Three ball sizes cover the whole of grassroots football in this country, and nearly all the confusion sits in the two seasons either side of each jump. A child moves up an age group, the coach mentions a new ball, and nobody is quite sure whether the one in the shed still counts.
The short version first, then the questions we get asked at the counter.
The sizes, and roughly who uses them
| Size | Typical age groups | Circumference | Weight |
|---|---|---|---|
| Size 3 | Around Under-7 to Under-9 | Approx. 58–61cm | Approx. 300–320g |
| Size 4 | Around Under-10 to Under-14 | Approx. 63.5–66cm | Approx. 350–390g |
| Size 5 | Under-15 and above, including adults | Approx. 68–70cm | Approx. 410–450g |
That age banding follows the general grassroots guidance the FA and county FAs work to, and it is what most junior leagues in England run on. It is guidance, though, not law — individual leagues and tournaments set their own rules, and the one that governs your Sunday morning is the one on your league's website.
You will also see size 1 and size 2 balls. Those are skills balls and mini balls: useful for close control drills and for toddlers kicking about in the garden, not for matches.
The questions we actually get asked
My son is in Under-10s but he is small for his age — can he stay on a size 3?
For matches, no — the league decides the match ball, and turning up with the wrong size is a wasted trip. For practice at home, a smaller, lighter ball is genuinely useful while he adjusts, particularly for goalkeepers and for anyone learning to strike properly. Just do not let the gap get wide, or the first match with the size 4 comes as a shock.
Is a size 4 just a shrunken size 5?
No. It is smaller and meaningfully lighter, and the weight is the part that matters. A junior striking a ball that is too heavy compensates by leaning back, swinging from the hip and toe-poking, and those habits are hard to unpick later. The size step-ups exist so the technique develops on something the child can actually move.
Match ball or training ball — is there a real difference?
There is, and it is mostly construction. Training balls tend to be machine-stitched or moulded with a tougher outer, built to survive being kicked against a wall on tarmac. Match balls are lighter in feel, hold their shape and pressure better and fly more predictably, but they wear faster on rough surfaces. For a family buying one ball, a decent training ball in the right size is the sensible purchase. Clubs buying in bulk usually want training balls for the sessions and a couple of match balls kept back for game day.
What about futsal?
Futsal balls are a different thing again. A futsal ball is typically a size 4 by circumference but heavier, with a dampened bounce so it stays on the floor of a sports hall instead of pinging off the ceiling. If a child has futsal at school or a winter indoor league, a standard size 4 is not a substitute.
Do schools use the same sizes?
Broadly, yes — primary PE tends to sit on size 3 and 4, and secondary on 4 and 5 — but PE departments buy what suits the space and the lesson, and a lot of primary school sessions use lightweight or foam balls indoors. If you are buying for a school, ask the PE lead what they actually use rather than working from age alone.
How hard should it be pumped up?
Softer than most people inflate them, and always to the pressure printed next to the valve on the ball itself. Over-inflated balls hurt to head, hurt to strike and split their seams sooner. Check with a gauge rather than by squeezing, and check before matches in cold weather — pressure drops as the temperature does, which is why the ball that felt right in September feels flat in December.
How long should a ball last?
That depends almost entirely on the surface. A ball used on grass will outlive the same ball used on a playground several times over. The two things that kill footballs early are sitting inflated in a hot car or a freezing shed, and being used as a seat. Let some air out for long storage, keep it out of direct sun, and rinse the mud off rather than letting it dry on.
Buying for a season rather than a single Sunday
If you are buying once and want it to cover the most ground, buy for the age group they are in now, not the one they are moving up to. A child playing with a ball that is too big and heavy for a year does not get used to it; they just get worse at striking it. When the jump comes, buy the new size a few weeks early and use it in the garden so the first match is not the first contact.
For clubs and coaches, the useful spread is a bag of the current age group's size for sessions, a couple of the size above for the group heading up next season, and one or two smaller skills balls for close-control work — those are worth their place at any age.
Check your league's handbook before you buy, then have a look at the footballs and match balls we stock. If you are kitting a child out from scratch, the football section is mostly boots, and we are happy to answer a quick question if you are stuck between two sizes.