Convert between standard and scientific notation — 6,020,000,000 ↔ 6.02×10⁹. Handle Avogadro-scale numbers cleanly — free, local, no signup.
Compute semester GPA from course grades and credit hours with credit-weighted math on the standard 4.0 scale — quick academic snapshot. See what straight B's earn — free, local, no signup.
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
Count working days between two dates excluding weekends — HR teams prorate leave and payroll accurately. A 20-day leave request spans 28 calendar days — free, no signup, runs locally.
Convert numbers between binary, octal, decimal, and hex with bitwise views. Read 0xFF as 255 instantly — local math, free, no signup.
Convert between Roman numerals and numbers both ways — chapters, clocks, movie credits. Decode MCMXCIV as 1994 instantly — local math, free, no signup.
6.02×10⁹ — one non-zero digit before the point with exponent counting places. Chemistry constants read instantly.
0.000000602 → 6.02×10⁻⁷ with negative exponents. Electron masses and wavelengths live here.
6.02e9 parses directly — calculators and code emit this form. Convert to pretty ×10ⁿ for documents.
No — math runs locally in your browser. Numbers never leave your device.
Significant Figures Calculator
Round results to correct significant figures with rule explanations — 0.00450 has 3. Stop overstating lab precision — free, local, no signup.
Exponent Calculator
Raise any base to any power — squares, cubes, negative and fractional exponents with full precision. Students check 2^10 = 1024 homework in seconds — free, no signup, runs locally.
Last updated October 2026