Soccer Ball Weight and Pressure: Official FIFA Standards

Referees carry a pressure gauge in their kit bag for a reason: a ball outside the legal window changes how the game plays, not just how it feels. Law 2 of the Laws of the Game sets the numbers everyone has to hit — 410 to 450 grams, 0.6 to 1.1 atmospheres of pressure at sea level — and every FIFA-sanctioned match ball has to clear that bar before kickoff.

The Governing Document: Law 2

IFAB writes and maintains the Laws of the Game, and Law 2 covers the ball itself:

• Spherical shape
• Leather or another suitable material
• Circumference between 68 cm and 70 cm (27 in to 28 in)
• Weight at kickoff between 410 g and 450 g (14 oz to 16 oz)
• Pressure of 0.6 to 1.1 atmospheres at sea level (60–110 kPa / 8.5–16 psi)

These figures apply at the start of the match. Rain changes things: a ball absorbs water as play goes on, which is why modern ball construction puts so much effort into waterproofing.

Official Specifications at a Glance

Specification	Minimum	Maximum
Weight	410 g (14 oz)	450 g (16 oz)
Circumference	68 cm (27 in)	70 cm (28 in)
Pressure (atm)	0.6 atm	1.1 atm
Pressure (psi)	approx. 8.5 psi	approx. 16 psi
Pressure (kPa)	60 kPa	110 kPa

Why Pressure Matters

Pressure changes how the ball behaves off the boot. Inflate it toward the low end and it feels softer, deforms more on contact, and doesn’t travel as far when struck. Toward the high end, it feels harder, springs back to shape faster, and carries further.

Referees check pressure with a calibrated gauge before every match. Most professional games use balls inflated toward the middle-to-upper end of the range, since players tend to want a firmer ball for passing and shooting accuracy.

Altitude Adjustments

At real altitude, La Paz, Bolivia sits over 3,600 meters above sea level, the air is thinner, so a ball travels farther and faster at the same inflation level. IFAB’s numbers are set for sea level, which means clubs and referees at altitude have to adjust pressure to get a comparable playing feel. It’s a real factor in high-altitude international fixtures, not a footnote.

How Waterlogging Affects the Ball

Old leather footballs soaked up water, sometimes adding 10 to 20 percent to their starting weight in a wet match. That’s the source of every story about “heavy balls” in winter football from decades past.

Modern match balls use synthetic panels with moisture-resistant coatings that cut water uptake sharply. The outer surface repels water, and the internal bladder (usually butyl or latex) holds air without significant loss during normal play.

Size Categories for Different Ages

Adults play with a Size 5 ball. Younger age groups use smaller balls suited to their physical development:

Ball Size	Typical Age Group	Circumference
Size 3	Under 8 / mini football	58–60 cm
Size 4	Under 8 to Under 12	63–66 cm
Size 5	Under 12 upwards / adult	68–70 cm

Matching ball size to age group matters for technique. A six-year-old trying to control a Size 5 ball builds poor habits and loses interest faster.

FIFA Quality Labels

FIFA runs a two-tier quality mark for balls:

• FIFA Quality — meets a baseline set of performance tests
• FIFA Quality Pro — the higher standard required for top professional competitions

Testing covers shape retention, water absorption, pressure loss, rebound, and circumference, so a ball performs consistently across 90 minutes and across a full season.