diff --git a/docs/spec/tables/csv-table-auto-keyword.rst.txt b/docs/spec/tables/csv-table-auto-keyword.rst.txt
new file mode 100644
index 0000000..03de3b2
--- /dev/null
+++ b/docs/spec/tables/csv-table-auto-keyword.rst.txt
@@ -0,0 +1,8 @@
+.. csv-table:: Frozen Delights!
+   :header: "Treat", "Quantity", "Description"
+   :widths: auto
+
+   "Albatross", 2.99, "On a stick!"
+   "Crunchy Frog", 1.49, "If we took the bones out,
+   it wouldn't be crunchy, now would it?"
+   "Gannet Ripple", 1.99, "On a stick!"
diff --git a/docs/spec/tables/csv-table-auto-keyword.typ.txt b/docs/spec/tables/csv-table-auto-keyword.typ.txt
new file mode 100644
index 0000000..1ba092e
--- /dev/null
+++ b/docs/spec/tables/csv-table-auto-keyword.typ.txt
@@ -0,0 +1,21 @@
+#figure([
+  #table(
+    columns: 3,
+    table.header(
+      [Treat],
+      [Quantity],
+      [Description],
+    ),
+    [Albatross],
+    [2.99],
+    [On a stick!],
+    [Crunchy Frog],
+    [1.49],
+    [If we took the bones out,
+    it wouldn't be crunchy, now would it?],
+    [Gannet Ripple],
+    [1.99],
+    [On a stick!],
+  )],
+  caption: [Frozen Delights!],
+)
diff --git a/docs/spec/tables/csv-table-autolayout.rst.txt b/docs/spec/tables/csv-table-autolayout.rst.txt
new file mode 100644
index 0000000..821b39a
--- /dev/null
+++ b/docs/spec/tables/csv-table-autolayout.rst.txt
@@ -0,0 +1,7 @@
+.. csv-table:: Frozen Delights!
+   :header: "Treat", "Quantity", "Description"
+
+   "Albatross", 2.99, "On a stick!"
+   "Crunchy Frog", 1.49, "If we took the bones out,
+   it wouldn't be crunchy, now would it?"
+   "Gannet Ripple", 1.99, "On a stick!"
diff --git a/docs/spec/tables/csv-table-autolayout.typ.txt b/docs/spec/tables/csv-table-autolayout.typ.txt
new file mode 100644
index 0000000..1ba092e
--- /dev/null
+++ b/docs/spec/tables/csv-table-autolayout.typ.txt
@@ -0,0 +1,21 @@
+#figure([
+  #table(
+    columns: 3,
+    table.header(
+      [Treat],
+      [Quantity],
+      [Description],
+    ),
+    [Albatross],
+    [2.99],
+    [On a stick!],
+    [Crunchy Frog],
+    [1.49],
+    [If we took the bones out,
+    it wouldn't be crunchy, now would it?],
+    [Gannet Ripple],
+    [1.99],
+    [On a stick!],
+  )],
+  caption: [Frozen Delights!],
+)
diff --git a/docs/spec/tables/grid-table-with-widths.rst.txt b/docs/spec/tables/grid-table-with-widths.rst.txt
new file mode 100644
index 0000000..7fa8687
--- /dev/null
+++ b/docs/spec/tables/grid-table-with-widths.rst.txt
@@ -0,0 +1,14 @@
+.. table:: Truth table with grid-derived widths
+   :widths: grid
+
+   +-------+-------+-----------+
+   |   A   |   B   |  A and B  |
+   +=======+=======+===========+
+   | False | False | False     |
+   +-------+-------+-----------+
+   | True  | False | False     |
+   +-------+-------+-----------+
+   | False | True  | False     |
+   +-------+-------+-----------+
+   | True  | True  | True      |
+   +-------+-------+-----------+
diff --git a/docs/spec/tables/grid-table-with-widths.typ.txt b/docs/spec/tables/grid-table-with-widths.typ.txt
new file mode 100644
index 0000000..1060a40
--- /dev/null
+++ b/docs/spec/tables/grid-table-with-widths.typ.txt
@@ -0,0 +1,23 @@
+#figure([
+  #table(
+    columns: (7fr, 7fr, 11fr),
+    table.header(
+      [A],
+      [B],
+      [A and B],
+    ),
+    [False],
+    [False],
+    [False],
+    [True],
+    [False],
+    [False],
+    [False],
+    [True],
+    [False],
+    [True],
+    [True],
+    [True],
+  )],
+  caption: [Truth table with grid-derived widths],
+)
