How effective is the birth control pill without using a condom too?

How effective is it if you don't miss it any days, but if a few times you have forgotten to take it at the same time of day? With no condom as well.

The Pill is 92-99.7% effective as birth control. It does not protect against reproductive tract infections, including HIV/AIDS.

Missed Pills: Late Start

The most common way women get pregnant while using The Pill is starting late.

1 day late starting the next package: Take 2 pills as soon as you remember and one pill each day after. Use a backup form of birth control for two weeks.
2 days late starting the next package: Take 2 pills per day for 2 days, then continue as usual. Use a backup form of birth control for two weeks.
3 or more days late starting the next package: Call the clinic for instructions.
Missed Pills: During the Cycle

1 pill missed: Take it as soon as you remember and take your next pill at your usual time. This may mean taking two pills in one day.
2 pills missed in a row in the first two weeks: Take two pills on the day you remember and two pills the next day. Finish the rest of the pack as usual. Use a backup form of birth control for one week.
2 pills missed in a row in the third week: Keep taking one pill every day until Sunday. On Sunday, set aside the rest of the pack, including the spacers, and start taking a new pack of pills. Use a backup form of birth control for one week.
3 or more pills missed in a row anytime: Keep taking one pill every day until Sunday. On Sunday, set aside the rest of the pack and start taking a new pack of pills. Use a backup form of birth control for two weeks.
Missing any of the last 7 pills of a 28-day package will not raise your risk of pregnancy. Skip the pills you missed, but be sure you start your next pack on time.

You should always use a back up plan (i.e. CONDOM) just in case

I know that everyone else gave you statistics, but I can tell you from my own experience that if you really don't want to get pregnant you should use another form of birth control. I was on the pill for almost a year and never missed one and took it at the same time everyday, yet here I am 22 weeks pregnant. In my case if worked out because we were planning on having one soon anyways, but if you don't want a kid right now use a backup method.

For preventing pregnancy, if you never miss a pill it's over 99% effective. (Meaning less than one pregnancy per year per 100 women who take it.)

For preventing STDs, it isn't effective at all.

You should use a condom if you have been on the pill less than 3 months...or if you skip taking the pill. The pill is effective if you take it regularly, the more you miss the less effective.

It depends on the actual pill, but its normally around 99% effective.

if you dont miss any days around 98-99%