Just by these 3 words alone, it means "I'll have to" (do something). In this case, the 得 is read as "dei" instead of "de".
Example sentence: 你要走啦?那我也得赶收拾了/ Ni3 Yao4 Zou3 La4? Na4 Wo3 Ye2 Dei3 Gan2 Jin3 Shou1 Shi4 Le4/ You're going off already? Then I'll have to hurry and pack up too.