diff --git a/docs/spec/tables/grid-table.typ.txt b/docs/spec/tables/grid-table.typ.txt
index 2f8eee0..1bca093 100644
--- a/docs/spec/tables/grid-table.typ.txt
+++ b/docs/spec/tables/grid-table.typ.txt
@@ -1,5 +1,5 @@
 #table(
-  columns: (24fr, 12fr, 10fr, 10fr),
+  columns: 4,
   table.header(
     [Header row, column 1
     (header rows optional)],
diff --git a/docs/spec/tables/index.rst b/docs/spec/tables/index.rst
index e62a899..6b6e8cf 100644
--- a/docs/spec/tables/index.rst
+++ b/docs/spec/tables/index.rst
@@ -56,6 +56,72 @@ List table
    .. literalinclude:: list-table.typ.txt
       :language: typst
 
+List table with autolayout
+--------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: list-table-autolayout.rst.txt
+      :language: rst
+
+   .. literalinclude:: list-table-autolayout.typ.txt
+      :language: typst
+
+CSV table with autolayout
+-------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: csv-table-autolayout.rst.txt
+      :language: rst
+
+   .. literalinclude:: csv-table-autolayout.typ.txt
+      :language: typst
+
+CSV table with "auto" keyword
+-----------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: csv-table-auto-keyword.rst.txt
+      :language: rst
+
+   .. literalinclude:: csv-table-auto-keyword.typ.txt
+      :language: typst
+
+List table with "auto" keyword
+------------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: list-table-auto-keyword.rst.txt
+      :language: rst
+
+   .. literalinclude:: list-table-auto-keyword.typ.txt
+      :language: typst
+
+Simple table with explicit widths
+---------------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: simple-table-with-widths.rst.txt
+      :language: rst
+
+   .. literalinclude:: simple-table-with-widths.typ.txt
+      :language: typst
+
+Grid table with "grid" widths keyword
+-------------------------------------
+
+.. tab-set-code::
+
+   .. literalinclude:: grid-table-with-widths.rst.txt
+      :language: rst
+
+   .. literalinclude:: grid-table-with-widths.typ.txt
+      :language: typst
+
 References
 ==========
 
diff --git a/docs/spec/tables/list-table-auto-keyword.rst.txt b/docs/spec/tables/list-table-auto-keyword.rst.txt
new file mode 100644
index 0000000..5d9f610
--- /dev/null
+++ b/docs/spec/tables/list-table-auto-keyword.rst.txt
@@ -0,0 +1,17 @@
+.. list-table:: Frozen Delights!
+   :widths: auto
+   :header-rows: 1
+
+   * - Treat
+     - Quantity
+     - Description
+   * - Albatross
+     - 2.99
+     - On a stick!
+   * - Crunchy Frog
+     - 1.49
+     - If we took the bones out, it wouldn't be
+       crunchy, now would it?
+   * - Gannet Ripple
+     - 1.99
+     - On a stick!
diff --git a/docs/spec/tables/list-table-auto-keyword.typ.txt b/docs/spec/tables/list-table-auto-keyword.typ.txt
new file mode 100644
index 0000000..7c66551
--- /dev/null
+++ b/docs/spec/tables/list-table-auto-keyword.typ.txt
@@ -0,0 +1,21 @@
+#figure([
+  #table(
+    columns: 3,
+    table.header(
+      [Treat],
+      [Quantity],
+      [Description],
+    ),
+    [Albatross],
+    [2.99],
+    [On a stick!],
+    [Crunchy Frog],
+    [1.49],
+    [If we took the bones out, it wouldn't be
+    crunchy, now would it?],
+    [Gannet Ripple],
+    [1.99],
+    [On a stick!],
+  )],
+  caption: [Frozen Delights!],
+)
diff --git a/docs/spec/tables/list-table-autolayout.rst.txt b/docs/spec/tables/list-table-autolayout.rst.txt
new file mode 100644
index 0000000..fbd4e3d
--- /dev/null
+++ b/docs/spec/tables/list-table-autolayout.rst.txt
@@ -0,0 +1,16 @@
+.. list-table:: Frozen Delights!
