Published June 21, 2026
Why one reading is never enough
Blood pressure moves all day. It climbs when you stand up, when you're in pain, when you're late for an appointment and the parking lot was full. A single reading in a clinic (often the most stressful moment of the week) tends to run high for exactly that reason. There's even a name for it: white-coat hypertension.
What your doctor wants is the pattern. A week or two of readings taken calmly at home, at the same times each day, tells them far more than any one number can. A log is how you hand them that pattern instead of a guess.
What to write down
Every blood pressure reading has two numbers and most monitors show a third. Capture all of them, plus a couple of details that explain the outliers.
- The date and time. A 7 a.m. reading and a 9 p.m. reading aren't the same data point.
- Systolic, the top number: the pressure while your heart beats.
- Diastolic, the bottom number: the pressure while it rests between beats.
- Pulse, if your monitor shows it: a useful second signal your doctor may ask about.
- A short note when something's off: slept badly, missed a dose, double espresso, felt dizzy. That's the context that turns a scary spike into an explainable one.
How to take an accurate reading at home
The reading is only as good as the setup. Sit for five minutes before you start, feet flat on the floor, back supported, arm resting on a table at about the height of your heart. Don't talk during the measurement, and skip caffeine or a cigarette for half an hour beforehand.
Use the same arm each time and note which one. Take two readings about a minute apart; if they're far apart, take a third. Write down what you see, not a rounded or rosier version. The log only helps if it's honest.
The seven-day stretch your doctor is actually reading
The protocol behind the grid is short: two readings a minute apart, sitting, morning and evening, for seven days, then discard day one and average everything left. Most printable logs stop at the grid and never say it.
The UK's national guideline writes the rule out plainly (NICE NG136): two consecutive measurements at least a minute apart with the person seated, recorded twice daily, ideally morning and evening, for at least four days and ideally seven, with the first day's measurements discarded and the rest averaged. The CDC's home-measurement guidance matches the setup, with your back supported, five quiet minutes first, and at least two readings one or two minutes apart at the same time each day.
That average is the number your doctor reads. Not the scariest reading on the page, and not the calmest one. Seven days of morning-and-evening pairs gives roughly two dozen readings to average instead of one measurement taken in a hallway.
What the numbers mean
These are the standard American Heart Association categories, useful for reading your own log at a glance. They are a reference, not a diagnosis. Your personal target may be different, especially with kidney disease, diabetes, or a heart condition, so ask your doctor what range they want for you.
- Normal: below 120 and below 80.
- Elevated: 120–129 and below 80.
- High, stage 1: 130–139 or 80–89.
- High, stage 2: 140 or higher, or 90 or higher.
- Call for help now: above 180 or above 120, especially with chest pain, shortness of breath, or trouble speaking. That's an emergency, not a log entry.
Why a home average is read against a different line
Home numbers and clinic numbers are not scored against the same threshold, which trips people up the moment they compare their own log to the categories above.
At the point where hypertension gets diagnosed, guidelines treat a home average of 135/85 as the equivalent of a clinic 140/90. Lower down, the two scales converge: a clinic 130/80 corresponds to a home average of 130/80, and 120/80 to 120/80. So the familiar line that home readings always run lower only holds near the top of the range.
For your log, that means one thing: compare your seven-day average to the target your doctor wrote in the box at the top of the sheet, not to a number you saw somewhere online.
What three filled-in rows look like
A blank grid is easy. Knowing what belongs in the Notes column is the part people ask about, so here are three rows filled the way they should be.
Watch what the middle row does. Without its note, a 152/94 is a frightening number with nothing attached to it. With it, your doctor knows a dose was missed and coffee was involved, and can weigh the reading against that. Write the note while it is happening. Nobody remembers on Friday what went on at Monday bedtime.
- Mon 6/1 · 7:10 a.m. · 128 / 78 · pulse 64 · Sat five minutes, left arm
- Mon 6/1 · 9:20 p.m. · 152 / 94 · pulse 88 · Missed the evening dose, coffee at 7
- Tue 6/2 · 7:05 a.m. · 126 / 76 · pulse 62 · Back on schedule
If your doctor asked for lying and standing readings
Sometimes the request is different: take it lying down, then take it again standing. That is a check for orthostatic hypotension, the drop that causes the head-swim when someone gets up too fast. It matters most for older adults and for anyone on blood pressure or heart medication.
The standard way to do it is to lie flat and rest at least five minutes, take a reading, then stand and take another at one minute, two minutes, and three minutes. Write all four in the log and mark the position next to each one. The consensus definition of a drop worth reporting is a fall of at least 20 points systolic or 10 points diastolic within three minutes of standing.
Bring the numbers, not the conclusion. A drop that size, especially alongside dizziness, is something to tell the doctor about rather than something to act on by changing a dose yourself.
The version that keeps itself up to date
A paper sheet is a good start. The trouble is keeping it current — every new prescription, every changed dose, every appointment. KeptWell does the same job without the re-copying: upload a photo of a document and it reads the page, pulls out the details, and keeps one living record the whole family can see.
Common questions about home blood pressure logs
- How often should I check my blood pressure at home?
- Many doctors ask for twice a day (morning and evening) for a week or two before a visit, then less often once things are stable. Follow the schedule your own clinician gives you; this log has room for daily readings either way.
- What time of day should I take it?
- Pick consistent times and stick to them. A common pattern is once in the morning before medication and food, and once in the evening. What matters most is comparing like with like, so the same two times each day beats random checks. If the doses themselves are hard to keep straight, build a medication schedule and keep the two sheets together.
- What's a normal home blood pressure reading?
- As a general reference, a home average below 120/80 is considered normal, and a home average of 135/85 or higher is the level that corresponds to a clinic reading of 140/90. Below that threshold the two scales line up, so home readings do not always run lower than clinic ones. Your own target may differ depending on your age and health conditions, so treat the categories above as a guide and confirm your goal with your doctor.
- Should I write down my pulse too?
- If your monitor shows it, yes. There's a column for it. Pulse is a quick second signal, and your doctor may ask about it alongside your pressure, especially if you take heart-rate medication.
- Do I really need both the top and bottom numbers?
- Yes. The systolic (top) and diastolic (bottom) numbers describe different things, and treatment decisions can hinge on either one. Record both every time, even when one looks fine.
- How do I create a blood pressure log?
- A blood pressure log needs six columns: date, time, systolic, diastolic, pulse, and a notes column for anything that would explain an odd reading. Print the sheet above, or rule the same six columns on a blank page. Then fill it the way clinicians ask for it: two readings a minute apart, morning and evening, for seven days, with the target range your doctor gave you written at the top. The notes column is the one people leave off, and the one that makes the page worth bringing.
- How many days of readings should I bring?
- Seven days is the usual ask and four is the practical minimum. Guidelines tell clinicians to leave the first day out of the average, so do the same on your sheet and average everything else. That average is the number your doctor reads, not the highest reading on the page.
More printables
Printable blood sugar log
A daily glucose log with space for before- and after-meal readings.
Printable medication list
One page that holds every medication, dose, and reason in one place.
Vital signs & symptom tracker
Temperature, pulse, weight, and how the day actually felt.
Emergency medical information sheet
The fridge-door page for a heart or blood pressure history: conditions, medications, allergies, and who to call.
Or skip the re-copying entirely
A paper log works until the readings pile up and someone has to type them into a portal. KeptWell keeps the record for you, and reads the after-visit summary, the medication changes, and the labs that go with it, so the whole family is looking at the same picture.
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