diff --git a/avail_mem.py b/avail_mem.py
new file mode 100644
index 0000000..a644d76
--- /dev/null
+++ b/avail_mem.py
@@ -0,0 +1,40 @@
+#!python3
+
+import glob
+
+dirs = glob.glob("build/F3DEX3_*")
+if len(dirs) == 0:
+    raise RuntimeError("Please build one or more microcode versions in build/ first")
+
+smallestDmemAvail = 1000000
+smallestImemAvail = 1000000
+for dir in dirs:
+    toks = dir.split("/")
+    assert len(toks) == 2
+    ucodename = toks[1]
+    dmemAvail = None
+    imemAvail = None
+    with open(dir + "/" + ucodename + ".sym", "r") as f:
+        for l in f:
+            toks = l.strip().split(" ")
+            if len(toks) != 2:
+                continue
+            addr = int(toks[0], 16)
+            sym = toks[1]
+            if sym == "endVariableDmemUse":
+                dmemAvail = addr
+            elif sym == "rdpCmdBuffer1":
+                dmemAvail = addr - dmemAvail
+            elif sym == "totalImemUseUpTo1FC8":
+                imemAvail = addr
+            elif sym == "while_wait_dma_busy":
+                imemAvail = addr - imemAvail
+        if dmemAvail == None or imemAvail == None:
+            raise RuntimeError("Failed to extract addresses from sym file for " + ucodename)
+        print(f"{ucodename:<22}: DMEM avail: {dmemAvail:2d} bytes | IMEM avail: {imemAvail//4:2d} instr")
+        if dmemAvail < smallestDmemAvail:
+            smallestDmemAvail = dmemAvail
+        if imemAvail < smallestImemAvail:
+            smallestImemAvail = imemAvail
+
+print(f"Minimum               : DMEM avail: {smallestDmemAvail:2d} bytes | IMEM avail: {smallestImemAvail//4:2d} instr")