Online calculator: Runge–Kutta method
https://planetcalc.com/8400You can use this calculator to solve first-degree differential equation with a given initial value using the Runge-Kutta method AKA classic Runge-Kutta method (because there is a family of Runge-Kutta methods) or RK4 (because it is a fourth-order method). and enter the right side of the equation f (x,y) in the y' field below.
Online calculator: Explicit Runge–Kutta methods
https://planetcalc.com/8401Explicit Runge–Kutta methods. This online calculator implements several explicit Runge-Kutta methods so you can compare how they solve first degree differential equation with a given initial value. Articles that describe this calculator. Explicit Runge–Kutta methods; Explicit Runge–Kutta methods. y' Initial x.