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Decision tree builder This online calculator builds a decision tree from a training set using the Information Gain metric |
Declination and maximum altitude of the Sun above the horizon on a given date This online calculator calculates the declination of the Sun on a given date and the maximum altitude above the horizon on that day for a given latitude |
Decomposition of a square matrix into symmetric and skew-symmetric matrices This online calculator decomposes a square matrix into the sum of a symmetric and a skew-symmetric matrix. |
Degrees-minutes-seconds to decimal degrees conversion and vice versa. This online calculator converts the value of an angle given in the degrees-minutes-seconds to degrees, expressed in decimal fraction and back from decimal fraction to degrees-minutes-seconds. |
Density of air as a function of pressure and temperature This online calculator calculates the air density value for a given pressure and temperature using the Mendeleev-Clapeyron equation for an ideal gas. |
Density of oil Recalculation of the density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements for the density of oil. The tables for recalculation" standard |
Derivative It finds one variable function derivative. Step by step differentiation solution is also provided. |
Derivative of a function raised to the power of itself A function is raised to a degree of itself a given number of times and then the derivative is taken. |
Determinant by Gaussian elimination Finding matrix determinant using Gaussian elimination in complex, rational or real numbers. |
Determinant of 3x3 matrices This calculator calculates the determinant of 3x3 matrices |
Determination of the baby's sex It's unscientific, but it surprisingly works. |
Determining air humidity with the psychrometric method This calculator determines air humidity using psychrometric method with two thermometers. |
Dew Point Calculator This calculator determines the dew point from a given temperature and relative humidity of the air. |
Digital image size in pixels and photo print size This article is about the relation between an image size in pixels and a photographic print size. First, it recommends the photographic print size for given digital image dimensions in pixels. Second, it finds the resulting pixels per inch value for a printed digital image with known linear and pixel dimensions. |
Digital images parameters comparison The calculator allows you to compare the parameters of different photographs saved in EXIF image data. |
Dilution calculator and problems solver This online calculator can calculate the molar concentration (molarity) of a solute or volume of a solution before or after the dilution. |
Dilution of solutions This online calculator allows you to find one of four parameters: volume before dilution, molar concentration before dilution, volume after dilution, molar concentration after dilution - based on the other three. It is intended for solving problems on dilution of solutions. |
Direct measurement error analysis Calculates error of direct measurements for given measured value series and confidence interval. |
Discount calculator This online calculator finds the discount from the sale price and the usual price, the sale price from the discount and the usual price and the usual price from the sale price and the discount |
Display aspect ratio and dimensions This online calculator finds screen dimensions - height, width and area, given the diagonal value and aspect ratio. |