Browse 3 free engineering calculators with instant answers, step-by-step formulas, and related tools. No sign-up needed; results appear as you type.
Engineering arithmetic here covers circuits, electrical power, and hole-punching force. The parallel-resistor calculator gives the total resistance of resistors wired in parallel — the reciprocal-of-reciprocals calculation that is easy to fumble by hand. The power calculator turns voltage and current into watts (P = V × I). The punch calculator estimates the force to punch a hole from cut perimeter, sheet thickness, and shear strength (F = L × t × τ). Each one shows the formula behind the answer and updates as you type, so you can check a bench measurement without a spreadsheet. Free, no sign-up, with related calculators linked from every page.
Calculate total resistance in parallel.
Calculate electrical power.
Calculate the force required to punch a hole from the cut perimeter, sheet thickness, and material shear strength.
These tools are organized around the same topic so you can move between related calculations without searching from scratch.