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Blood pressure 166 over 50 to 110

A top number of 166 is in the Stage 2 range on its own, so every 166 reading counts as Stage 2 whatever the bottom number.

Reviewed by Kaustubh Dabhadkar, MD, MPH, FACC, board-certified cardiologist. Categories follow the 2025 ACC/AHA guideline for adults.

166 over what? The quick answer

  • 166/50 to 110: Stage 2 hypertension

Every 166 reading

Pulse pressure is the top number minus the bottom number. MAP (mean arterial pressure) is the bottom number plus a third of the pulse pressure.

ReadingCategoryPulse pressureMAP
166/50Stage 211688.7
166/51Stage 211589.3
166/52Stage 211490
166/53Stage 211390.7
166/54Stage 211291.3
166/55Stage 211192
166/56Stage 211092.7
166/57Stage 210993.3
166/58Stage 210894
166/59Stage 210794.7
166/60Stage 210695.3
166/61Stage 210596
166/62Stage 210496.7
166/63Stage 210397.3
166/64Stage 210298
166/65Stage 210198.7
166/66Stage 210099.3
166/67Stage 299100
166/68Stage 298100.7
166/69Stage 297101.3
166/70Stage 296102
166/71Stage 295102.7
166/72Stage 294103.3
166/73Stage 293104
166/74Stage 292104.7
166/75Stage 291105.3
166/76Stage 290106
166/77Stage 289106.7
166/78Stage 288107.3
166/79Stage 287108
166/80Stage 286108.7
166/81Stage 285109.3
166/82Stage 284110
166/83Stage 283110.7
166/84Stage 282111.3
166/85Stage 281112
166/86Stage 280112.7
166/87Stage 279113.3
166/88Stage 278114
166/89Stage 277114.7
166/90Stage 276115.3
166/91Stage 275116
166/92Stage 274116.7
166/93Stage 273117.3
166/94Stage 272118
166/95Stage 271118.7
166/96Stage 270119.3
166/97Stage 269120
166/98Stage 268120.7
166/99Stage 267121.3
166/100Stage 266122
166/101Stage 265122.7
166/102Stage 264123.3
166/103Stage 263124
166/104Stage 262124.7
166/105Stage 261125.3
166/106Stage 260126
166/107Stage 259126.7
166/108Stage 258127.3
166/109Stage 257128
166/110Stage 256128.7

What to do with a 166 reading

Sit quietly for 5 minutes and take two readings a minute apart. If home readings average in this range over a week, share them with your doctor, who will look at them alongside your overall heart risk.

Readings move from minute to minute, and the first one usually runs a few points higher. The home measuring guide covers how to get a reading you can trust, and the 7-day home average turns a week of readings into the number your doctor uses. To check any reading, use the category checker.

Common questions

Is 166/70 high blood pressure?

166/70 is in the Stage 2 hypertension range of the 2025 ACC/AHA chart, because the top number is 140 or higher. One reading is a snapshot: the guideline places you by the average of readings taken on separate occasions.

Is 166/80 high blood pressure?

166/80 is in the Stage 2 hypertension range of the 2025 ACC/AHA chart, because the top number is 140 or higher. One reading is a snapshot: the guideline places you by the average of readings taken on separate occasions.

Is 166/90 high blood pressure?

166/90 is in the Stage 2 hypertension range of the 2025 ACC/AHA chart, because the top number is 140 or higher. One reading is a snapshot: the guideline places you by the average of readings taken on separate occasions.

What is the MAP of 166/80?

About 108.7 mmHg. Mean arterial pressure is the bottom number plus a third of the pulse pressure: 80 + 86/3. The pulse pressure is 86.

This page is educational and does not provide medical advice, diagnosis, or treatment. Categories describe numbers for adults; they are not a diagnosis, and they are not a substitute for care from your own doctor.
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