Pregnancy Test Calculator
by LMP Date โ 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.
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.
๐ Pregnancy Test Date Calculator 2026
Enter your LMP date ยท Adjust cycle length for irregular periods ยท Get instant dates
Already have a test strip? Use our Test Line Scanner โ
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 โ 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 21โ45 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 10โ16 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.
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.
Very early. hCG just beginning to rise. Only the most sensitive tests (6 mIU/mL) may detect. High false-negative risk.
Early test possible. First Response (6.5 mIU/mL) can detect at this stage. Still significant false-negative risk.
Good accuracy range. Most early-response tests (20 mIU/mL) will detect pregnancy here if implantation has occurred.
Best accuracy. Day of missed period. Standard pharmacy tests (25 mIU/mL) are 99% accurate. Test with first morning urine.
Source: NIH โ hCG Detection in Early Pregnancy | Mayo Clinic โ Home Pregnancy Tests
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 | 10โ11 DPO | 99% |
| Clearblue Early Detection | 10 mIU/mL | 11โ12 DPO | 99% |
| Standard Strip Test | 20โ25 mIU/mL | 12โ14 DPO | 99% |
| Prega News (India) | 20 mIU/mL | 12โ14 DPO | 99% |
| i-Can (India) | 25 mIU/mL | 14 DPO | 99% |
| Blood Test (Quantitative ฮฒ-hCG) | 1โ2 mIU/mL | 8โ10 DPO | 99.9% |
| Online Quiz / Symptom Checker | Symptom-based only | Any time | 60โ80% |
Source: Clearblue | NHS Pregnancy | WebMD
Pregnancy Test Calculator โ Frequently Asked Questions
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