr("Hoppy, bitter"));
-    else
-	ui->buguResult->setText(tr("Very hoppy, very bitter"));
+    calcBU();
 
     double OptSO4Clratio = GetOptSO4Clratio();
     ui->so4clEdit->setValue(OptSO4Clratio);