Free online science and maths tools

Starts a Raspberry Pi Pico project for simulating C or MicroPython code with virtual parts.

Zoomable 3D map of nearby stars in the Milky Way.

Calculates frequency, duty cycle and component values for a 555 timer astable circuit.

Fits dose-response data to get an EC50 value and curve.

Fits dose-response data to get an IC50 value and curve.

Rotates a shape around a chosen point and shows the new coordinates.

Plots a 3D surface from an equation z equals f of x and y that you type.

Draws Lissajous curves from two sine waves with adjustable frequency and phase.

Estimates pi by randomly scattering points in a square and counting those in a circle.

Simulates a body orbiting a mass with adjustable starting speed and distance.

Shows the frequency spectrum of sound from your microphone or a test tone.

Displays audio from the microphone as an oscilloscope trace.

Maps a wavelength of light to its visible colour with a slider.

Estimates the PCB trace width needed to carry a given current within a temperature rise.

Calculates the speed of air moving through a duct for HVAC design.

Interactive article with flow simulations that explain how wings generate lift.

Metric and imperial unit converters with conversion tables.

Plots magnitude and phase of a transfer function with presets for common filters.

Assemble a DNA strand base pair by base pair in an interactive.

Scientific calculator in Portuguese with trig and log functions.

Portuguese matrix calculator for common operations.

Zoom from a coffee bean down to atoms to compare the size of cells and molecules.

Runs chi-square tests of independence or fit and returns the p-value.

Computes chi-square statistics and P values for contingency tables.