12 & 24 Hour Time worksheets
Free printable 12 & 24 hour time worksheets with answer keys, converting between 12 and 24 hour time. Pick a grade below for ready-made PDFs, or generate a fresh one. Every answer is computed in code, so the key is never wrong.
What is 12 & 24 hour time?
24-hour time counts the hours from 00 to 23, so 3 pm is 15:00 (used on timetables and digital clocks). 12-hour time uses am and pm.
How to teach it
Line up 12- and 24-hour time: after midday, add 12 to the hour (1 pm = 13:00); midnight is 00:00, midday is 12:00. Practise converting both directions.
Worked example
Write 14:40 in 12-hour time (with am or pm).
Answer: 2:40 pm
Why: 14 − 12 = 2, so pm
Computed from a real worksheet, so it is correct.
Common mistake
Adding 12 to morning (am) times, and mishandling 12 am (→ 00:00) and 12 pm (stays 12:00).
What's inside
- Write 14:40 in 12-hour time (with am or pm).
- Write 6:05 am in 24-hour time.
- Write 15:50 in 12-hour time (with am or pm).
- Write 14:15 in 12-hour time (with am or pm).
- Write 1:30 am in 24-hour time.
- Write 21:40 in 12-hour time (with am or pm).
Sample questions. Each set (A, B, C…) has fresh numbers and a computed answer key.