Our science calculators solve the formulas that turn up again and again in physics classes, electronics benches and weather reports. Students use them to check homework and lab write-ups, hobbyists use them to pick the right resistor, and curious readers use them to put numbers on ideas like a light year or radioactive decay. Each tool focuses on one relationship, such as V = IR or KE = ½mv², so you can see exactly how changing one input moves the result.
How does Ohm’s law work in practice? Voltage equals current times resistance. A 12 V supply across a 4 Ω resistor drives 3 A of current.
Why does kinetic energy rise so fast with speed? Because speed is squared in KE = ½mv², doubling speed quadruples the energy. That is why braking distances grow so sharply.
Is a light year a unit of time? No, it is a distance: how far light travels in a year, about 9.46 trillion kilometres.
All of these science calculators are free, run in your browser and need no sign-up.