The grazing figure is the small part
A Connemara stands roughly at pony height and eats accordingly less than a horse, so keepers often start planning around half an acre to an acre of reasonable grazing per pony. That figure can work, particularly where hay supplements the field for part of the year and grazing is rotated, but it describes only what the pony eats. A property planned tightly around grazing alone ends up missing everything else a Connemara needs to live well.
Ask instead what the whole yard requires: a shelter or stable the pony can be brought into, a dry standing and feeding area, storage for hay and bedding, room for a farrier and veterinarian to work, and access for deliveries. On a very small plot those service areas can consume as much ground as the grazing itself, which is why total acreage and grazing acreage are different numbers.
Connemaras need movement, not just grass
This is an athletic pony, developed on rugged Irish ground and prized for jumping and versatility. A Connemara confined to a tiny paddock with nothing to do is a bored, inventive pony, and fencing and gates will be tested accordingly. Room to move matters for joints, digestion, weight, and temperament, so if grazing is limited, plan compensating exercise: regular ridden or driven work, in-hand walks, or a track layout around the field's edge that encourages walking between hay, water, and shelter points.
Companionship is non-negotiable in the space plan. A single pony alone in an acre is not adequately kept however good the grass is, so the land calculation must honestly include the companion pony or horse and its share of grazing, shelter, and winter hay. Two ponies sharing a well-rotated acre and a half, with hay support, will usually do better than the arithmetic for one pony suggests, provided droppings are removed and the ground rests.
Rich grass is the Connemara trap
Like other hardy native types, a Connemara extracts maximum value from pasture and can become overweight on ground that looks ordinary. Weight carried by a pony is strongly linked with hoof soreness and metabolic strain, so more lush grazing is not automatically better grazing. Strip grazing, rotating onto rested but not over-rich sections, and using a dry lot with hay for part of the day are normal tools for this breed, and they all require fencing flexibility within the land you have rather than simply more land.
Check local rules before finalising any plan, because minimum land and stable requirements for keeping equines vary and apply to ponies just as they do to horses. Walk the site in wet weather if you can; drainage decides how much of a small field survives winter use.
A complete small-pony layout
Picture the finished setup: rotated grazing the pony cannot gorge on freely, a dry lot with shelter and hay, an exercise routine that uses the pony's athleticism, a companion sharing the space, and fencing strong enough for a clever jumper. That combination, rather than a bare acreage figure, is what a Connemara actually needs. Putting the grazing rotation, dry-lot hours, and exercise schedule into KinsLe's Family Sharing means a pony whose weight depends on limits stays on those limits whoever is on duty.