Blood Pressure 77 Over 40–70: Which Are OK?

With an upper value of 77, the answer depends on your lower number. Here are all readings, sorted by what they mean.

On its own, a systolic (upper) value of 77 mmHg is Low blood pressure by the international categories (2023 ESH guideline) and low under the 2025 AHA/ACC guideline. The worse of your two numbers decides the category, so a raised diastolic (lower) value moves a 77 reading up: every listed reading stays in the same category.

Blood pressure chart with the row for an upper value of 77: which lower values are ideal, normal, high normal or hypertension

Low blood pressure 77/40 to 77/70

77/40
77/41
77/42
77/43
77/44
77/45
77/46
77/47
77/48
77/49
77/50
77/51
77/52
77/53
77/54
77/55
77/56
77/57
77/58
77/59
77/70

What to do with a reading of 77 over …

Clearly low. Measure again; if it is confirmed, or if you have any symptoms (dizziness, fainting, confusion), contact a doctor promptly — the same day. Keep your readings in a free blood pressure log and read how to measure correctly.

Sources: ESH 2023 guideline · AHA/ACC 2025 guideline.

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