Get your circuits
in flow.
Circflow is an online toolbox for electronics and digital electronics: 49 formula- and standard-driven tools + 14 chip pinout references — calculators, encoders/decoders, IEC/IPC lookups, pinout diagrams, and digital-logic simulators, all running right in your browser. Zero backend, zero tracking, usable offline forever.
Whatever you need, open it and go
Pick from five tool categories, or jump straight there with the search box — LED, capacitor, binary, pinout, it's all here. Want to learn digital electronics systematically? Check out the two guided tracks.
PinoutsFeatured
8/8Decoders
8/8Standards
11/11- PCB Manufacturability Class Checker →
- IC Parameter Comparison →
- Component Cross-Reference Finder →
- SMD Package Size Chart →
- SI Prefix / Unit Converter →
- AWG Wire Gauge Reference →
- Logic Level Voltage Reference →
- Electronic Symbols Reference →
- Ethernet Cable Categories (Cat5e–Cat8) →
- USB Versions & Speeds Reference →
- E-Series Standard Values (E6–E96) →
Calculators
20/20- LED Resistor Calculator →
- Ohm's Law Calculator →
- Voltage Divider Calculator →
- Series / Parallel Resistor Calculator →
- Series / Parallel Capacitor Calculator →
- RC Time Constant Calculator →
- 555 Timer Calculator (Astable) →
- PCB Trace Width Calculator →
- PCB Impedance Calculator →
- BOM Cost Estimator →
- Component Selection Matrix →
- Op-Amp Gain Calculator →
- Low-Pass Filter Calculator →
- High-Pass Filter Calculator →
- Wheatstone Bridge Calculator →
- Reactance Calculator (Xc / Xl) →
- LC Resonant Frequency Calculator →
- Battery Life Calculator →
- dBm / dBW / Watt Converter →
- Decibel (dB) Gain Calculator →
Digital
21/21- Gray Code Converter →
- BCD Converter →
- ASCII / Unicode Lookup →
- Parity Bit Calculator →
- Bits to Range Calculator →
- 7-Segment Display Decoder →
- Hamming Code Calculator →
- Binary Add / Subtract Calculator →
- Number Base Converter →
- Bitwise Calculator →
- CRC Calculator →
- IEEE 754 Floating-Point Converter →
- Two's Complement Calculator →
- Logic Gate Truth Table Generator →
- Karnaugh Map Solver →
- Flip-Flop Simulator (D / JK / T / SR) →
- Counter Simulator (Mod-N Up / Down) →
- Shift Register Simulator (SISO/SIPO/PISO) →
- Finite State Machine Simulator (Mealy / Moore) →
- Boolean Algebra Simplifier →
- Minterm / Maxterm Expander →
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Three things you can rely on
Always there when you open it
No connection, no login, no fees. Bookmark it and it'll still compute tomorrow, when you're offline, even ten years from now — no third-party service can go down and take it with it.
Numbers you can use as-is
E24, color codes, IEC/IPC — these standard values come straight from authoritative standard tables, not estimated or fudged. Buy components and order prototypes off the results without worrying about a single wrong digit.
You get it on the first try
Every tool tells you what to put in each field, gives you a one-click example to try, lets you look up terms on the spot, and explains what the result "means". No need to wade through a tutorial first.