Thinking or feeling something with

Grammar: Conjecture » 〜気がする

気(き)がする following a word or phrase ending with a verb, adjective, or noun, has the meaning of “I feel that ~” (「〜と感(かん)じる」) or “I think that ~” (「〜と思(おも)う」).

「〜と思(おも)う」 states a thought more directly. 「〜気(き)がする」 is closer to 「たぶん〜と思う」, “I think perhaps ~”.

To express conjecture (推量(すいりょう)), feeling (感覚(かんかく)), or impression (印象(いんしょう)), ような may be used. In this case, the meaning does not change.

Usage Notes

気(き)がする presents an impression based on a vague feeling rather than a firm claim.

It appears after a full clause with ような, as in 〜ような気(き)がする. That wording makes the statement softer than saying 〜と思(おも)う.

Further Reading

Examples

Feeling running is better after all with 〜気がする

Manga panel from あしたは土曜日 showing example of Feeling running is better after all with 〜気がする.
あしたは土曜日 » Volume 秋・冬 » Page 56

Mina proclaims she knows a shocking fact about being caught in the rain: it doesn’t matter whether you walk or run because you’ll get wet the same amount either way. Sanae says she heard running it better to avoid getting as wet. Mina says if it starts raining, she’ll walk, and Sanae has to run.

サナエ:
「歩(ある)くんじゃなかったの?」
“Weren't you going to walk?”
ミナ:
「やっぱ走(はし)った方(ほう)が濡(ぬ)れない気(き)がするーーー」
“Sure enough, I feel running's better to not get wet!”

Feeling you've gained weight with 〜気がする

Manga panel from ふらいんぐうぃっち showing example of Feeling you've gained weight with 〜気がする.
ふらいんぐうぃっち » Volume 2 » Page 136

Nao sees Makoto’s cat, Chito. She stops to pet the cat when she notices something.

なお:
「もしかして太(ふと)ったぁ?前(まえ)より一(ひと)回(まわ)り大(おお)きくなった気(き)がするねー」
“Could it be you've gotten fatter? I feel you've grown a size bigger than before.”

Thinking it cost more with 〜気がする

Manga panel from orange showing example of Thinking it cost more with 〜気がする.
orange » Volume 2 » Page 22

As thanks for Naho making him lunches, Kakeru gives her a jewel-encrusted hair clip. In her room later, Naho looks over the piece.

菜穂(なほ):
「絶対(ぜったい)お弁当代(べんとうだい)より高(たか)い気(き)がする」
“I think it definitely cost more than lunch.”