Pregnancy Test Calculator

on Jul 04, 2012

by Lucy Eades

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The ultimate test question - when do I take a pregnancy test? For us pee-on-a-stick (POAS) addicts, we need to know because we want to pee on a stick a lot.

The ultimate test question-when do we take a pregnancy test? Now some of us that are new to the trying to conceive world are just kind of like-seriously, when do I take a test? I have no idea. And then some of us other pee-on-a-stick (POAS) addicts like myself just get a little antsy and we want to pee on a stick a lot. We want to know the moment we can find out if we’re pregnant or not, and we likely do not want to wait until we have a missed period! And pregnancy tests are not always cheap so if y’all like saving money, like myself and you’re a pee-on-a-stick addict-it’s a hard equation to figure out if, it really is. Claim Your 20 Free Pregnancy Tests – Click Here

Having a pregnancy test calculator can really ease the confusion or just kind of put things in perspective for you, so you know when you can take a pregnancy test & expect the HCG levels to be high enough to show a possible pregnancy. No sense in wasting good pregnancy tests if it’s too early to test.

Step #1 – Calculate cycle day 1

Now, in order to use a pregnancy test calculator there are only a few things you need to know and the first one is when did you start your period. This will be Cycle Day 1, the first day of your period.

Step #2 – Calculate your cycle length

Next you will need to know your average cycle length, and what that means is how long until your next period starts. Do you usually have a period every 28 days, which is the average, or do you have slightly longer cycles that run 32 or 34 days. So from day one of your period starting up until when your next cycle starts, this will determine your average cycle length. It will typically be between 28 to 32 days for most women, but some women have shorter cycles and some have far longer. Every woman is different.

Step #3 – Calculate the day you ovulated

Now number three is a bonus, an optional point to know. It’s not a necessity that if you happen to know what day you ovulated on or close to in general what day you typically ovulated on, it is a bonus. It will more than likely give you a more accurate result for when to take your pregnancy test, because pregnancy tests are based on the number of days past ovulation (DPO) that you are. If you know the day you ovulated by taking an ovulation predictor kit (OPK) or by charting your temperatures, that will make the calculator results more accurate for you. But don’t fret. If you don’t know the exact day you ovulated, then the calculator will take the average of your cycle length. So if you have an average cycle length of 28 days, it will assume you ovulated on day 14.

Step #4 – Calculate your luteal phase length

Now the next question. What is your luteal phase length? This is an optional question, as the average woman’s luteal phase is 14 days. The luteal phase is from the time you ovulated to the start of your next cycle. Since you ovulate roughly mid-way through your cycle length, and if you have a 28 day cycle, that would mean you would ovulate on day 14. So with a 28 day cycle, 28-14 = 14 days for your luteal phase length. Again, this is only if you know your personal luteal phase length. You can leave this one at the average of 14.

Where can I find one?

Where can you find a pregnancy test calculator? Go ahead and enter in your information above, and find out when you can begin testing. It’s pretty easy. All you have to do is plug in your information, click enter and then you get results. And voila, you know exactly when you can test and expect to find a positive result if you are indeed testing. No sense testing too early, getting a possible false negative, when in fact you are pregnant & it’s just too early to test.

An example result

Okay, so let me give you an example. When I did the pregnancy test calculator, I plugged in June 3, that is when my last cycle started and my average cycle length is 31 days, and my LP which is my luteal phase is sixteen days. I didn’t know exactly when I ovulated, so I just clicked ‘Not sure when I ovulated.’ My results showed that the very best day to test is July 4, with a testing window from July 1-6. Before July 1, it shows that it’s too early to test. And if I did test then, I might end up with a negative that could become positive as the HCG levels rise and more days pass. So it’s best to wait until just the right time to test, to make sure you’re getting just the right result!

So until next time ladies, I will see you all later, bye!

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Pregnancy Test Calculator, 3.3 out of 5 based on 45 ratings

Lucy is a mother of three, who’s passionate about all things AP parenting. When she’s not busy giving tips on keeping babies healthy & happy, you can find her blogging on her popular YouTube channel

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  • Ava

    Has anyone ever gotten an answer from this sight?

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  • Mariam

    I’ve had sex on the 29 of June my last period started on the 24 of June
    9th July I had implant bleeding when can I take a pregnancy test what does this mean am I pregnant ???

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  • Chassity Rose

    My period hasn’t came on in like months. Maybe 4 to 6 months and i’m scared that i might be pregnant. I’m too young to be pregnant. I was pressured into having sex. Somebody Pleaseee Help Mee!!!!!!

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  • Meg

    My period is a week late. I tested when I was 6 days late and according to the above calculator, I tested on the correct day. The test was negative. I’m having the soreness and fatigue, but the test was negative. I used the store brand, early detection, test. My husband and I have been trying for 4 months with a ‘if it happens it happens’ attitude. I’m scarred. I made the mistake of googling other reasons for missed af and negative tests. Do you have any advice?

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  • Meg

    Actually, I tested the 28th. A full week past the suggested date.

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  • Courtney

    I have had the nextopline I believe its called that well I got it almost 2 years ago recently took it out tried birth control pills stopped taking them into a week of that my periods usually starts the 2-3 week if every month but no period this month although i did encounter small spotting once when I wiped I took test but all negative could I be pregnant and its too early to tell when should I retest?

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  • JoJo

    Regular 27 day cycle; may 30, june 26 and july 23rd. was due on 19th had intercourse 5 & 6 and some of 7th lol. took pregnancy test on Saturday-BFN. should I test again. no sign of AF. But tender breasts and cramping.

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  • Nneka

    My period is one (1) day late. I took the home test on 25/08/2016 but it came out negative. My last period came on 27/07/2016. What could be the problem?

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  • Gigi

    My last period was August 15 2016 , I have had bad nausea and wake up with nausea and have bloating and mild cramps. My next period isn’t until the 16th next mo. Also when I eat the nauseated feeling subsides . I want to know if I’m pregnant so when could I test for it? It would be my first baby. I’m on no medicine of any kind

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  • Tonia Storm

    The past two months my periods been two days me n my fiance have been trying since we miss carried feb 15th this yr i normallg get my period every 15th of the month i just started spotting little today and i am still not due for another 7 days can i be pregnant

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  • Maria

    So I got my period September 5th and then I got it again September 24th and I was wondering if I could be pregnant because at first it was really light and then came out really heavy can could be possible that I’m pregnan.

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  • Kathrine Eaves

    Am I pregnant feeling sick nauseous missed period but negative hot?

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  • AddictedToPeeingOnAStick

    Help !!!! I did the baby dance with my bf 09/20/16 && I had my lmp 09-25-2016 and ended 09-30-16 && we did the baby dance on 10/01/16. I had some spotting (first time ever I have two boys already) I spot 10-12,13 & 14th/ 2016…. could I be pregnant I haven’t had any symptoms but on and off light cramps.

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