Grammar Rule in 30 Seconds
Always write 'up to' as two separate words; 'upto' is a common spelling error that should be avoided in formal English.
- Use 'up to' for limits: 'Up to 50 people can attend.'
- Use 'up to' for responsibility: 'It is up to you to decide.'
- Avoid 'upto' entirely in professional writing: 'The price is up to (not upto) $10.'
Overview
maybe と may be、everyday と every day などがその代表例です。今回取り上げる up to も、その一つかもしれません。結論から言うと、現代の標準的な英語において正しいのは、常に2語で書く up to です。upto と1語で書くのは、事実上のスペルミス（綴り間違い）と見なされます。up（副詞的要素）と to（前置詞）という2つの単語の組み合わせで表現されます。この up to は「句前置詞（phrasal preposition）」と呼ばれ、複数の単語が集まって一つの前置詞のような働きをします。日本語の感覚で言うと、「～に至るまで」や「～のところまで」のように、いくつかの言葉が組み合わさって一つの意味を作っている状態に近いと考えてください。upto と繋げて書いてしまう人がいるのでしょうか。それは、発音する際に up と to が一気に、あたかも1語のように発音される（/əptu/）ためです。しかし、ビジネス文書や学術的なレポート、あるいは公式なメールなどで upto と書いてしまうと、「細かい部分に注意が払えない人」という印象を与えかねません。この記事では、この重要かつ多機能な up to の使い方を、日本語との違いを交えながら徹底的に解説します。up to の本質的なイメージは、「ある地点や限界に向かって近づき、そこに到達するが、それを超えない」というものです。このイメージを理解するために、構成要素を分解してみましょう。up: ここでは「上へ」という方向だけでなく、「ある基準に達する」「完了する」「近づく」といったニュアンスを含みます。to: 到達点や限界、目的地を示す前置詞です。
to）よりも、「徐々に近づいていって、ついにその限界点に達した」というニュアンスが強まります。日本語の「～まで」は非常に守備範囲が広い言葉ですが、英語の up to は主に以下の5つの役割を担います。The elevator can hold up to 10 people.（このエレベーターは最大で10人まで乗れます。）You can save up to 50% during the sale.（セール期間中は最大50%まで安くなります。）
I walked up to the front door.（私は玄関のドアのところまで歩いて行った。）The water came up to my knees.（水が膝の高さまで来た。）
It’s up to you to decide where we eat.（どこで食べるかは君次第だ／君が決めることだ。）The final choice is up to the committee.（最終的な選択は委員会に委ねられている。）
What have you been up to lately?（最近は何をしていたの？／どう過ごしてた？）I think those kids are up to no good.（あの子たちは何か悪いことを企んでいると思う。）
I don't feel up to going for a run today.（今日はランニングに行く気分（元気）ではない。）Is he up to the task?（彼はその仕事に耐えうる（こなせる）だろうか？）
up to の形自体は、主語が三人称単数になっても、時制が変わっても変化しません。変化するのはその周囲の動詞や代名詞です。日本語の助詞「～まで」が形を変えないのと似ていますね。数量/程度 + up to + [数値・名詞句] | Prices are up to 30% lower online.（オンラインでは価格が最大30%安くなります。） |[移動動詞] + up to + [場所] | He ran up to me and asked for directions.（彼は私のところまで走ってきて道を尋ねた。） |It is up to + [人] (+ to do) | It's up to us to finish the project.（プロジェクトを終わらせるのは私たちの責任だ。） |What + be + [主語] + up to? | What are you up to this weekend?（今週末は何をする予定？） |be (not) + up to + [名詞/動名詞] | I'm not really up to a long meeting.（長い会議に耐えられる状態ではありません。） |- 「責任」を意味する
It's up to youのパターンでは、形式主語のItがよく使われます。 - 「体調・能力」を意味する場合は、否定文で使われることが非常に多いです（
not up to it）。
up to はフォーマルからカジュアルまで、あらゆるシーンで登場します。日本語の「～まで」をそのまま until や to に置き換えるのではなく、状況に応じて up to を選べるようになると、英語がぐっと自然になります。to を使うよりも、up to を使うことで「この数値を超えない範囲で」というニュアンスが明確になります。We can offer a discount of up to 15%.（最大15%までの割引を提供できます。）The test can take up to two hours.（テストには最大2時間を要する場合があります。）
Up to 70% off となります。これは「全ての商品の割引率」ではなく「最も高い割引率」を指すため、消費者としての理解にも役立ちます。Up to 50% off all winter items!（冬物全品、最大50%オフ！）
How are you? も良いですが、What have you been up to? と聞くと、より「具体的にどんな活動をしていたの？」という親近感のある響きになります。A: Hey! Long time no see. What have you been up to?（やあ！久しぶり。最近何してた？）B: Not much, just working a lot.（別にそんなに。ただ仕事ばっかりしてたよ。）
The final layout is up to you, Ken.（最終的なレイアウトは、ケン、君に任せるよ。）Whether we launch today or tomorrow is up to the manager.（今日ローンチするか明日するかは、マネージャー次第です。）
upto と書いてしまうinto や onto のように1語になる前置詞がある一方で、up to や next to、according to のように2語で機能するものが多くあります。「up to は常にスペースを入れる」と指に覚え込ませましょう。until との混同- 間違い:
The room can hold until 100 people. - 正解:
The room can hold up to 100 people.
