The Cleveland Clinic reports that in general, a good one-minute heart rate recovery is 18 BPM or higher. However, this number greatly varies according to factors such as your age, general fitness, what exercise you just did, and other conditions.
Some research points to more specific recommendations for certain demographics. In one study, scientists measured the one-minute HRR of 2,428 adults aged 45-69. The median HRR was 17 BPM for the one-minute test. A one-minute HRR of 23 or better put study participants above the 75th percentile of all participants. And an HRR of 12 or less was a danger zone: Study participants who were in this abnormal range were four times more likely to die in the six years after the study was conducted.
For younger people or those who train more frequently, this 2014 study may be more applicable: In the study, scientists tested the one-, two-, and three-minute HRR of 274 elite male athletes. The average one-minute HRR was 26, with athletes over 18 coming in with an HRR of 29.5 compared to 22.4 for the adolescent athletes. After two minutes, the average HRR was 57.6.