Learn how to calculate molarity from moles and volume or from mass and molar mass. Includes C = n/V, worked lab examples, unit conversions, and a free concentration calculator.
Learn how to use the half-life formula to find remaining amount, elapsed time, or half-life. Includes carbon-14 dating, medical isotopes, worked examples, and a free half-life calculator.
Learn what power factor means, why watts and VA are not the same in AC systems, and how to calculate PF with PF = W ÷ VA. Includes practical UPS and inverter sizing examples plus a free browser-based calculator.
Learn how to convert watts to VA using power factor with VA = W ÷ PF. Understand why UPS and inverter sizing often needs more VA than your watt load suggests, with practical examples and a free watts-to-VA calculator.
Confused by UPS ratings like 1500VA / 900W? Learn the difference between apparent power (VA) and real power (W), how power factor limits usable output, and how to size your equipment safely with a free VA to Watts calculator.
Learn Ohm's law V = I × R and power P = V × I = I²R = V² ÷ R. Six ways to pick two knowns from voltage, current, resistance, and watts — plus a free all-in-one calculator that runs in your browser.
You cannot get watts from volts alone. Learn P = V × I for DC, P = V × I × PF for single-phase AC, P = √3 × V × I × PF for balanced three-phase (line-to-line), and P = V² ÷ R for resistive loads — plus a free volts-to-watts calculator in your browser.
Learn how to work out DC current from 12 V nominal systems using I = P ÷ V and Ohm's law. Size fuses, cables, and battery runtime for caravans, campervans, boats, and solar off-grid—with a free volts-to-amps calculator.
You cannot get volts from amps alone. Learn when to use V = P ÷ I (DC and AC with power factor), V = P ÷ (√3 × I × PF) for three-phase, and V = I × R with Ohm's law — plus a free amps-to-volts calculator in your browser.
Decode voltage, watts, VA, and current on appliance labels. Learn when to use I = P ÷ V vs power factor for AC, and use Tooladex’s free watts-to-amps calculator for breakers and cords.
Learn how to convert amps and volts to watts using P = V × I for DC, power factor for AC, and √3 for three-phase. Includes worked examples and a free amps-to-watts calculator that runs in your browser.
Learn what significant figures are, how to round to N sig figs, and how to count them. Use the Tooladex Significant Figures Calculator for measurements and reporting.
Learn how to calculate density using mass and volume, solve for mass or volume when density is known, and understand density units. Includes real-world examples and a free density calculator tool.
Learn how to calculate dilutions using C1V1=C2V2, what dilution factor means, and how to figure out how much stock and diluent to mix. Includes real lab-style examples and a free dilution calculator.
Learn how to calculate pH, pOH, H+ concentration, and OH- concentration quickly and accurately. Includes examples, formulas, and our free pH calculator tool.
Learn how to calculate molecular weight of chemical compounds quickly and accurately. Includes examples, formulas, and our free molecular weight calculator tool.