diff --git a/svgpathtools/paths2svg.py b/svgpathtools/paths2svg.py
index 10dfa55..f9c461f 100644
--- a/svgpathtools/paths2svg.py
+++ b/svgpathtools/paths2svg.py
@@ -100,7 +100,7 @@ def disvg(paths=None, colors=None, filename=None, stroke_widths=None,
           mindim=600, dimensions=None, viewbox=None, text=None,
           text_path=None, font_size=None, attributes=None,
           svg_attributes=None, svgwrite_debug=False,
-          paths2Drawing=False):
+          paths2Drawing=False, baseunit='px'):
     """Creates (and optionally displays) an SVG file.
 
     REQUIRED INPUTS:
@@ -313,12 +313,16 @@ def disvg(paths=None, colors=None, filename=None, stroke_widths=None,
         dy += 2*margin_size*dy + extra_space_for_style
         viewbox = "%s %s %s %s" % (xmin, ymin, dx, dy)
 
-        if dx > dy:
-            szx = str(mindim) + 'px'
-            szy = str(int(ceil(mindim * dy / dx))) + 'px'
+        if mindim is None:
+            szx = "{}{}".format(dx, baseunit)
+            szy = "{}{}".format(dy, baseunit)
         else:
-            szx = str(int(ceil(mindim * dx / dy))) + 'px'
-            szy = str(mindim) + 'px'
+            if dx > dy:
+                szx = str(mindim) + baseunit
+                szy = str(int(ceil(mindim * dy / dx))) + baseunit
+            else:
+                szx = str(int(ceil(mindim * dx / dy))) + baseunit
+                szy = str(mindim) + baseunit 
         dimensions = szx, szy
 
     # Create an SVG file
@@ -428,7 +432,7 @@ def wsvg(paths=None, colors=None, filename=None, stroke_widths=None,
          mindim=600, dimensions=None, viewbox=None, text=None,
          text_path=None, font_size=None, attributes=None,
          svg_attributes=None, svgwrite_debug=False,
-         paths2Drawing=False):
+         paths2Drawing=False, baseunit='px'):
     """Create SVG and write to disk.
 
     Note: This is identical to `disvg()` except that `openinbrowser`
@@ -447,7 +451,7 @@ def wsvg(paths=None, colors=None, filename=None, stroke_widths=None,
                  text_path=text_path, font_size=font_size,
                  attributes=attributes, svg_attributes=svg_attributes,
                  svgwrite_debug=svgwrite_debug,
-                 paths2Drawing=paths2Drawing)
+                 paths2Drawing=paths2Drawing, baseunit=baseunit)
     
     
 def paths2Drawing(paths=None, colors=None, filename=None,
@@ -456,7 +460,7 @@ def paths2Drawing(paths=None, colors=None, filename=None,
                   margin_size=0.1, mindim=600, dimensions=None,
                   viewbox=None, text=None, text_path=None,
                   font_size=None, attributes=None, svg_attributes=None,
-                  svgwrite_debug=False, paths2Drawing=True):
+                  svgwrite_debug=False, paths2Drawing=True, baseunit='px'):
     """Create and return `svg.Drawing` object.
 
     Note: This is identical to `disvg()` except that `paths2Drawing`
@@ -474,4 +478,4 @@ def paths2Drawing(paths=None, colors=None, filename=None,
                  text_path=text_path, font_size=font_size,
                  attributes=attributes, svg_attributes=svg_attributes,
                  svgwrite_debug=svgwrite_debug,
-                 paths2Drawing=paths2Drawing)
+                 paths2Drawing=paths2Drawing, baseunit=baseunit)