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Business Days Calculator API
Official public data, ready to use.
Used by: Developers and data teams.
Working-day maths with each country's (and state's) public holidays: add or subtract N business days to a date (payment terms, delivery, legal deadlines), or count business days between two dates. Custom weekend (e.g. Fri-Sat). Returns the holidays that were skipped. < 50 ms.
Try it live, no sign-up
Run the example as is, or change the input. 5 own tries a day without a key.
Example request
curl -X POST https://radarbg.com/v1/business-days \
-H "X-API-Key: YOUR_KEY" -H "Content-Type: application/json" \
-d '{"country": "DE", "start": "2026-12-22", "add": 5}'
Answer: {"ok": true, "count": N, "items": [...], "usage": {...}}. Failed calls are not counted.
Inputs
| Field | Type | Description |
|---|---|---|
country | string | ISO 3166 alpha-2 code, e.g. DE, BG, US |
subdivision | string | State/region code (optional) |
start | string | Start date YYYY-MM-DD (default today) |
add | integer | Business days to add (negative = back) |
end | string | Or an end date YYYY-MM-DD to count business days between |
weekend | string | Weekend weekdays, 0=Mon..6=Sun, default 5,6 |
Price
Included in every plan: 500 calls a month free, then from €5 a month for 5,000 calls across all APIs.
Questions
What does the Business Days Calculator API do?
Official public data, ready to use.
Where does the data come from?
Working-day maths with each country's (and state's) public holidays: add or subtract N business days to a date (payment terms, delivery, legal deadlines), or count business days between two dates. Custom weekend (e.g. Fri-Sat). Returns the holidays that were skipped. < 50 ms.
How much does it cost?
500 calls a month are free with no card. Paid plans start at EUR 5 a month for 5,000 calls and include every API on Radar. Failed calls are not counted.
Can I use it without writing code?
Yes. Try it live on this page, use our free browser tools, or ask us to run it on your list as a service.