+CPR Course HQEnroll Now

CPR Compression Rate and Depth: The Numbers That Matter

AHA guidelines call for 100–120 compressions per minute, at least 2 inches deep (5 cm) in adults, with full chest recoil between compressions and interruptions kept under 10 seconds.

Quick facts
  • Rate: 100–120 compressions per minute
  • Depth (adult): at least 2 inches; not more than 2.4 inches
  • Depth (child): about 2 inches (one-third chest depth)
  • Depth (infant): about 1.5 inches

Why the rate range matters

Below 100/min, you don't generate enough flow. Above 120/min, the heart doesn't fully refill between compressions. The 'Stayin' Alive' tempo (103 BPM) hits the sweet spot.

Full recoil is non-negotiable

Leaning on the chest between compressions prevents the heart from refilling. Lift your hands fully without losing position.

Compression fraction

Aim for compressions during at least 60% of total CPR time. Plan pauses (rhythm checks, AED analysis, intubation) to be as short as possible.

Ready to get certified?Book your CPR course at Caring People RescueEnroll Now →

Frequently asked questions

How do I keep pace at 100–120 BPM?
Sing 'Stayin' Alive' (103 BPM) or use a metronome app.
Is 2 inches too deep?
No — adult guidelines explicitly require at least 2 inches. Going past 2.4 inches increases injury without improving outcomes.
What if I can't push that hard?
Switch rescuers every 2 minutes. Fatigue silently reduces depth even when rescuers feel fine.

Related guides

What Is CPR? A Plain-English Guide to Cardiopulmonary Resuscitation
CPR (cardiopulmonary resuscitation) combines chest compressions and rescue breaths to keep blood and oxygen moving during sudden cardiac arrest.
Hands-Only CPR
Hands-only CPR has two steps: call 911 and push hard and fast in the center of the chest at 100–120 BPM until help arrives. No breaths required.
AED Training
AED training teaches you to power on the device, attach pads, follow voice prompts, and deliver a shock safely. Most CPR courses include AED instruction.
Choking Response
For a conscious choking adult or child, use 5 back blows and 5 abdominal thrusts. If the person becomes unresponsive, start CPR immediately.