Science & Engineering

Unit-aware calculators and converters for physics, chemistry, electrical work, construction and cars — with the formulas visible, so you can check the working instead of trusting a black box. Electrical tools cover Ohm's law, resistor color codes, voltage dividers, LED resistors, power from voltage and current, series and parallel resistors, capacitor codes, battery life, solar panel sizing, UPS backup time, wire gauges, electricity cost and generator load. Chemistry tools include a molar mass calculator, a chemical equation balancer, an interactive periodic table, molarity and dilution calculators, a pH calculator, the ideal gas law and density. Physics covers speed, distance and time, acceleration, force, kinetic and potential energy, projectile motion, free fall, work and power, pressure, and wavelength and frequency. Construction calculators estimate concrete volume, bricks, tiles, paint, flooring, roof pitch, stairs, rebar and steel weight, water tank capacity and air conditioning tonnage. Automotive tools work out fuel cost, mileage, tire sizes and gear ratios. Students use these to check homework with the steps shown, engineers and electricians use them for quick on-site figures, and homeowners use the construction tools to estimate materials before buying. Everything runs entirely in your browser, free and with no account, and works offline once the page has loaded.