READING LOOKUP

Blood pressure 155 over 50 to 110

A top number of 155 is in the Stage 2 range on its own, so every 155 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.

155 over what? The quick answer

155/50 to 110: Stage 2 hypertension

Every 155 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.

Reading	Category	Pulse pressure	MAP
155/50	Stage 2	105	85
155/51	Stage 2	104	85.7
155/52	Stage 2	103	86.3
155/53	Stage 2	102	87
155/54	Stage 2	101	87.7
155/55	Stage 2	100	88.3
155/56	Stage 2	99	89
155/57	Stage 2	98	89.7
155/58	Stage 2	97	90.3
155/59	Stage 2	96	91
155/60	Stage 2	95	91.7
155/61	Stage 2	94	92.3
155/62	Stage 2	93	93
155/63	Stage 2	92	93.7
155/64	Stage 2	91	94.3
155/65	Stage 2	90	95
155/66	Stage 2	89	95.7
155/67	Stage 2	88	96.3
155/68	Stage 2	87	97
155/69	Stage 2	86	97.7
155/70	Stage 2	85	98.3
155/71	Stage 2	84	99
155/72	Stage 2	83	99.7
155/73	Stage 2	82	100.3
155/74	Stage 2	81	101
155/75	Stage 2	80	101.7
155/76	Stage 2	79	102.3
155/77	Stage 2	78	103
155/78	Stage 2	77	103.7
155/79	Stage 2	76	104.3
155/80	Stage 2	75	105
155/81	Stage 2	74	105.7
155/82	Stage 2	73	106.3
155/83	Stage 2	72	107
155/84	Stage 2	71	107.7
155/85	Stage 2	70	108.3
155/86	Stage 2	69	109
155/87	Stage 2	68	109.7
155/88	Stage 2	67	110.3
155/89	Stage 2	66	111
155/90	Stage 2	65	111.7
155/91	Stage 2	64	112.3
155/92	Stage 2	63	113
155/93	Stage 2	62	113.7
155/94	Stage 2	61	114.3
155/95	Stage 2	60	115
155/96	Stage 2	59	115.7
155/97	Stage 2	58	116.3
155/98	Stage 2	57	117
155/99	Stage 2	56	117.7
155/100	Stage 2	55	118.3
155/101	Stage 2	54	119
155/102	Stage 2	53	119.7
155/103	Stage 2	52	120.3
155/104	Stage 2	51	121
155/105	Stage 2	50	121.7
155/106	Stage 2	49	122.3
155/107	Stage 2	48	123
155/108	Stage 2	47	123.7
155/109	Stage 2	46	124.3
155/110	Stage 2	45	125

What to do with a 155 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 155/70 high blood pressure?

155/70 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 155/80 high blood pressure?

155/80 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 155/90 high blood pressure?

155/90 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 155/80?

About 105 mmHg. Mean arterial pressure is the bottom number plus a third of the pulse pressure: 80 + 75/3. The pulse pressure is 75.

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.

SOURCES

Jones DW, et al. 2025 AHA/ACC/AANP/AAPA/ABC/ACCP/ACPM/AGS/AMA/ASPC/NMA/PCNA/SGIM Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults (Circulation, 2025): Blood pressure categories (normal under 120/80, elevated 120 to 129 and under 80, stage 1 130 to 139 or 80 to 89, stage 2 140 or 90 and higher); the higher category counts when the two numbers disagree; severe hypertension above 180/120; PREVENT for risk estimation
Understanding Blood Pressure Readings (American Heart Association, reviewed August 14, 2025): Category chart for adults; severe hypertension and hypertensive emergency rows; call 911 above 180/120 with symptoms

Track this automatically with BP Log.

The free iPhone app times two readings a minute apart, averages them, keeps your morning and evening numbers apart, and builds a report for your doctor.

Other ways to track: printable log now, desktop and Excel coming soon