Miscellaneous

Find an IPv4 network, broadcast address, usable host range, subnet mask, wildcard mask, and address counts from an IP and mask.

Estimate monthly kWh use and electricity cost for appliances from watts, meter readings, or yearly label data.

Enter any two circuit values to solve voltage, current, resistance, and power, plus an optional resistor wattage check.

Decode resistor color bands or printed SMD codes into resistance, tolerance, and the allowed resistance range.

Estimate voltage drop, percent drop, load voltage, and wire loss, or find the smallest wire size that meets your target.

Convert whole numbers and Roman numerals both ways with strict validity checks and standard-form feedback.

Enter a chemical formula to get molar mass, formula mass, element counts, mass percent, and mass-mole conversion.

Calculate solution molarity from moles or from solute mass, molar mass, and final solution volume with unit conversion.

Calculate average speed, distance, travel time, or the time change between two speeds with clear unit choices.

Calculate weight force from mass and gravity, or solve for mass or gravitational acceleration in kg, lbm, N, lbf, m/s2, or ft/s2.