Department № 07

Science.

Physics, electricity, and engineering essentials.

8 tools in this department

Science and engineering calculators for physics, electricity, and mechanical work: density, force, speed, acceleration, Ohm's law, voltage drop, resistor color codes, and horsepower. Aimed at students, hobbyists, and technicians who need a quick, formula-backed answer without opening a textbook. Every tool shows the equation it applied so results are easy to check by hand.

01
Density Calculator
Solve for density, mass, or volume from the other two using ρ = m / V.
02
Force Calculator
Newton's second law solver — find force, mass, or acceleration from the other two.
03
Speed / Velocity Calculator
Solve for average speed, distance, or time using the classic v = d / t relationship.
04
Acceleration Calculator
Change in velocity over time — plus distance covered and g-force equivalent.
05
Ohm's Law Calculator
Solve for voltage, current, or resistance from the other two — plus the resulting power draw.
06
Voltage Drop Calculator
Wire voltage drop from resistivity, length, current, and AWG cross-section — with a % check against 120 V and 230 V.
07
Resistor Color Code Calculator
Decode a 4-band resistor from band 1, band 2, multiplier, and tolerance colors.
08
Horsepower Calculator
Horsepower from torque + RPM, kW conversion, or estimated from vehicle weight and quarter-mile time.

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