How many days after my last period can I take a pregnancy test?

For a standard 28-day cycle, you can take a pregnancy test from day 24 onward (10 DPO — earliest possible, ~70% accuracy). The best day is day 28 — the first day of your expected period — when accuracy reaches approximately 99%. For irregular cycles, use the calculator above with your actual cycle length for a personalised date.

What is LMP in pregnancy?

LMP stands for Last Menstrual Period — the first day of your most recent period. Doctors use LMP as the standard starting point to calculate gestational age, due date and ovulation date. Pregnancy is typically dated from LMP, meaning you are considered '2 weeks pregnant' at the time of actual conception (ovulation).

Can I use the calculator for irregular periods?

Yes. The calculator has an adjustable cycle length field (21–45 days) and an adjustable luteal phase field (10–16 days). Enter your average cycle length for a personalised calculation. If your cycles vary by more than 7 days, check results for both your shortest and longest typical cycle lengths to get a test date range.

What is 10 DPO and why does it matter?

DPO stands for Days Past Ovulation. At 10 DPO, implantation is typically complete and hCG hormone levels have risen enough to be detected by sensitive pregnancy tests (sensitivity 20 mIU/mL or better). Most standard pharmacy tests are 99% accurate only from the day of a missed period (approximately 14 DPO), though early-response tests like First Response can detect pregnancy from 10–12 DPO.

Pregnancy test calculator ke results ko kaise samjhein? (Hindi)

Calculator mein apni LMP date enter karo. Results mein aapko milega: Ovulation date (jab egg release hota hai), Fertile window (pregnancy ke liye best 6 din), Earliest test date (10 DPO — sabse pehle test kar sakte hain), Best test date (period ke miss hone ke din — 99% accuracy), Aur estimated due date. Hindi mein poori guide ke liye hamare Hindi page par jaayein.

Free Calculator — Updated 2026

Pregnancy Test Calculator
by LMP Date — When to Test

Enter your Last Menstrual Period (LMP) date and instantly get your ovulation date, fertile window, earliest test date (10 DPO), best test date and estimated due date. Free, instant, no app needed.

Free Forever Works for Irregular Cycles DPO Tracker Included Instant Results No Registration

⚡ Quick Answer: When should I take a pregnancy test?

Take a pregnancy test on the first day of your missed period for ~99% accuracy. For a standard 28-day cycle, that is Day 28 (14 DPO). Sensitive early-response tests like First Response can detect pregnancy from 10 DPO (~70% accuracy). Enter your LMP below for your exact personal dates.

📅 Pregnancy Test Date Calculator 2026

Enter your LMP date · Adjust cycle length for irregular periods · Get instant dates

🩸 Last Period Date (LMP) First day of last period The first day your last period started

🔄 Cycle Length (days) 21–45 days Average days between periods (default: 28)

🌙 Luteal Phase (days) 10–16 days Days from ovulation to period (default: 14)

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Already have a test strip? Use our Test Line Scanner →

How It Works

How to Use the LMP Pregnancy Test Calculator

Four simple steps to get your personalised pregnancy test dates in under 60 seconds.

🩸

Enter Your LMP Date

Select the first day your last period started. This is your LMP — Last Menstrual Period date. If unsure, use an approximate date.

🔄

Set Your Cycle Length

Enter your average cycle length. Default is 28 days. Adjust to 21–45 days if your cycle is shorter or longer than average.

🌙

Set Luteal Phase (Optional)

The luteal phase is the time from ovulation to your period. Default is 14 days. Adjust between 10–16 days if known.

📅

Get Instant Results

Press Calculate for your ovulation date, fertile window, earliest test date (10 DPO), best test date and estimated due date.

DPO Accuracy Guide

Pregnancy Test Accuracy by Days Past Ovulation (DPO)

The earlier you test, the lower the accuracy. Here is when different test sensitivities can reliably detect hCG hormone.

8–9 DPO

~20–40%

Very early. hCG just beginning to rise. Only the most sensitive tests (6 mIU/mL) may detect. High false-negative risk.

10–11 DPO

~60–75%

Early test possible. First Response (6.5 mIU/mL) can detect at this stage. Still significant false-negative risk.

12–13 DPO

~80–90%

Good accuracy range. Most early-response tests (20 mIU/mL) will detect pregnancy here if implantation has occurred.

14+ DPO

~99%

Best accuracy. Day of missed period. Standard pharmacy tests (25 mIU/mL) are 99% accurate. Test with first morning urine.

