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Formula Library

Searchable knowledge base of formulas — each with its own page, linked tools, and related formulas.

22 formulas

Encodings & numbers (5)

5 matches· Encodings & numbers

Encodings & numbers

5
  • Number base conversionRead digits in the source base, then rewrite the same integer in the target baseChange how an integer is written without changing its value.Specialty
  • Roman numeralsMap Roman symbols (I, V, X, L, C, D, M) with subtractive pairs (IV, IX, XL, …)Encode integers with Roman symbols and subtractive pairs.Specialty
  • ASCII and Unicode code pointsMap characters to Unicode/ASCII code points (and the reverse)Translate between text characters and numeric code points.Specialty
  • Scientific notationRewrite as significand × 10^exponent (normalized scientific form)Express large or small numbers as a significand times a power of ten.Specialty
  • IPv4 address formsTreat IPv4 as a 32-bit integer (or dotted octets) and convert between formsRewrite an IPv4 address as dotted decimal or a single integer.Specialty

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  • Percentage proportionamount = (percent / 100) × whole→
  • Arithmetic and weighted meanmean = sum / count · weighted = Σ(x w) / Σw→
  • Exponentiationbase^exponent = result→
  • Fraction arithmetica/b ± × ÷ c/d → reduced form→
  • Wavelength and frequencyf = c / λ, with c ≈ 299,792,458 m/s (speed of light in vacuum)→
  • Percent errorpercent error = |observed − true| / |true| × 100%→

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Popular

  • Percentage proportionamount = (percent / 100) × whole
  • Arithmetic and weighted meanmean = sum / count · weighted = Σ(x w) / Σw
  • Exponentiationbase^exponent = result
  • Fraction arithmetica/b ± × ÷ c/d → reduced form
  • Number base conversionRead digits in the source base, then rewrite the same integer in the target base
  • Wavelength and frequencyf = c / λ, with c ≈ 299,792,458 m/s (speed of light in vacuum)
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