Translation App suggestion – Kanji/Katakana/Hiragana to Romanji

I enjoy traveling to Japan and have rudimentary Nihongo skills. While walking around Tokyo, I see a lot of restaurants posting their menu.

I use google translate a lot to take a picture of the menu and it does a great job translating to English, but I'm looking for an app (android) that will translate to Romanji.

when I see a menu item like サバ 定食 , I don't want to order the "Mackerel Set Meal" I would like to order "saba teishoku".

I understand enough Japanese to know what a saba teishoku and I'm familiar with the different foods, but I get lost when they start using a lot of kanji and I want to order in Japanese.

Any suggestions? I tried Yomiwa, but that only does one character at a time. As mentioned, google translate does great into English.

by cheluhu