GRAMMAR DETAIL
～以内
Sets an inclusive upper bound for an amount or period.
Examples
申し込みは三日以内に済ませてください。
Please complete the application within three days.
Words used
荷物の重さは二十キロ以内にしてください。
Please keep your luggage within the twenty-kilogram limit.
Words used
Study notes
1. Origins, structure, and basic meaning
- Structure: Add
以内（いない）to a quantity or period to set a range within and including the limit. - Basic usage:
荷物の重さは二十キロ以内にしてください。asks that the luggage weigh no more than twenty kilograms.
2. Common pitfalls and similar expressions
- Including the boundary
二十キロ以内includes exactly twenty kilograms.二十キロ未満excludes the boundary value itself.
- A deadline and a duration
三日以内に出すgives a deadline of submitting within three days, while三日以下の旅行limits the trip's duration to at most three days. Distinguish a completion deadline with以内にfrom the length of a period.