Supported Features
-
VoiceOver
-
Dark Interface
-
Differentiate Without Color Alone
Sessagesimale – Calculator
DMS angles, GPS, degrees, time
$2.99 · Designed for iPad. Not verified for macOS.
The sexagesimal calculator for angles, time and coordinates. Degrees, gon, radians and NATO mils in one tap. 100% offline.
Sessagesimale is a calculator built for anyone working with base-60 values — angles, time, geographic coordinates, surveying, astronomy, and navigation. No more manual conversions between decimal and degrees/minutes/seconds: enter values exactly as you read them on a map, a measuring instrument or a stopwatch, and get the normalized result instantly.
THREE MODES IN ONE APP
• Angle (° ' ") — with two sub-formats: DMS (degrees, minutes, seconds, e.g. 40° 42' 46") and DDM (degrees and decimal minutes, e.g. 40° 42.7667'), the standard used by many GPS receivers and in maritime/aeronautical navigation.
• Time (h m s) — for hours, minutes and seconds.
• Decimal — for a classic calculator experience.
The value converts automatically when you switch modes. Mode, DMS/DDM sub-format and memory are remembered on relaunch.
NATURAL FIELD-BY-FIELD ENTRY
A contextual key guides your input: tap • ' to move from degrees to minutes, • " for seconds. On seconds (or minutes in DDM) it becomes your language's decimal separator — a period in English, a comma in many other languages. The active field is always highlighted.
FULL ARITHMETIC
Addition and subtraction between sexagesimal values with automatic carrying (45' + 30' = 1° 15'), multiplication and division by a scalar, chained operations, repeat the last calculation with "=". Dividing by zero shows an explicit error instead of a silent, wrong result.
DUAL DISPLAY, ALWAYS VISIBLE
As you type in sexagesimal format, read the decimal equivalent in real time (and vice versa).
CONVERSIONS PANEL
One tap to see the current value in every format at once — DMS, DDM, time, decimal degrees, radians, gon, and the hours↔degrees (×15) conversion used in right ascension and time zones. Tap any row to copy it.
MEMORY & HISTORY
MC, MR, M+, M– keys with an always-visible indicator. Every calculation is added to a persistent history: tap an entry to reuse its result, swipe to delete it, share it all as text.
COPY, PASTE, SHARE
Copy the current value, paste one from the clipboard (it recognizes decimal formats with a period or comma, sexagesimal values with °, ', " or typographic symbols, and the 12:34:56 notation), share via the system sheet.
FOR IPAD AND MAC
Hardware keyboard supported: digits, operators, Return for the result, Esc to clear everything.
ADAPTIVE INTERFACE
Layouts for iPhone (portrait and landscape) and iPad, light and dark mode, three alternative icons, full VoiceOver support with contextual labels, haptic feedback. A (?) button brings up the onboarding tutorial at any time.
APPLE WATCH
On your wrist, even without your iPhone: a calculator with all three modes (Angle, Time, Decimal), the four operations, DMS/DDM format, a history of recent calculations and a conversions panel. A compact keypad designed for the small display, with haptic feedback. The watch's history and settings are independent from those on your iPhone.
PRIVACY
Completely offline. No account, no data collection, no connection to external servers. History and memory stay on your device only.
WHO IT'S FOR
Surveyors, geometers, engineers; amateur and professional astronomers; sailors and pilots; students of trigonometry and geodesy; anyone who needs to add angles or durations without mental conversions.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New: Apple Watch app. A calculator with all three modes, history and conversions on your wrist, even without your iPhone.
The developer, Vittorio Spinelli, 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.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Vittorio Spinelli
- Size
- 1.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.6 or later.
- iPhone
Requires iOS 16.6 or later. - iPad
Requires iPadOS 16.6 or later. - Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Italian, Japanese, Korean, Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Vittorio Spinelli