Source: NIH — hCG Detection in Early Pregnancy | Mayo Clinic — Home Pregnancy Tests

Test Accuracy

Pregnancy Test Accuracy by Brand and DPO

Different test brands have different hCG sensitivity thresholds. Here is how accuracy compares.

Brand / Type	Sensitivity	Earliest Detection	On Missed Period
First Response Early Result	6.5 mIU/mL	10–11 DPO	99%
Clearblue Early Detection	10 mIU/mL	11–12 DPO	99%
Standard Strip Test	20–25 mIU/mL	12–14 DPO	99%
Prega News (India)	20 mIU/mL	12–14 DPO	99%
i-Can (India)	25 mIU/mL	14 DPO	99%
Blood Test (Quantitative β-hCG)	1–2 mIU/mL	8–10 DPO	99.9%
Online Quiz / Symptom Checker	Symptom-based only	Any time	60–80%

Source: Clearblue | NHS Pregnancy | WebMD

FAQs

Pregnancy Test Calculator — Frequently Asked Questions

How do I calculate when to take a pregnancy test?

Enter your LMP date above. The calculator works out your ovulation date (LMP + follicular phase), fertile window, earliest test date (ovulation + 10 days = 10 DPO) and best test date (first day of expected next period). Testing on the first day of your missed period gives ~99% accuracy with standard pharmacy tests. For a 28-day cycle, that is day 28.

How many days after my period can I take a pregnancy test?

For a 28-day cycle: Day 24 (10 DPO) is the absolute earliest (~70% accuracy with sensitive tests). Day 28 (14 DPO / missed period) is the best day (~99% accuracy). For cycles shorter than 28 days, ovulation happens earlier, so your best test date is earlier too — use the calculator above for your exact date.

What is LMP and why is it used for pregnancy calculation?

LMP stands for Last Menstrual Period — the first day of your most recent period. Doctors use LMP as the standard reference point because it is easier to know than the exact date of ovulation or conception. Gestational age, due dates and ovulation dates are all calculated from LMP. See: NHS — Calculating Your Due Date.

Can I use this calculator for irregular periods?

Yes. Adjust the Cycle Length field to your average cycle length (21–45 days). If your cycles vary by more than 7 days, run the calculator twice — once with your shortest typical cycle and once with your longest — to get a test date range. Also see our before missed period guide for irregular cycle advice.

What is the luteal phase and should I change it?

The luteal phase is the number of days from ovulation to the start of your next period. It is typically 12–16 days and does not vary as much as the follicular phase. The default setting of 14 days is correct for most women. Only change this if you have confirmed through basal body temperature (BBT) tracking that your luteal phase is shorter or longer.

Period miss hone ke kitne din baad test karna chahiye? (Hindi)

Period miss hone ke pehle din (Day 1 of missed period) test karna sabse accurate hota hai — lagbhag 99% accuracy. Agar aap 28-din cycle follow karti hain, to yeh LMP ke 28 din baad hoga. Sabse pehle subah ke pehle urine sample se test karo. Poori Hindi guide ke liye: Hindi Pregnancy Test Page →

What time of day should I take a pregnancy test?

Always test with first morning urine (FMU). hCG is most concentrated in the first urine of the day because you have not been drinking fluids overnight. Testing later in the day with diluted urine increases the chance of a false-negative result, especially in early pregnancy (10–12 DPO) when hCG levels are still low.

My test is negative but I have symptoms — what should I do?

A negative result with symptoms can mean: (1) You tested too early — hCG not yet detectable. Wait 48 hours and retest with first morning urine. (2) Faulty test — use a fresh kit from a different batch. (3) Symptoms are PMS-related. If your period is more than 5 days late and tests remain negative, visit your doctor for a blood test (β-hCG), which can detect pregnancy from as early as 8–10 DPO.

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Now you know your best test date — order a certified pregnancy kit for same-day or next-day delivery.

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Prega News First Response Clearblue i-Can

Pregnancy Test Calculator by LMP Date — When to Test

📅 Pregnancy Test Date Calculator 2026

📊 Your Cycle Timeline

How to Use the LMP Pregnancy Test Calculator

Enter Your LMP Date

Set Your Cycle Length

Set Luteal Phase (Optional)

Get Instant Results

Pregnancy Test Accuracy by Days Past Ovulation (DPO)

Pregnancy Test Accuracy by Brand and DPO

Pregnancy Test Calculator — Frequently Asked Questions

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Get 99% Accurate Results — Order a Real Test Kit

Pregnancy Test Calculator
by LMP Date — When to Test