以下のガイドはまだ日本語に翻訳されていないため、英語で表示しています。計算機自体はすべて日本語に対応しています。
この計算機の使い方
- Enter the first duration.
- Choose add or subtract.
- Enter the second duration. Values over 60 minutes or seconds are fine; they are carried over automatically.
計算式
Both durations are converted to seconds, combined, and converted back.
seconds = days × 86,400 + hours × 3,600 + minutes × 60 + seconds
Example
- 2 h 45 min 30 s + 1 h 30 min 45 s.
- = 9,930 s + 5,445 s = 15,375 s.
- = 4 hours, 16 minutes, 15 seconds (4:16:15).
よくある質問
How do I convert minutes to decimal hours?
Divide by 60. For example, 1 hour 30 minutes = 1.5 hours. The total hours line shows this automatically.
Can the result be negative?
Yes. Subtracting a longer duration from a shorter one gives a negative result, shown with a minus sign.
How do I calculate hours worked between two clock times?
Use the hours calculator, which handles start and end times, breaks and shifts past midnight.