Drivers' hours calculator and checker
Enter your week from your tacho printout or your own notes and see where it goes over the driving, break, rest and working time limits listed below. No sign-up, and what you type stays on this device.
Rules: Assimilated and AETR
Which rules?
Before this week
For the 90-hour check. Leave it blank to skip that check.
Working time average
For the 48-hour average. Ask your employer which reference period it uses and the Monday it started: 17 weeks, or 26 under a collective or workforce agreement. Leave it out to skip this check.
Your weeks in this period
Hours of work in each week, leaving out breaks and POA. The week you are entering shows in its own row, and Start next week saves it there. Clearing the week keeps the rest. Each day of holiday or sick leave counts as 8 h. If you are self-employed, leave that box blank, because leave does not count for you.
Loading your week. If this stays, open the page again with a good signal.
Your week, Monday to Sunday
Time you don't enter counts as rest. Waiting counts as a POA (period of availability) only if its length was known in advance. If it was not, enter other work. If you were free to rest, enter a break.
Two more tools for your week
Found a defect on your walkaround? Get the drive-it-or-park-it answer with 3 free checks. Taking over a vehicle? See its full MOT record.
Try 3 free checks → Check an MOT history →Keep it on your phone
Open it once with a signal and it works without one after that. Your week is saved on this device until you clear it, but a browser can clear saved data, so don't treat this as your record.
On iPhone, tap Share then Add to Home Screen. On Android, look in the browser menu for Add to Home screen or Install app.
What it checks
| Assimilated and AETR | Limit |
|---|---|
| Daily driving, counted from the end of one rest to the start of the next | 9 h, or 10 h twice in a fixed week |
| Weekly driving, Monday 00:00 to Sunday 24:00 | 56 h |
| Driving over two weeks | 90 h |
| Breaks | 45 min after no more than 4 h 30 driving, or 15 min then 30 min |
| Daily rest, finished within 24 hours of the last rest ending. A rest under 11 h, or a spread of work over 13 h, uses a reduced rest | 11 h, or 3 h then 9 h, or 9 h up to 3 times between weekly rests |
| Weekly rest, started within 6 x 24 hours of the last one ending | 45 h, or 24 h reduced |
| Working time, assimilated and AETR | Limit |
|---|---|
| Work in a week, leaving out breaks and POA | 60 h |
| Average over your 17 or 26 week reference period | 48 h |
| Work with no break of at least 15 min | 6 h |
| Breaks in total | 30 min over 6 h of work, 45 min over 9 h |
| Work in any 24 hours with any work between 00:00 and 04:00 | 10 h, unless a collective or workforce agreement allows more |
| GB domestic | Limit |
|---|---|
| Driving in a working day, the 24 hours from starting duty | 10 h |
| Duty in a working day | 11 h, unless you did not drive that day, or drove no more than 4 h on every day of the week |
| Duty in a week | A warning over 48 h, because the limit is an average you can opt out of |
If something is over, the result shows what DVSA's table sets for it, where it sets anything, and what else could follow. Every result also lists what it did not check. Check a real dispute or a decision about a driver against the source.
Rules read on 31 October 2026 from GOV.UK's "Drivers' hours and tachographs: goods vehicles" guidance, sections 1 and 2, and for the GB working day the Transport Act 1968 and the Drivers' Hours (Goods Vehicles) (Modifications) Order 1986. Working time read on 1 November 2026 from that guidance's Annex 2 and the Road Transport (Working Time) Regulations 2005. Fines read the same day from DVSA's Enforcement Sanctions Policy, May 2026.
Contains public sector information licensed under the Open Government Licence v3.0. Roadworthy is an independent tool provider and is not affiliated with, or endorsed by, DVSA or any government body. This is guidance, not legal advice. It reads only what you type, and it cannot see your tachograph record.