The steps
- Count the places. For each Mass, set how many lectors and how many extraordinary ministers of Holy Communion it needs, and add the feast days.
- Enter the ministers. Paste the list with the ministries each person is commissioned for; many people are both lectors and communion ministers.
- Record preferences and limits. Tick each person's usual Mass, set a monthly limit for anyone who asks, and add dates away.
- Build and read the open places. Build the quarter. Any place left open comes with the reason, such as everyone trained already serving that weekend.
- Send it out. Print the rota by Mass for the sacristy, the rota by person for each minister, and paste the reminders into your own email.
Why a template breaks at forty people
A spreadsheet template is a grid: Masses down the side, roles across the top, names typed in. It works for a dozen people. The sample parish in the rota builder has 56 people and three Masses a weekend, which comes to 34 places a weekend and 442 over a quarter. Each place has to be checked against the person's dates away, their limit, the other roles they already hold that weekend, and their family. Typing one name into one cell can break three rules somewhere else in the quarter, and nothing in the grid says so.
PewRota fills all 442 places of the sample quarter with no rule broken, and turns range from 6 to 9 per person. It checks every place against every rule before it keeps a move, and checks the whole rota again at the end.
Worked example: an honest open place
Now send 18 of the sample parish's 26 communion ministers away for all of December, leaving 8. There are 52 communion minister places that month. PewRota fills 114 of all 136 places and leaves 22 open, each with its reason. The first one reads:
"26 people are trained for Extraordinary minister of Holy Communion, and none can take it: 18 away that day; 1 already serving at this service; 7 already serving another service that weekend."
That sentence is the one to take to the parish council: it says exactly who is missing, not that the schedule "did not work". The fix might be recruiting, or asking some ministers to tick that they are happy to serve twice on a weekend.
Feast days
Christmas, Holy Week and Easter need more ministers than an ordinary Sunday. Add each one as a one-off service with its own counts, and mark it prime so those turns are shared out evenly rather than falling to the same faithful few every year.
Common mistakes
- Giving one person two roles at one Mass when the list is short.
- Letting the 10:30 regulars do every major feast; prime Masses need sharing too.
- Ignoring a minister's monthly limit because they never complain.
- Rebuilding the whole quarter to fix one swap. Lock the places that are settled and rebuild the rest, or swap by hand.
Start with the sample parish in the rota builder, or read the fair rotation rules.
Sources
Checked on 28 September 2026. PewRota applies your parish's own policy; it ships no liturgical rules. Where your diocese, your parish safeguarding policy or your clergy say something different, follow them.
- PewRota's rota builder. Every example on this page is built by the same solver the rota builder runs, at build time, and pinned by a test.