until は「ある状態がずっと続いている時間」に焦点を当てます。一方、up to は「上限・限界」に焦点を当てます。数値を伴う上限には up to を使いましょう。up for との取り違えWhat are you up to?: 「何をしているの？（現在の活動）」What are you up for?: 「何がしたい？（何に乗り気？）」
Are you up to a movie? と言うと、「映画を観るだけの体力や能力があるか？」という少し変なニュアンスになってしまいます。誘うときは Are you up for a movie?（映画に行く気ある？）が正解です。up to と似た意味を持つ他の表現と比較してみましょう。これらを使い分けられると、表現の幅が広がります。Up to 20 people.（最大20人まで） |As far as I know...（私の知る限りでは…） |I waited until 5 PM.（5時までずっと待った。） |up to よりも客観的。 | Depending on the weather...（天候次第で…） |The maximum capacity is 50.（最大収容人数は50です。） |It's up to you.（君次第だ）は、相手の「意思」に焦点を当てています。It depends on you.（君次第だ）は、相手の「状況や条件」に焦点を当てています。
up to you ですが、君が来るかどうかで結果が変わるなら depends on you が自然です。upto という綴りをネットで見かけましたが、本当に間違いですか？up to と2語で書きましょう。Up to now と Until now は同じですか？Until now は「今まではそうだった（が、これからは違う）」という変化を強調することが多いです。一方、Up to now は「今に至るまで（ずっとこうだ）」という継続性を強調する傾向があります。What are you up to? と聞かれたら、どう答えればいいですか？What are you doing? と同じ意味なので、今していることや最近の出来事を答えます。特に何もしていなければ Not much.（別に何も）や Just relaxing.（リラックスしてるよ）と答えればOKです。up to の後に動詞を置くときは -ing 形ですか？up to の to は前置詞なので、基本的には名詞か動名詞（-ing）が来ます。例：I'm not up to going out.It's up to you to decide. のように、up to you の後に「何が」任されているかを説明する不定詞（to + 動詞の原形）が続く形も非常に一般的です。この場合、2つの to が並ぶことになりますが、文法的に正しい構造です。The Anatomy of 'Up To'
| Component 1 | Component 2 | Result | Status |
|---|---|---|---|
|
Up (Adverb)
|
To (Preposition)
|
Up to
|
Correct ✅
|
|
Up
|
To
|
Upto
|
Incorrect ❌
|
Meanings
A multi-word preposition used to indicate a maximum limit, a physical movement toward a point, or a person's responsibility.
Maximum Limit
Indicating the highest amount, degree, or number possible.
“You can save up to 70% during the summer sale.”
“The temperature will rise up to 30 degrees today.”
Responsibility or Choice
Indicating that someone has the power or duty to make a decision.
“It's up to the manager to approve your leave.”
“Whether we go or stay is up to you.”
Current Activity
Asking or stating what someone is doing at the moment.
“What have you been up to lately?”
“I think those kids are up to no good.”
Physical Approach
Moving toward a specific point or person.
“She walked right up to the front door.”
“He came up to me and asked for the time.”
Reference Table
| 形 | 状態 | 意味 | 例文 |
|---|---|---|---|
|
`up to`
|
正しい
|
上限や最大値を示す
|
The discount is `up to` 30%.
|
|
`up to`
|
正しい
|
責任や選択を示す
|
It's `up to` you to decide.
|
|
`up to`
|
正しい
|
活動の内容を説明・質問する
|
What have you been `up to`?
|
|
`up to`
|
正しい
|
物理的な地点や目的地を示す
|
He walked `up to` the edge of the cliff.
