Inflation pressure

Ball pressure in PSI and bar

A size 5 football holds 0.6-1.1 bar, roughly 9-16 psi. Squeezing by hand cannot tell the difference between the low and high end of that range; a needle gauge can. Pressure also falls as temperature drops, so the last check has to happen close to kickoff.

Size 5 football, quick spec

  • Range 0.6-1.1 bar
  • Range ~9-16 psi
  • 20°C to 5°C drop -0.04 to -0.05 bar
  • Re-check window 30 min before play

Bar to PSI conversion for a size 5 football

Bar and psi equivalents across the size 5 football pressure range (1 bar = 14.5 psi)
BarPSINote
0.6 bar8.7 psiMinimum spec
0.7 bar10.2 psiLow end, soft touch
0.8 bar11.6 psiCommon training pressure
0.9 bar13.1 psiCommon match pressure
1.0 bar14.5 psiFirm
1.1 bar16.0 psiMaximum spec
Pressure drop from 20 to 5 degrees Celsius Line chart from 0.90 bar at 20 degrees Celsius to about 0.85 bar at 5 degrees Celsius, a drop of 0.04 to 0.05 bar. 1.0 bar 0.85 0.6 20°C, 0.90 bar 5°C, ~0.85 bar
Fig. 1 — A ball holding 0.9 bar at 20°C loses roughly 0.04-0.05 bar once temperature falls to 5°C, landing near 0.85 bar.

Procedure: set pressure with a gauge

  1. 1

    Find the correct range for the ball size

    1 min

    Typical failure: using a futsal or volleyball pressure spec on a size 5 football.

  2. 2

    Seat the needle gauge in the valve straight

    1 min

    Typical failure: needle inserted at an angle, giving a false low reading and letting air escape.

  3. 3

    Read the gauge before adding any air

    1 min

    Typical failure: pumping first, then discovering the ball was already above spec.

  4. 4

    Pump in short bursts, re-checking the gauge

    3-5 min

    Typical failure: one continuous pump judged by feel instead of the gauge, overshooting 1.1 bar.

  5. 5

    Let the ball rest before the final reading

    2 min

    Typical failure: gauge read immediately after pumping, before internal pressure settles, overstating the true value.

  6. 6

    Re-check 30 minutes before kickoff, especially in cold weather

    5 min

    Typical failure: ball stored overnight at 5°C, arriving 0.04-0.05 bar under the pre-check reading.

Frequently asked

Bar or psi, which does my gauge use?
Either. Most needle gauges show one or both. Use the conversion table above: 0.6-1.1 bar equals roughly 9-16 psi for a size 5 football.
Does temperature really change pressure that much?
Yes. A ball at 0.9 bar at 20°C loses roughly 0.04-0.05 bar once it cools to 5°C, which is why the final check happens 30 minutes before play, not the night before.
Can I use the gauge on a bicycle pump?
Only if it reads in bar or psi at ball-appropriate low pressure. A dedicated ball needle gauge is more reliable for the 0.6-1.1 bar range than a pump gauge built for higher bicycle-tyre pressures.
What happens if the ball goes over 1.1 bar?
It is above the spec range for a size 5 football. Let air out in short bursts and re-check with the gauge until it falls back inside 0.6-1.1 bar.