営業日計算機
無料の営業日計算機。2つの任意の日付間の営業日(月~金)を、週末を除いて数えます。プロジェクトのタイムライン、休暇計画に。
Runs in your browserUpdated Apr 26, 2026
Working days calculator
よくある質問
›Are public holidays excluded?
Currently we only exclude weekends (Sat/Sun). Public holidays vary by country and region — check your local calendar.
›How do I count working days in a month?
Set start = 1st of month, end = last day of month. Most months have 20-23 working days.
›Are working weeks always Mon-Fri?
We assume Mon-Fri. Some countries (e.g. parts of the Middle East) have Sun-Thu working weeks — we don't currently support that.
›Does it count both endpoints?
Yes — both start and end dates are included in the count if they're working days.
›Is the calculator free?
Yes — fully free, no signup, runs in your browser.