How do I use this 24-hour clock worksheet?

Print the worksheet (it fits one page). Complete all 30 conversion exercises: 15 from 24-hour to 12-hour, and 15 from 12-hour to 24-hour. Check your answers against the answer key at the bottom. For extra practice, time yourself and try to finish in under 5 minutes.

Is this worksheet free to use?

Yes. You can print and use this worksheet for free — in classrooms, for tutoring, for homeschooling, or for personal practice. No signup or download required.

What grade level is this worksheet for?

The worksheet is designed for middle school and up (grades 5-12), but works for any age. The exercises range from straightforward whole-hour conversions (14:00 = 2 PM) to trickier ones with minutes (22:45 = 10:45 PM). A quick review of the add-12 / subtract-12 rule before starting is all most students need.

24-Hour Clock Worksheet — Printable Practice Sheet

Updated June 20, 2026

This free printable worksheet has 30 conversion exercises with a full answer key. Print it, work through both directions (24-hour to 12-hour and back), and check your answers. The only rule you need: for PM, add 12. For 24-hour above 12:59, subtract 12.

How to use this worksheet

Print on one page (designed to fit letter and A4). Start with Part A (24h to 12h), then Part B (12h to 24h). Check answers against the key. For a challenge, time yourself: can you finish all 30 in under 5 minutes? Use the converter if you get stuck on any time.

Part A: Convert 24-hour to 12-hour (15 exercises)

Write the 12-hour equivalent with AM or PM.

#	24-hour	12-hour	#	24-hour	12-hour
1	08:00	_______	9	13:00	_______
2	14:30	_______	10	19:45	_______
3	00:15	_______	11	22:00	_______
4	17:00	_______	12	03:30	_______
5	10:45	_______	13	16:15	_______
6	20:00	_______	14	00:00	_______
7	23:30	_______	15	11:59	_______
8	06:10	_______

Part B: Convert 12-hour to 24-hour (15 exercises)

Write the 24-hour equivalent using four digits with a colon.

#	12-hour	24-hour	#	12-hour	24-hour
16	3:00 PM	_______	24	7:30 AM	_______
17	9:15 AM	_______	25	10:45 PM	_______
18	12:00 PM	_______	26	2:20 AM	_______
19	5:30 PM	_______	27	6:00 PM	_______
20	11:00 PM	_______	28	1:45 PM	_______
21	12:30 AM	_______	29	4:10 PM	_______
22	8:00 PM	_______	30	12:00 AM	_______
23	4:00 PM	_______

Answer key

Part A answers

08:00 = 8:00 AM
14:30 = 2:30 PM
00:15 = 12:15 AM
17:00 = 5:00 PM
10:45 = 10:45 AM
20:00 = 8:00 PM
23:30 = 11:30 PM
06:10 = 6:10 AM
13:00 = 1:00 PM
19:45 = 7:45 PM
22:00 = 10:00 PM
03:30 = 3:30 AM
16:15 = 4:15 PM
00:00 = 12:00 AM (midnight)
11:59 = 11:59 AM

Part B answers

3:00 PM = 15:00
9:15 AM = 09:15
12:00 PM = 12:00 (noon stays 12)
5:30 PM = 17:30
11:00 PM = 23:00
12:30 AM = 00:30
8:00 PM = 20:00
4:00 PM = 16:00
7:30 AM = 07:30
10:45 PM = 22:45
2:20 AM = 02:20
6:00 PM = 18:00
1:45 PM = 13:45
4:10 PM = 16:10
12:00 AM = 00:00 (midnight)

For teachers and parents

Before handing out the worksheet

Review the add-12 / subtract-12 rule. Write 14:00 = 2 PM on the board and show the math. Emphasize that midnight is 00:00 (the trickiest one) and noon stays 12:00. Students who get those two right usually get everything else.

Challenge variations

Time the class: fastest correct sheet wins. Or have students create their own questions and exchange with a partner. For advanced practice, have students convert real train schedules or TV listings from a European website.

Common mistakes to watch for

Students often write 1:00 PM as 1:00 instead of 13:00 — remind them 24-hour time always uses two-digit hours. Another common slip: writing 12:00 AM as 12:00 instead of 00:00. Midnight is always 00:00 in 24-hour time.

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24-hour to 12-hour converter Full time conversion chart 24-hour clock examples for students How to read 24-hour time Travel time chart Military time converter