Thirty calculators. One sentence finds yours.
Thirty calculators, from LED resistors to radio links
Twenty new tools join the ten you knew: Zener and LM317 resistors, voltage dividers, 555 timers, RC filters, battery run time, radio path loss, ultrasonic range, motor Kv, wire drop and more. Each one solves for any variable and rounds to a standard part value.
Build the sentence, or just type it
Start with “I want to find…”, “I am building…” or “I have…” and fill one blank at a time, or type “resistor for a blue LED on 12 V at 20 mA”. The right tool opens with your numbers already in place.
Answers that flow into the next calculation
Every result comes with short expert notes: resistor wattage, LED headroom, battery losses, radio link budgets and more. Carry the answer into a second sentence, then copy a link that replays the whole chain, answer included.
Also today: six suppliers live all day
Daily price archiving now runs in small early-morning slices, so DigiKey and Mouser answer every search. Slow suppliers get more time, unreachable ones are named with a retry, and every encyclopedia article is readable before any script loads.