Science & Engineering Calculators
Scientific and engineering tools for physics, chemistry, electrical engineering, and weather calculations. Voltage, resistance, density, molarity, and more.
Physics
Electrical Engineering
Chemistry
Which Calculator Should I Use?
About Science & Engineering Calculators
Science and engineering calculations underpin everything from home electrical work to laboratory experiments and weather forecasting. Our engineering calculators cover physics fundamentals (density, mass, force), electrical engineering (Ohm's Law, voltage drop, resistor codes), chemistry (molarity, molecular weight), and atmospheric science (wind chill, heat index, dew point). Each tool uses the same industry-standard formulas found in textbooks and professional references.
Why use these calculators?
- Accurate results based on standard formulas
- Fast and mobile-friendly interface
- Completely free to use with no registration
Best Practices
Always double-check your inputs for accuracy. While our tools are rigorous, for critical financial or health decisions, we recommend consulting with a professional explanation.
Frequently Asked Questions
What formulas do the electrical calculators use?
Our electrical calculators use standard formulas including Ohm's Law (V=IR), power equations (P=VI), and NEC voltage drop standards.
Are the weather calculators based on official formulas?
Yes, we use the NOAA wind chill formula and the Rothfusz regression for heat index calculations.
Can I use the density calculator for gases?
Yes, but gas density changes significantly with temperature and pressure. Enter values at the specific conditions you need, or use standard temperature and pressure (STP) values.
What wire gauge should I use?
Wire gauge depends on current draw and distance. Use our Voltage Drop Calculator to check that your chosen wire size keeps voltage drop below 3% for branch circuits (NEC recommendation).