Before you start

Residence registered with your municipio, which starts the twelve-month clock
The original licence plus a sworn translation, unless it is an EU one
Codice fiscale
A medical certificate from an authorised doctor

Step-by-step

1
Check the reciprocity list before assuming you can convert
Italy converts licences from EU and EEA states and from a defined list of others including Switzerland, Japan, South Korea, Canada, Argentina and Morocco. The US, UK, Australia, India and China are not on it. For those, conversion is impossible and the Italian exams are the only route.
OnlineWho: You
2
Treat the twelve-month grace period as a deadline
A foreign licence remains valid for one year from the date your residence is registered, accompanied by an International Driving Permit or a sworn translation. After that year it has no effect in Italy irrespective of its own expiry.
In personWho: You12 months from residence registration
3
Book the Motorizzazione, or use an autoscuola
Conversion is an appointment at the Motorizzazione Civile with licence, translation, medical certificate and fees. For the exam route an autoscuola handles the foglio rosa and the bookings, which in Rome is worth the fee for the administration alone.
In personWho: You
4
Prepare for a theory exam that is not offered in English
The quiz is available in Italian, German and French. It is thirty true/false statements with a low error tolerance and technical vocabulary. Budget for a course rather than self-study if Italian is not strong.
In personWho: You
5
Map the ZTLs you will actually cross
Rome has separate limited-traffic zones for the centro storico, the Tridente, Trastevere, San Lorenzo and Testaccio, with different active hours including evening-only zones. Check Roma Mobilità before each trip; hours shift seasonally and for events, and a single crossing is a separate fine.
OnlineWho: You
6
Check your vehicle against the Fascia Verde
The Fascia Verde is a large low-emission zone covering most of the city inside the ring road, with restrictions by Euro class and fuel type that tighten over time. It is separate from the ZTLs and being permitted in one says nothing about the other.
OnlineWho: You

Documents you’ll need

Original driving licence
Sworn translation or International Driving Permit
Passport and permesso di soggiorno or its receipt
Certificate of residence
Medical certificate from an authorised doctor
Codice fiscale and passport photographs

Things most newcomers don’t know

Rome's ZTLs are plural and each has its own timetable, which is how residents get fined too.

There is no single Rome ZTL. The centro storico zone, the Tridente, Trastevere, San Lorenzo and Testaccio each operate on their own hours, and several are active in the evening rather than during the day. Cameras record every crossing separately, so a wrong turn through two zones is two fines. Roma Mobilità publishes the live status; checking it before driving in is a habit locals actually have.

Source: Roma Capitale / Roma Servizi per la Mobilità

The Fascia Verde is a different animal from the ZTLs, and no payment makes a banned car eligible.

ZTLs restrict who may enter a small area at certain hours and can be satisfied with a permit. The Fascia Verde restricts which vehicles may circulate across a very large part of the city on emissions grounds, with the permitted Euro classes tightening on a published schedule. A resident permit for a ZTL does nothing about the Fascia Verde, and a car that fails it is simply not usable in most of Rome.

Source: Roma Capitale

Rome has three metro lines for a municipality the size of a small country, and that shapes where you should live.

The comune of Rome is the largest municipality in the European Union by area, and the metro covers a fraction of it because every excavation hits archaeology — Line C has been under construction for two decades for exactly that reason. The consequence is that the practical map of Rome is drawn by the metro and the regional rail lines, not by distance. A flat two kilometres from a station and a flat on top of one are different cities in commuting terms.

Source: ATAC; community-reported

The theory exam's withdrawal of English is the real barrier for Britons, Americans and Australians.

None of those countries can convert, so all of them must sit the Italian exams, and English was removed from the available languages. The questions are literal true/false statements where a single word flips the answer, and the road-sign vocabulary is not conversational Italian. Rome's autoscuole are used to foreign candidates and some run courses aimed at them; going it alone is the common and expensive mistake.

Source: Ministry of Infrastructure and Transport

Common mistakes to avoid

Assuming a single Rome ZTL with a single timetable.
Treating a ZTL permit as covering the Fascia Verde.
Letting the twelve-month post-registration licence grace period lapse.
Renting a flat by map distance rather than by distance to a metro or FL station.
Preparing the theory exam in English, which is no longer available.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.