|
|
`upto`
|
間違い / 非標準
|
`up to` のよくあるスペルミス
|
~~I can spend `upto` $20.~~
|
|
`upto`
|
間違い / 非標準
|
フォーマルな場では使用不可
|
~~The decision is `upto` the committee.~~
|
フォーマル度スペクトル
The auditorium accommodates up to five hundred individuals. (Event planning)
The room holds up to 500 people. (Event planning)
You can fit up to 500 people in here. (Event planning)
Can cram up to 500 heads in this spot. (Event planning)
up to vs. upto
「up to」の3つのお仕事
意味：上限
- up to 10 people 最大人数
- up to $100 最大金額
- up to the end 最後まで
意味：責任
- It's up to me 私の決定
- It's up to them 彼らの義務
意味：活動
- What are you up to? 何してるの？
- He's up to no good. 悪巧みをしている
「up to」か「upto」か迷ったら？
現代の英語を書いていますか？
文脈別の「up to」
数字
- • up to 50%
- • up to 10 guests
- • up to grade 5
責任
- • It's up to you
- • up to the manager
- • up to us
活動
- • What are you up to?
- • up to no good
- • up to something
場所・時間
- • walked up to the line
- • up to now
- • up to the last minute
レベル別の例文
I can count up to ten.
I can count up to ten.
The bus goes up to the park.
The bus goes up to the park.
He has up to three cats.
He has up to three cats.
It is up to you.
It is up to you.
What are you up to today?
What are you up to today?
The water is up to my waist.
The water is up to my waist.
You can have up to two cookies.
You can have up to two cookies.
I am not up to much this weekend.
I am not up to much this weekend.
The hotel can accommodate up to 200 guests.
The hotel can accommodate up to 200 guests.
It’s up to the committee to decide the winner.
It’s up to the committee to decide the winner.
I’ve been so busy; I’m not up to date with the news.
I’ve been so busy; I’m not up to date with the news.
The car can reach speeds of up to 120 mph.
The car can reach speeds of up to 120 mph.
The project is up to the standard we expected.
The project is up to the standard we expected.
He looks like he’s up to no good with that ladder.
He looks like he’s up to no good with that ladder.
Up to now, we have seen no evidence of fraud.
Up to now, we have seen no evidence of fraud.
I don't feel up to going out tonight; I'm exhausted.
I don't feel up to going out tonight; I'm exhausted.
The decision is entirely up to your discretion.
The decision is entirely up to your discretion.
The athlete isn't quite up to par after his injury.
The athlete isn't quite up to par after his injury.
We can offer a discount of up to, but not exceeding, 15%.
We can offer a discount of up to, but not exceeding, 15%.
She walked up to the podium with immense confidence.
She walked up to the podium with immense confidence.
Whether the theory holds water is up to empirical verification.
Whether the theory holds water is up to empirical verification.
The legacy of the dynasty was up to the whims of the final heir.
The legacy of the dynasty was up to the whims of the final heir.
He was up to his ears in debt before the business took off.
He was up to his ears in debt before the business took off.
Up to this point, the narrative has been strictly linear.
Up to this point, the narrative has been strictly linear.
間違えやすい
Learners think that because 'into' is one word, 'upto' should be too.
Both indicate a limit, but 'until' is only for time.
Both are used for maximums.
よくある間違い
I can run upto the tree.
I can run up to the tree.
It is upto you.
It is up to you.
The sale is upto 50% off.
The sale is up to 50% off.
He is not upto the task.
He is not up to the task.
文型パターン
It is up to ___ to ___.
I can ___ up to ___.
What have you been up to ___?
The ___ is not up to ___.
Real World Usage
Get up to 40% off on all electronics this Black Friday!
Hey! What are you up to? Want to grab coffee?
I am looking for a role where the success of the team is up to me.
Drive up to the gate and press the buzzer.
Delivery in up to 30 minutes.
The tenant is liable for damages up to the amount of the deposit.
2つの単語、3つの意味
up to は常に2単語で覚えよう。上限、責任、活動の3つをカバーできるよ。 I can spend up to $50.
「Upto」の罠に注意
The limit is up to $100.
「検索と置換」を活用しよう
upto を探してみて。もし見つかったら、すぐに正しい up to に直そう。 Check up to the last page.
挨拶としての使い方
What are you up to?は挨拶として超定番。
How are you? と同じ感覚で使ってみて。 Hey, what are you up to?
Smart Tips
Don't ignore it! Just add a space. Your computer is right—'upto' isn't a standard word.
If it comes before a noun, use hyphens. If it comes after, don't.
Use 'What are you up to?' instead of 'What are you doing?' to sound more like a native speaker.
Use 'up to' for a neutral fact, and 'as many as' if you want to sound impressed.
発音
Stress Pattern
In the phrase 'up to', the stress usually falls on 'up'.
Rising on 'up'
What are you UP to? ↗️
Conveys friendly curiosity.