+   :header-rows: 1
+
+   * - Treat
+     - Quantity
+     - Description
+   * - Albatross
+     - 2.99
+     - On a stick!
+   * - Crunchy Frog
+     - 1.49
+     - If we took the bones out, it wouldn't be
+       crunchy, now would it?
+   * - Gannet Ripple
+     - 1.99
+     - On a stick!
diff --git a/docs/spec/tables/list-table-autolayout.typ.txt b/docs/spec/tables/list-table-autolayout.typ.txt
new file mode 100644
index 0000000..7c66551
--- /dev/null
+++ b/docs/spec/tables/list-table-autolayout.typ.txt
@@ -0,0 +1,21 @@
+#figure([
+  #table(
+    columns: 3,
+    table.header(
+      [Treat],
+      [Quantity],
+      [Description],
+    ),
+    [Albatross],
+    [2.99],
+    [On a stick!],
+    [Crunchy Frog],
+    [1.49],
+    [If we took the bones out, it wouldn't be
+    crunchy, now would it?],
+    [Gannet Ripple],
+    [1.99],
+    [On a stick!],
+  )],
+  caption: [Frozen Delights!],
+)
diff --git a/docs/spec/tables/simple-table-with-widths.rst.txt b/docs/spec/tables/simple-table-with-widths.rst.txt
new file mode 100644
index 0000000..b27495d
--- /dev/null
+++ b/docs/spec/tables/simple-table-with-widths.rst.txt
@@ -0,0 +1,11 @@
+.. table:: Truth table with explicit widths
+   :widths: 10 10 15
+
+   =====  =====  =======
+     A      B    A and B
+   =====  =====  =======
+   False  False  False
+   True   False  False
+   False  True   False
+   True   True   True
+   =====  =====  =======
diff --git a/docs/spec/tables/simple-table-with-widths.typ.txt b/docs/spec/tables/simple-table-with-widths.typ.txt
new file mode 100644
index 0000000..5722539
--- /dev/null
+++ b/docs/spec/tables/simple-table-with-widths.typ.txt
@@ -0,0 +1,23 @@
+#figure([
+  #table(
+    columns: (10fr, 10fr, 15fr),
+    table.header(
+      [A],
+      [B],
+      [A and B],
+    ),
+    [False],
+    [False],
+    [False],
+    [True],
+    [False],
+    [False],
+    [False],
+    [True],
+    [False],
+    [True],
+    [True],
+    [True],
+  )],
+  caption: [Truth table with explicit widths],
+)
diff --git a/docs/spec/tables/simple-table.typ.txt b/docs/spec/tables/simple-table.typ.txt
index af60978..c7dd537 100644
--- a/docs/spec/tables/simple-table.typ.txt
+++ b/docs/spec/tables/simple-table.typ.txt
@@ -1,5 +1,5 @@
 #table(
-  columns: (5fr, 5fr, 7fr),
+  columns: 3,
   table.header(
     [A],
     [B],
diff --git a/src/rst2typst/writer.py b/src/rst2typst/writer.py
index 9db0a85..f21bf7c 100644
--- a/src/rst2typst/writer.py
+++ b/src/rst2typst/writer.py
@@ -540,11 +540,19 @@ def depart_table(self, node: nodes.table):
         self.body.append("\n")
 
     def visit_tgroup(self, node: nodes.tgroup):
-        cols = [
-            f"{colspec['colwidth']}fr" if colspec != "auto" else "auto"
-            for colspec in node.findall(nodes.colspec)
-        ]
-        self.body.append(f"{self._hi.indent}columns: ({', '.join(cols)}),\n")
+        table_node = node.parent
+        colwidths_given = "colwidths-given" in table_node.get("classes", [])
+
+        if colwidths_given:
+            # Use explicit fractional widths when the author specified them.
+            cols = [
+                f"{colspec['colwidth']}fr" for colspec in node.findall(nodes.colspec)
+            ]
+            self.body.append(f"{self._hi.indent}columns: ({', '.join(cols)}),\n")
+        else:
+            # Typst defaults to columns: 1, so we must always emit the column
+            # count; the integer shorthand sizes all columns automatically.
+            self.body.append(f"{self._hi.indent}columns: {node['cols']},\n")
 
     def depart_tgroup(self, node: nodes.tgroup):
         pass