Work days calculatorCalculators

Work days calculator. Weekends and holidays left out.

Pick two dates to count the work days between them, or a start date and a number to find the date that many work days later. Choose which days are the weekend, paste your holidays or add the US federal ones, and see weekend and holiday days counted apart.

Cost to you

Free

Runs in your browser. No signup, no API call, no limit per hour.

browser
runs in: none
API calls: none
account

Use it now

Use the Work days calculator here

It runs in your browser. Nothing you type is sent anywhere, there is no signup and no limit.

Dates

Calculate

Start date

End date

Count the start dateCount the end dateBoth on matches Excel NETWORKDAYS.

Weekend and holidays

Weekend days

Highlighted days are days off. Pick Fri and Sat, or only Sun, for other work weeks.

Holidays, one date per line (YYYY-MM-DD)

Text after # is a note. The US button adds the observed federal holidays in your date range, the days federal offices close.

Result

66 work days

Calendar days counted92

Weekend days26

Holidays on work days0

Weeks, about13.1

Calculated in your browser on calendar dates, so time zones and daylight saving never move a day.

Run it from your agent

Copy one prompt, give it to your agent.

Fill in the placeholder, paste it, and the agent runs the same job with current data on your looot account and shows the cost.

You give it: two dates, or a date and a number of work days.
Billed per call, nothing while your agent is idle.
The agent shows the price before it calls.

Prompt: Work days calculator

Use looot to set due dates for these tasks: [task, start date, work days needed]. 1. Set up https://looot.ai/skill.md. 2. Count work days Monday to Friday and skip these holidays: [dates]. 3. Do not count the start date, as Excel WORKDAY does. 4. Return a table of task, start date, work days and due date.

Give this to your agent

Setup command

set up looot - https://looot.ai/skill.md

What comes back

What your agent gets from work days calculator

Field names as the providers return them. The exact set varies by endpoint, and your agent reads it from the catalog.

work days
calendar days
weekend days
holidays on work days
end date after adding work days

Use it for

What people do with work days calculator

Set a due date
Find the date 10 work days after a contract signs or an order lands.
Count billable days
See how many work days a month or a project ran, holidays left out.
Other work weeks
Set Friday and Saturday, or only Sunday, as the weekend for teams outside the US.
Check agent math
Compare a deadline your agent worked out with the calendar count here.

Set up once

Three steps. Your agent does the rest.

Paste one prompt into your agent

Set up looot

Done, looot is connected.

Copy one prompt from /connect into Claude Code, Cursor, or any MCP agent. No SDK, no dashboard click-through first.

Your agent finds the right operation

Hunter$0.0265

Exa$0.0090

Diffbot$0.0032

The agent finds the operation it needs and sees the price first. It calls nothing blind.

You watch what it cost

Hunter$0.0265

Exa$0.0090

Diffbot$0.0032

Total$0.0387

Every call settles for its quoted price and lands in the ledger. You always know what ran and what it cost.

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FAQ

Questions about work days calculator

Pick the start and end dates at the top of this page. The result shows the work days, with weekend days and holidays counted apart. Both dates count by default, as in Excel NETWORKDAYS.

261 weekdays, Monday to Friday. Take out the 11 US federal holidays as observed and 250 are left. Set the dates to 2026-01-01 and 2026-12-31 and press Add US federal holidays to check.

Switch to Add work days to a date, pick the start date and type the number. The start date is not counted, as in Excel WORKDAY, so 1 work day after a Friday is the Monday. A negative number counts back.

Only the ones in the holiday box. The Add US federal holidays button fills in the observed federal holidays for your dates, from 5 U.S.C. 6103: a holiday on a Saturday moves to the Friday, on a Sunday to the Monday. State and company holidays you add yourself.

Yes. Click the days to mark them off. Friday and Saturday, or Sunday alone, work the same way as Saturday and Sunday.

Usually, yes. Both mean a weekday that is not a public holiday. Banks and courts may also close on other days, so add those to the holiday box.

With both dates counted it matches NETWORKDAYS.INTL for the same weekend days and holidays, and the add mode matches WORKDAY.INTL. An end date before the start gives a negative count, as Excel does.

Yes. It runs in your browser with no account and no limit, and the dates never leave your device.

For agents

tool: Work days calculator
category: Calculators
input: Two dates, or a date and a number of work days
output: work days, calendar days, weekend days, holidays on work days, end date after adding work days
price: per call, read live from the catalog on the web page
web tool: runs in the visitor's browser, no API call, free and unlimited
schedule: on demand
setup: https://looot.ai/skill.md
llms.txt: https://looot.ai/llms.txt
updated: 2026-10-16

markdown /free-tools/work-days-calculator.md

Run work days calculator from your own agent.

Start your workspace, top up, and paste the prompt into the agent you already use. It runs the job with live data and shows the cost first.

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