暗記しよう
記憶術
Up and To are like two friends: they like to hang out together, but they always need their personal space.
視覚的連想
Imagine a ruler. There is a clear gap between every inch. If you squash the numbers together, you can't read the limit. Keep the gap in 'up to' to keep the limit clear.
Rhyme
If you want your writing to be true, keep a space between the two.
Story
A shopkeeper was writing a sign for a sale. He wrote 'UPTO 50% OFF'. A customer walked in and asked, 'What is an Upto?' The shopkeeper realized his mistake, took a pair of scissors, and cut the word in half. Now everyone knew the limit was 'Up to' 50%.
Word Web
チャレンジ
Look at three different online shopping websites. Find how many times they use 'up to' for discounts. Check if any of them make the mistake of writing 'upto'.
文化メモ
In the UK, 'up to' is strictly two words. Using 'upto' is often seen as a sign of poor education.
In India, 'upto' is frequently used as a single word in newspapers and government forms. While common there, it is still avoided in international exams.
US advertisements use 'UP TO' in giant letters to highlight big savings, often hiding the fact that most items have smaller discounts.
The phrase combines the Old English 'up' (higher) and 'to' (direction).
会話のきっかけ
What are you up to this weekend?
How much are you willing to spend on a new pair of shoes?
If you could invite up to three famous people to dinner, who would they be?
Do you think it's up to the individual or the government to protect the environment?
日記のテーマ
よくある間違い
Test Yourself
The meeting will last for ___ two hours.
up to です。 upto はスペルミスです。正しい文を選んでください：
up to を使うのが正解です。Find and fix the mistake:
It is upto the customer to read the terms and conditions.
up to です。1単語の upto は間違いです。Score: /3
練習問題
8 exercisesThe elevator can hold ___ 10 people.
It is ___ the teacher to decide the homework.
Find and fix the mistake:
I have been upto a lot of work lately.
you / what / up / are / to / ?
1. Up to 50% off. 2. It's up to you. 3. What are you up to?
Translate: 'El restaurante tiene espacio para hasta 20 personas.'
Pick the correct sentence:
Your work is not quite up to ___.
Score: /8
Practice Bank
13 exercisesHey, what have you been ___ lately?
This jacket is available in sizes ___ XXL.
正しい文を選んでください：
正しい文を選んでください：
My phone's battery can last for upto two days.
I saw the kids and they were clearly up too no good.
単語を並べ替えて文を作ってください：
単語を並べ替えて文を作ってください：
英語に訳してください：'その男の子はドアのところまで歩いていった。'
英語に訳してください：'最近何をしていたの？'
文のパーツを組み合わせてください：
The historical document dates from a time when `upto` was sometimes used, but it's not ___ in modern English.
The police officer pulled up to the car and looked inside.
Score: /13
よくある質問 (8)
In standard British and American English, no. However, you may see it in Indian English or in computer programming (like the Ruby language), but you should avoid it in general writing.
Language evolution is often inconsistent. 'Into' and 'onto' merged because they created a new, specific meaning. 'Up to' has remained two words historically, and grammarians have kept it that way.
Yes, as in `up to an hour`. However, `until` is more common for specific points in time like `until 5 PM`.
It is an idiom meaning someone is planning to do something bad or mischievous.
Yes! When 'up to date' is used as an adjective before a noun (e.g., `an up-to-date report`), it uses hyphens. Otherwise, it doesn't.
You can say `Not much`, `Just working`, or `I'm just about to head out`. It's a very flexible greeting.
Yes, in a physical sense. `I walked up to the edge` means the same as `I walked as far as the edge`.
Absolutely, as long as you write it as two words. It is the standard way to express limits in business.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
hasta
English distinguishes between time (until) and quantity/distance (up to).
jusqu'à
English never uses an apostrophe or hyphen for 'up to'.
bis zu
German grammar is very similar here, making it easier for German speakers to remember the space.
まで (made)
Word order is reversed, and there is no space issue in Japanese.
حتى (hatta)
Arabic speakers must learn to separate the concepts of time and limit.
高达 (gāodá) / 至多 (zhìduō)
Chinese focuses on the action of reaching a limit rather than the prepositional relationship.
Learning Path
Prerequisites
関連動画
18:21 Star Wars: Episode I - The Phantom Menace - Movie Review
00:56 Draco Malfoy Introduces Himself To Harry | Harry Potter and the Philosopher's Stone
05:16 THE WORLD IS NOT ENOUGH | Opening Scene – Pierce Brosnan | James Bond
「Up to you」だけじゃない！up toの意外な使い方5選
Hapa 英会話
ネイティブが毎日使う 'What are you up to?' の意味と返し方
AK-English
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