Math & Numbers
Practice significant-figure rules with step-by-step feedback: count sig figs, round to N sig figs, convert to scientific notation, and propagate through +/−/×/÷.
significant-figures-sandboxMath & Numbers
Combine capacitors in series/parallel, compute reactance Xc and RC time constant, with schematics and a reactance curve
capacitor-calculatorMath & Numbers
Combine resistors in series, parallel, or an arbitrary +/| expression, with per-resistor voltage and power
resistor-series-parallel-calculatorMath & Numbers
Convert arcminutes to degrees with configurable decimal precision
arcminutes-to-degreesMath & Numbers
Convert arcseconds to degrees with configurable decimal precision
arcseconds-to-degreesMath & Numbers
Convert gradians to degrees with configurable decimal precision
gradians-to-degreesMath & Numbers
Convert standard atmospheres to kilopascals with configurable decimal precision
atm-to-kpaMath & Numbers
Convert horsepower to kilowatts with configurable decimal precision
hp-to-kwMath & Numbers
Convert horsepower to watts with configurable decimal precision
hp-to-wattMath & Numbers
Convert joules to electronvolts with configurable precision
joule-to-electronvoltMath & Numbers
Convert BTU to joules with configurable decimal precision
btu-to-jouleMath & Numbers
Convert joules to BTU with configurable decimal precision
joule-to-btu