KARL Business Day Calculator
Business Day Calculator Pro
Only for iPhone
Free · Designed for iPhone
iPhone
Precise deadline calculation for legal & finance. Business days, legal deadlines, roll conventions & holiday calendars with full audit trace for compliant documentation.
KARL is the precise business day and deadline calculator for legal and financial workflows.
Whether contract deadlines, settlement dates, or compliance deadlines - calculate business days reliably and document every step with full audit trace.
For Lawyers, Bankers & Finance Professionals
BUSINESS DAY CALCULATOR (T+N)
Add or subtract N business days from a start date - non-business days are automatically skipped
ROLL CONVENTIONS
Adjust dates according to common market standards (Following, Preceding, Modified Following, Modified Preceding, Unadjusted)
LEGAL DEADLINE CALCULATION
Calculate statutory deadlines according to German law (BGB) with start rule, period (days/weeks/months/years), and optional business day adjustment
COUNT BETWEEN
Count business days between two dates - including or excluding boundaries
CALENDAR OVERVIEW
Visualize months/years with holiday lists and business/non-business marking per day
AUDIT TRACE WITH PROOF
Tabular documentation for each date with business day status, reason, and counter-check for plausibility verification
EXPORT & SHARE
Share reports as text, send via email, or copy directly to clipboard
Supported Calendars:
Germany (all federal states), UK Bank Holidays (England & Wales, Scotland, Northern Ireland), US Federal Holidays, TARGET2 (EU Payments)
KARL doesn't just show you the result - it documents every calculation step. Perfect for contracts, compliance documentation, and when every day counts.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New Dark Mode enabled via the Info-section; Added Information content and Legal Deadline calculation can be done for all supported Calendars including. TARGET2 (EU), US and UK!
The developer, Janosch Zimmer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Janosch Zimmer
- Size
- 1.2 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Janosch Zimmer