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Octa
The beautiful calculator for professionals. Write calculations naturally and get instant results. Currency conversion, unit math, timezones, dates, and more.
- 40+ currencies with live exchange rates
- 100+ unit conversions
- 500+ timezone cities
- Date arithmetic & health calculators
- Cross-platform: macOS, Windows, Linux
$25 one-time • lifetime license
$150 + 20% $180.00
45 EUR to USD $48.65
5 miles in km 8.05 km
time in Tokyo 2:30 AM
today + 17 days Dec 18, 2025
BMI 75kg, 1.8m 23.15
Total $228.65
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