diff --git a/programs/src/installer/components.cpp b/programs/src/installer/components.cpp
index 66e5a4a..7e47395 100644
--- a/programs/src/installer/components.cpp
+++ b/programs/src/installer/components.cpp
@@ -39,7 +39,7 @@ Component g_components[] = {
     { "sdk", "Montauk SDK",
       "Native development kit under 0:/sdk: headers, libc, libstdc++ and tools",
       -1, "sdk/include", {"sdk", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "gcc", "GNU C/C++ compiler (gcc, g++)",
       "Native GCC 14 with C and C++ support (needs binutils)",
@@ -47,7 +47,7 @@ Component g_components[] = {
       {"sdk/bin/gcc.elf", "sdk/bin/g++.elf", "sdk/bin/cpp.elf",
        "sdk/libexec", "sdk/lib/gcc", nullptr},
       true, CI_BINUTILS,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "binutils", "GNU binutils (as, ld, ar, ...)",
       "Assembler, linker and object file tools",
@@ -58,82 +58,82 @@ Component g_components[] = {
        "sdk/bin/strings.elf", "sdk/bin/addr2line.elf", "sdk/bin/c++filt.elf",
        "sdk/bin/elfedit.elf", nullptr},
       true, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "tcc", "Tiny C Compiler",
       "Lightweight single-pass C compiler (tcc) with its own headers",
       CI_SDK, "sdk/tcc", {"sdk/tcc", "os/tcc.elf", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "lua", "Lua 5.4",
       "Lua interpreter (lua) with static library and headers",
       CI_SDK, "sdk/lua", {"sdk/lua", "os/lua.elf", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "games", "Games & demos",
       "Games and graphics demos",
       -1, nullptr, {nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "doom", "DOOM",
       "id Software's DOOM on the doomgeneric engine",
       CI_GAMES, "apps/doom", {"apps/doom", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "2048", "2048",
       "Sliding tile puzzle game",
       CI_GAMES, "apps/2048", {"apps/2048", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "rpgdemo", "RPG demo",
       "Top-down RPG game engine demo",
       CI_GAMES, "apps/rpgdemo", {"apps/rpgdemo", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "mandelbrot", "Mandelbrot",
       "Fractal explorer",
       CI_GAMES, "apps/mandelbrot", {"apps/mandelbrot", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "office", "Office & productivity",
       "Document, spreadsheet and PDF applications",
       -1, nullptr, {nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "wordprocessor", "Word Processor",
       "Rich text documents with printing support",
       CI_OFFICE, "apps/wordprocessor", {"apps/wordprocessor", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "spreadsheet", "Spreadsheet",
       "Formula-based spreadsheet",
       CI_OFFICE, "apps/spreadsheet", {"apps/spreadsheet", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "pdfviewer", "PDF Viewer",
       "PDF document viewer",
       CI_OFFICE, "apps/pdfviewer", {"apps/pdfviewer", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "internet", "Internet apps",
       "Optional network applications",
       -1, nullptr, {nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "wikipedia", "Wikipedia",
       "Wikipedia reader (GUI app and wiki CLI)",
       CI_INTERNET, "apps/wikipedia", {"apps/wikipedia", "os/wiki.elf", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "weather", "Weather",
       "Weather forecast app",
       CI_INTERNET, "apps/weather", {"apps/weather", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "irc", "IRC client",
       "Command-line IRC client",
       CI_INTERNET, "os/irc.elf", {"os/irc.elf", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "printing", "Printing support",
       "Print spooler daemon (printd), printer setup app and print tools",
@@ -141,17 +141,17 @@ Component g_components[] = {
       {"os/printd.elf", "os/printctl.elf", "os/printersapplet.lib",
        "apps/printers", nullptr},
       false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "httpd", "HTTP server (experimental)",
       "Experimental web server (httpd) with 0:/www content",
       -1, "os/httpd.elf", {"os/httpd.elf", "www", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 
     { "sdr", "SDR tools (experimental)",
       "RTL-SDR software defined radio demo (sdr CLI)",
       -1, "os/sdr.elf", {"os/sdr.elf", nullptr}, false, -1,
-      false, false, false, false, 0 },
+      false, false, false, false, 0, 0 },
 };
 
 const int g_component_count = CI_COUNT;
@@ -235,6 +235,7 @@ void components_init() {
         Component& c = g_components[i];
         c.expanded = false;
         c.bytes = 0;
+        c.total_bytes = 0;
         c.base_present = c.probe ? rel_exists(c.probe) : false;
         c.present = c.base_present;
         c.checked = c.base_present;
@@ -356,13 +357,14 @@ void components_compute_sizes() {
             c.bytes += du_walk(c.paths[p], i);
     }
 
-    // Pure groups display the sum of their children.
-    for (int i = 0; i < g_component_count; i++) {
-        if (!comp_is_group(i)) continue;
-        for (int j = 0; j < g_component_count; j++)
-            if (g_components[j].parent == i)
-                g_components[i].bytes += g_components[j].bytes;
-    }
+    // Each row shows its own payload plus everything nested under it, so a
+    // parent (SDK, or a pure group) is never displayed smaller than the
+    // children listed beneath it. `bytes` stays exclusive for selection sums.
+    for (int i = 0; i < g_component_count; i++)
+        g_components[i].total_bytes = g_components[i].bytes;
+    for (int i = 0; i < g_component_count; i++)
+        for (int p = g_components[i].parent; p >= 0; p = g_components[p].parent)
+            g_components[p].total_bytes += g_components[i].bytes;
 
     g_sizes_ready = true;
 }
diff --git a/programs/src/installer/installer.h b/programs/src/installer/installer.h
index e408d0d..8561898 100644
--- a/programs/src/installer/installer.h
+++ b/programs/src/installer/installer.h
@@ -112,6 +112,7 @@ struct Component {
     bool present;          // this component (or a child) exists in the image
     bool base_present;     // own probe exists (parents with own payload)
     uint64_t bytes;        // exclusive payload size in the source image
+    uint64_t total_bytes;  // bytes plus everything nested under this row
 };
 
 extern Component g_components[];
diff --git a/programs/src/installer/render.cpp b/programs/src/installer/render.cpp
index 503fa6d..1ed65bf 100644
--- a/programs/src/installer/render.cpp
+++ b/programs/src/installer/render.cpp
@@ -280,8 +280,8 @@ static void render_components(Canvas& c, const mtk::Theme& theme) {
         right[0] = '\0';
         if (!comp.present)
             snprintf(right, sizeof(right), "not in image");
-        else if (components_sizes_ready() && comp.bytes > 0)
-            format_bytes(right, sizeof(right), comp.bytes);
+        else if (components_sizes_ready() && comp.total_bytes > 0)
+            format_bytes(right, sizeof(right), comp.total_bytes);
 
         if (right[0]) {
             int rw = text_width(right);