diff --git a/voussoirkit/hms.py b/voussoirkit/hms.py
index 318483a..eff91a0 100644
--- a/voussoirkit/hms.py
+++ b/voussoirkit/hms.py
@@ -1,4 +1,5 @@
 import math
+import re
 import sys
 
 from voussoirkit import pipeable
@@ -21,6 +22,18 @@ def hms_to_seconds(hms) -> float:
         seconds += float(parts[0])
     return seconds
 
+def hms_letters_to_seconds(hms) -> float:
+    match = re.match(r'(?:(\d+)h)?(?:(\d+)m)?(\d+)s?', hms.strip())
+    if not match:
+        raise ValueError(f'{hms} does not match 00h00m00s pattern')
+    (hours, minutes, seconds) = match.groups()
+    seconds = int(seconds)
+    if hours:
+        seconds += int(hours) * 3600
+    if minutes:
+        seconds += int(minutes) * 60
+    return seconds
+
 def seconds_to_hms(seconds, force_minutes=False, force_hours=False) -> str:
     '''
     Convert integer number of seconds to an hh:mm:ss string.
@@ -38,11 +51,26 @@ def seconds_to_hms(seconds, force_minutes=False, force_hours=False) -> str:
     hms = ':'.join(f'{part:02d}' for part in parts)
     return hms
 
+def seconds_to_hms_letters(seconds, force_minutes=False, force_hours=False) -> str:
+    seconds = math.ceil(seconds)
+    (minutes, seconds) = divmod(seconds, 60)
+    (hours, minutes) = divmod(minutes, 60)
+    parts = []
+    if hours or force_hours:
+        parts.append(f'{hours:02d}h')
+    if hours or minutes or force_hours or force_minutes:
+        parts.append(f'{minutes:02d}m')
+    parts.append(f'{seconds:02d}s')
+    hms = ''.join(parts)
+    return hms
+
 def main(args):
     lines = pipeable.input_many(args, strip=True, skip_blank=True)
     for line in lines:
         if ':' in line:
             line = hms_to_seconds(line)
+        if 's' in line:
+            line = hms_letters_to_seconds(line)
         else:
             line = float(line)
             if line > 60: