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Credit calculator with early repayment online
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VAT Calculator
English verb conjugation
Password generator online
Sudoku online
IP calculator online
Unit converter online (pressure, force, power, energy)
For programmers
For programmers
Online colour contrast checker
RGB ↔ HSV converter online
Online unix timestamp calculator
Regular expression tester (regex online)
HTTP headers checker
md5 online, md4, sha1
Online base64_encode, base64_decode
Convert images to base64 code (Image to base64)
Online urlencode, urldecode
Online php serialize unserialize
Mathematics
Mathematics
Resonant orbit calculator
Interpolation and Extrapolation online (linear interpolation/extrapolation)
Interpolation - Newton polynomial (online calculator)
Interpolation - Lagrange polynomial (online calculator)
Bilinear interpolation (double linear interpolation)
Table interpolation online (linear, spline, inverse)
Least squares method online (linear regression)
Curve fitting online (approximation by formula)
Numerical integration online (trapezoidal, Simpson, rectangles)
Differential equation solver: first order, second-order linear, initial value problems
Quadratic equation solver (quadratic equation online)
Root finding online (bisection, Newton, regula falsi, secant)
System of linear equations solver (Gauss, Cramer, Seidel)
Matrix multiplication online with solution
Multiply a matrix by a number online
Matrix transposition online
Matrix determinant online
Geometry
Geometry
Distance between two points in space (calculate online)
Cube volume
Parallelepiped volume
Pyramid volume
Sphere volume
Cylinder volume
Cone volume
Prism volume
Regular tetrahedron volume
Truncated cone volume
Truncated pyramid volume
Physics
Physics
Heat Calculator and Heat Balance Online
Measurement Uncertainty Calculator: Direct and Indirect
Thin Lens and Mirror Calculator with Ray Diagram
Kirchhoff’s Laws Circuit Solver Online
AC Circuit Calculator (Phasor Method)
Nuclear Reaction Calculator: Missing Particle, Q Value, Binding Energy
Engineering surveying
Engineering surveying
Traverse calculator online (closed and open traverse)
Levelling field book and level run adjustment online
Inverse and direct surveying problems online
Area from coordinates online (shoelace formula)
Machine design and metrology
Machine design and metrology
Limits and fits calculator (ISO 286)
Drive Kinematics and Electric Motor Selection
Spur and Helical Gear Design Calculator
Gearbox Course Project Wizard: Drive and Gear Design Step by Step
Theoretical mechanics
Theoretical mechanics
Point kinematics online: velocity, acceleration and trajectory from x(t), y(t)
Plane mechanism online: instantaneous centre of velocity, point velocities and accelerations
Biology
Biology
Child blood type calculator: ABO and Rh inheritance
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Biology
Biology
Child blood type calculator: ABO and Rh inheritance