Project plans, leave entitlements, payroll cut-offs. The ChrysoKit Workdays Calculator counts business days between two dates, with custom weekends and a holiday list so it matches your office calendar.
Why use it
Calendar arithmetic in spreadsheets is easy to get subtly wrong. A purpose-built tool with weekend and holiday settings removes the guesswork.
How to use the Workdays Calculator
- Enter the start and end dates.
- Pick which weekdays count as weekends (Saturday and Sunday by default; pick any combination for non-standard regions).
- Add public holidays to exclude them from the count.
- Read the total workdays, weekend days, and excluded holidays.
Features worth knowing
Custom weekends
Pick any combination of weekdays as non-working. Some regions use Friday-Saturday weekends instead of Saturday-Sunday, the tool handles it.
Holiday list
Add public-holiday presets for several common countries, or type in custom dates to match your specific office calendar.
Live breakdown
Total workdays, weekend days, and excluded holidays show up together so you can verify the math at a glance.
Pro tips
- Different industries use different work weeks. The tool supports anything from a three-day to a six-day week.
- When estimating delivery dates, count workdays not calendar days. It matches how teams actually plan.
- Public holidays vary by country. Maintain a single list of dates and reuse it across projects.
Privacy first. The Workdays Calculator runs entirely in your browser. Nothing is uploaded.
Use the Workdays Calculator for project planning, leave estimates, and SLA windows. The math is small but the savings on rework are not.
Open the tool: Workdays Calculator →
The December deadline that wasn't: counting working days under fire
A contract signed on December 1st promises delivery "within 15 business days". The project manager pencils December 19th and books the holidays. The count, performed properly, says otherwise: three weekends remove six days, and in Greece the calendar then subtracts more around the Christmas period as holidays land mid-count. The true deadline slides into January... or, read from the other side, the comfortable-looking 15 days contain far less working time than the calendar suggested. Both parties had signed the same sentence and were holding different dates in their heads.
This is the recurring shape of working-day disputes: not bad faith, but two unstated conventions colliding. Does the count start the signing day or the next business day? Whose public holidays apply when the parties sit in different countries... the supplier's, the client's, or the contract's governing jurisdiction? Is December 24th a working day? (In some companies yes, by national calendar yes, in practice nobody answers email.)
The professional fix costs one sentence at drafting time: state the deadline as both a count and an absolute date... "15 business days, i.e. by 9 January 2026"... and the calculator's job is producing that second number before signing, not arbitrating the argument after. A date computed in ten seconds upfront has settled more delivery disputes than any clause ever written.