For standard adult CPR, each cycle is 30 chest compressions followed by 2 rescue breaths (a 30:2 ratio).

Quick Scoop: CPR Cycles

  • Adults and adolescents: 30 compressions → 2 breaths.
  • One “cycle” of CPR = 30:2, repeated continuously.
  • Keep compressions fast and hard: about 100–120 per minute.
  • If you are not trained or are uncomfortable giving breaths, hands-only CPR (continuous compressions) is recommended for adults until help arrives.

Why 30:2 Is Used

Modern CPR guidelines use 30 compressions and 2 breaths to balance blood circulation (compressions) with oxygen delivery (breaths). Too many breaths can actually reduce blood flow and are no longer recommended (older ratios like 15:5 or 5:1 are outdated).

Age Differences (Brief)

Health-care and advanced guidelines adjust the ratio in some child and infant scenarios (for example, 15:2 with two trained rescuers), but for a single lay rescuer the 30:2 pattern is broadly used across ages.

Important Safety Note

This is general information and does not replace formal CPR training.
For real emergencies, always:

  1. Call or activate your local emergency number.
  2. Start CPR as you were trained.
  3. Use an AED as soon as it is available.

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Learn how many compressions and breaths you should do for each cycle of CPR, the standard 30:2 ratio, and why this guideline matters for effective lifesaving response.

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