Science tools
Chemistry, physics, maths and energy calculators. Everything runs in the browser. Inputs are kept in the URL, so any result can be bookmarked or shared.
Energy
Energy Compare
Compare retail electricity plans against your own half-hourly usage, from an Australian NMI interval export. Covers time-of-use windows, supply charges, controlled load and solar credits.
Appliance & Load Shifter
Running cost for an appliance, and the saving from shifting it off peak.
Solar & Battery Payback
Payback, NPV and IRR for a rooftop solar system, with or without a battery, over its whole life.
EV vs Petrol Running Cost
Cost per 100 km on electricity against petrol, and the fuel price where the two meet.
Chemistry
Molar Mass & Stoichiometry
Molar mass, mass percentage composition, and conversion between grams, moles and molecules.
Equation Balancer
Smallest whole-number coefficients, by Gaussian elimination over exact fractions.
Interactive Periodic Table
118 elements, with heatmaps for electronegativity, radius, ionisation energy and more.
Solutions & Dilution
Dilutions, the mass to weigh out for a target concentration, and molarity against %w/v and ppm.
Limiting Reagent & Yield
Balance a reaction, then find which reactant runs out first and what it can theoretically produce.
Physics
Projectile Simulator
Trajectories with adjustable angle, speed, height and gravity. Optional quadratic drag.
Snell's Law Ray Tracer
Refraction at a boundary, with the critical angle and total internal reflection.
RLC Resonance Analyzer
Resonant frequency, Q and bandwidth, with Bode magnitude and phase plots.
Thin Lens & Mirror
Image position and magnification for lenses and curved mirrors, with a principal-ray diagram.
Resistors & Ohm's Law
Colour bands both ways, series and parallel networks, dividers, and nearest preferred values.
Maths
Uncertainty Propagation
Propagate measurement error through a formula, and see which quantity dominates the budget.
Linear Regression
Least-squares fit for pasted x,y data, with standard errors, R² and a residual plot.
Enigma Simulator & Breaker
Encipher with a simulated Enigma M3, or recover an unknown key from ciphertext alone.