Free online engineering & everyday calculators
Tooldeb is a growing hub of free, fast, no-signup online tools and calculators — starting with niche engineering utilities for hardware and embedded work.
Electronics
PCB Trace Width Calculator
IPC-2221 trace width for a target current and temperature rise, for internal and external copper layers.
RC Time Constant Calculator
soonCompute tau = R x C, cutoff frequency, and charge/discharge times for an RC circuit.
Microstrip Impedance Calculator
soonCharacteristic impedance of a microstrip trace from its geometry and dielectric constant.