Working days between dates
For lead times and payment terms — Monday to Friday, weekends excluded.
Date range
Working days
— Monday to Friday only, across 14 calendar days.
Weekends only, not bank holidays. This counts Monday-Friday only — check for bank holidays falling in the range separately.
"Five working days" and "five days" aren't the same promise, and the gap between them is exactly where a lead time or payment term goes wrong. Pick a start date and an end date and this tool counts the actual Monday-to-Friday working days between them, so a quote that promises "materials in 3 working days" or terms that say "payment due within 14 working days" can be turned into a real calendar date without doing it by hand.
Why this trips people up
Depending on where a date range falls, the same number of calendar days can contain anywhere from zero to two extra weekends worth of non-working days. Fourteen calendar days starting on a Monday contains exactly ten working days — but start that same fourteen-day count on a Thursday and it still only contains ten working days, just spread differently, which is easy to miscount by eye. Payment terms and supplier lead times are usually quoted in working days specifically because weekends genuinely don't count, so getting the real date matters for cash flow and for setting the right customer expectation.
A worked example
A customer's invoice is dated Thursday, with 14-working-day payment terms. Counting calendar days naively puts the due date just over two weeks out — but with two full weekends falling inside that stretch, the actual due date lands four calendar days later than a quick mental count would suggest. That's four extra days a payment might sit unchased if the wrong date went into the diary.
Where this is useful beyond invoicing
The same sum applies to material lead times ("delivery in 5 working days"), quote validity periods, and staged payment schedules with a working-day gap between stages. Any time a term is written in working days rather than calendar days, this converts it to an actual date without needing to count weekends off a wall calendar — useful when you're quoting on the spot and need to give a customer a real date rather than a vague "about two weeks."
What this isn't
This counts Saturdays and Sundays as the only non-working days — it doesn't know about bank holidays, and UK bank holidays fall on different dates depending on the nation and the year, so they need checking separately for any date range that might contain one. It also doesn't count the start date itself as a working day, matching how "X working days from today" is normally meant in a quote or set of terms.
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