からすると details
judging from N; going by N — N taken as the evidence or the vantage
あの慌てぶりからすると、何か忘れたんだろうね。
ano awateburi kara suru to, nanika wasureta n darou ne.
Judging by how flustered he looks, he must have forgotten something. casual
外国人から見ると、日本の満員電車はちょっと異常だよね。
gaikokujin kara miru to, nihon no man'in densha wa chotto ijou da yo ne.
Seen from a foreigner's side, Japan's packed trains are kind of insane. casual
- formal
- alternant
- colloquial
- alternant
Examples
judging from N — the noun is evidence the speaker infers a conclusion from, and the tail is a conjecture
あの慌てぶりからすると、何か忘れたんだろうね。
ano awateburi kara suru to, nanika wasureta n darou ne.
Judging by how flustered he looks, he must have forgotten something. casual
この売り上げの伸び方からすると、今年は目標を超えそうだ。
kono uriage no nobikata kara suru to, kotoshi wa mokuhyou o koesou da.
Going by how sales are climbing, we look set to beat this year's target. neutral
現在のデータからすれば、来期の需要は縮小するものと見込まれます。
genzai no deeta kara sureba, raiki no juyou wa shukushou suru mono to mikomaremasu.
On the current data, demand next term is expected to contract. formal
from N's side of it — the noun is a party whose vantage the speaker steps into
外国人から見ると、日本の満員電車はちょっと異常だよね。
gaikokujin kara miru to, nihon no man'in densha wa chotto ijou da yo ne.
Seen from a foreigner's side, Japan's packed trains are kind of insane. casual
親からすると、子供の一人暮らしはやはり心配です。
oya kara suru to, kodomo no hitorigurashi wa yahari shinpai desu.
From a parent's side of things, a child living alone is worrying after all. neutral
Formation
{N}からするとattaches to noun
Variant notes
- からすれば — the ば conditional in place of と — more written, and the form that dominates in analysis and reportage.
- から見ると — 見る for する makes the ground something looked at rather than reasoned over, at the same register in speech and writing — the member that sits most naturally with a person as the vantage (子供から見ると, 外国人から見ると).
- から見て — the clipped て-form, common in speech — states the inference as following directly, without the と conditional's "if you go by this" framing.
- からして — the same evidential frame at the same register, at home in written argument as much as in speech, but this surface alone also carries an independent reading the と／ば forms never have — 態度からして気に入らない "take his attitude for a start, and the rest is worse".
Related patterns
Similar
によると relays a claim someone else MADE and resolves in a hearsay tail (天気予報によると降るそうだ); からすると takes its noun as raw evidence the SPEAKER reasons over and resolves in the speaker's own conjecture (空模様からすると降りそうだ) — によると never marks evidence to be interpreted, and からすると never marks an utterance being quoted.
The two take different nouns — からいうと takes the ANGLE a verdict is delivered from (結論から言えば, 値段から言えば) and its tail is the speaker's own evaluation, while からすると takes the EVIDENCE an inference rests on (この様子からすると, あの口ぶりからすると) and its tail normally carries a conjectural marker; the idiom 結論から言うと "to state the conclusion first" has no からすると twin, since 結論からすると can only mean "judging from the conclusion someone reached".
Both can take a person and step into their vantage, but からすると also reads its noun as EVIDENCE (この数字からすると "going by these figures") — a reading にしたら simply has not got; 数字にしたら parses only as にする＋たら, "if you turn it into a number".
からすると takes a bare NOUN and is happy with abstract evidence the speaker never witnessed (統計からすると); ところを見ると takes a whole CLAUSE, and that clause has to report something observed on the spot (電気が消えているところを見ると) — ×統計ところを見ると has no frame to sit in, and からすると can only reach a clause via 〜ことからすると.
Lookalikes
One morpheme apart (と／から) with the same する conditional, and both gloss "if we go by this" — but としたら builds a supposition the speaker need not believe and takes a whole clause (雨が降るとしたら), while からすると takes a bare noun it treats as established fact (この雲からすると); としたら cannot host an evidence noun, and からすると cannot mark a hypothesis.