よく分かるよ

I understand very well

→ 良く
phrase Uncommon #17,987
I understand very well A casual, reassuring way to say you understand. The final よ adds emphasis.
JA: その気持ち、よく分かるよ。
EN: I completely understand how you feel.

君がこの場所をとても気に入ってる訳が、よく分かるよ。

I can really see why you like this place so much.

トムがメアリーを好きな訳が、俺にはよく分かるよ。

I can totally understand why Tom likes Mary.

よく分かるよ

I understand very well.

— 海の上のピアニスト (1998)

行きたくない理由、よく分かるよ。

I completely understand why you don't want to go.

トムを好きじゃない理由、よく分かるよ。

I totally understand why you don't like Tom.

気持ちはよく分かるよ。

I know exactly how you feel.

すごくよく分かるよ

I totally understand.

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)