All online calculators

• Digital image size in pixels and photo print size

  This article is about relation between image size in pixels and photographic print size. First, it recommends photographic print size for given digital image dimensions in pixels. Second, it finds resulting pixels per inch value for printed digital image with known linear and pixel dimensions.

• Direct observation error analisys

  Calculates error of direct measurements for given measured value series and confidence interval.

• Display aspect ratio and dimensions

  This online calculator finds screen dimensions - height, width and area, given the diagonal value and aspect ratio.

• Distance across the surface vs distance through the Earth

  This calculator calculates distance across the surface of the Earth and distance through the Earth for given two points, then compares them.

• Distance between two cities

  Calculates the distance between the two cities. Uses the directory of geographical city coordinates for the calculation.

• Distance calculator

  Calculates distance between two geographic coordinates using haversine formula.

• Distance through the Earth

  This calculator calculates the distance from one point on the Earth to another point, going through the Earth, instead of going across the surface.

• Dollars to rubles and vice versa by Central Bank of Russia exchange rate
• Doppler Effect in sound

  Calculation of frequency and wavelength change for a moving source

• Double exponential smoothing

  Description and example of the double exponential smoothing

• Earth Radius by Latitude (WGS 84)

  This online calculator calculates Earth radius at given latitude using WGS 84 reference ellipsoid

• Effective interest rate
• Ellipsoid

  Calculates ellipsoid and spheroid volume and surface area.

• Email extractor

  This online calculator parses emails from block of text using regular expression

• Energy measurement units

  Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)

• Equilibrium moisture content

  The calculator gives the wood equilibrium moisture content by given temperature and relative humidity.

• Estimated Mean of a Population

  This online calculator allows you to estimate mean of a population using given sample

• Evaluating expressions

  This online calculator substitutes a specific value for each variable, and performs the operations, evaluating the given expression.

• Exotic length units

  Converter from exotic length units to meters

• Exponential Moving Average

  Exponential Moving Average calculation by candles