Yeast starter viable?

Just made my first yeast starter last night. Went well. 1L starter with wlp300 for a 4 gallon batch. This morning it had a small foamy krausen probably a 3mm thick.

When I used "mr malty" and other yeast calculators it says I need a 2L starter and a stir plate. My yeast is almost a month away from its expiration date so that's the reason it says that I won't have enough cells. If this information is really that accurate, can i reinforce or completely switch the starter with dry fermentis Hefeweizen yeast, that's all I have access to?
The yeast starter will have been sitting for 24 hours when I pitch it

 

Pitch it, you'll be fine and make great beer.

Make sure you have your Mr Malty setting on Intermittent Shaking

 

It will be viable, but vitality won't be as high as it could be.

 

thanks guys!! about to pitch right now

it had a pretty good krausen so i think i am safe!

 

You're good- an underpitch is not nearly as big of a deal on a hefeweizen, it can even up the yeast flavor in some situations.