Find the right tool
for the job.

Estimate net solar installation cost, simple payback timing, and first-year savings after incentives and maintenance.

Solve voltage, current, resistance, and power from any two core circuit values without doing the algebra by hand.

Decode a four-band resistor into its nominal resistance, tolerance, and min-max value range.

Size the series resistor for an LED string from supply voltage, forward voltage, and target current.

Turn two resistor values into output voltage, divider current, and per-resistor power dissipation.

Estimate usable watt-hours and runtime from battery voltage, amp-hours, load power, and system efficiency.

Project daily, monthly, and yearly energy use plus electricity cost from device wattage and usage time.

Combine a list of resistor values in series or parallel and see the equivalent resistance at a test voltage.

Calculate RC time constant behavior, including 63%, 90%, and 99% charge timing.

Estimate solar harvest and battery charge time from panel wattage, sun hours, and system losses.

Convert motor steps, microstepping, and travel-per-revolution into machine motion calibration values.

Estimate print cost from filament mass, spool pricing, print time, and electricity usage.

Convert filament mass into usable length using diameter and material density assumptions.

Turn lumber dimensions and quantity into board feet, cubic volume, and an estimated total material cost.

Estimate how many parts fit on a sheet, compare rotation, and see the waste percentage before cutting.