diff --git a/unitdc.rc b/unitdc.rc
index d0faa5f..2f858d5 100644
--- a/unitdc.rc
+++ b/unitdc.rc
@@ -1,5 +1,10 @@
 @base(iu)
 
+@base(s)
+0 (s) 60 @derived(min)
+0 (s) 3600 @derived(h)
+0 (s) 86400 @derived(d)
+
 @base(m)
 0 (m) 1e3 @derived(km)
 0 (m) 1e-2 @derived(cm)
@@ -9,6 +14,9 @@
 0 (m) 1e-12 @derived(pm)
 
 0 (m) 1 3.280839895 / @derived(ft)
+0 (m) 1 39.37007874 / @derived(in)
+0 (m) 1 1.093613298 / @derived(yd)
+0 (m) 1 0.0006213712 / @derived(mi)
 
 @base(degC)
 0 (degC) 273.15 @derived(K)
@@ -21,6 +29,7 @@ _-5 9 / 32 * (degC) 5 9 / @derived(degF)
 0 (l) 1e-3 @derived(ml)
 0 (l) 1e-6 @derived(ul)
 0 (l) 1e-9 @derived(nl)
+0 (l) 3.785411784 @derived(gal)
 
 0 (mol) 1 (l) / 1 @derived(M)
 0 (mol) 1 (l) / 1e-3 @derived(mM)
@@ -38,3 +47,18 @@ _-5 9 / 32 * (degC) 5 9 / @derived(degF)
 
 0 (g) 1 (mol) / 1 @derived(Da)
 0 (g) 1 (mol) / 1e3 @derived(kDa)
+
+@base(J)
+0 (J) 1e3 @derived(kJ)
+0 (J) 1e-3 @derived(mJ)
+0 (J) 1e-6 @derived(uJ)
+0 (J) 1e-9 @derived(nJ)
+
+0 (J) 1 (s) / 1 @derived(W)
+0 (J) 1 (s) / 1e-3 @derived(mW)
+0 (J) 1 (s) / 1e3 @derived(kW)
+0 (J) 1 (s) / 1e6 @derived(MW)
+
+0 (s) 1 (W) * 3600 @derived(Wh)
+0 (s) 1 (W) * 3600e3 @derived(kWh)
+0 (s) 1 (W) * 3600e6 @derived(MWh)