Engineering Calculators
25 tools, each with formula and worked examples
Ohm's law, voltage drop, wire sizing, MTBF, and fluid mechanics tools.
Electrical· 5
Resistor Calculator
Decode 4/5/6-band resistor color codes to ohms or reverse-calculate the color bands from any resistance value.…
Electricity Cost
Calculate the energy cost of any electrical appliance. Pick from 20 common appliance presets or enter custom w…
Ohm's Law
Calculate voltage, current, resistance, or power using Ohm's Law. Enter any two known electrical values to sol…
Voltage Drop
Calculate voltage drop over a wire run based on AWG gauge, wire length, and current. Checks compliance with th…
Wire Gauge
Find the correct AWG wire gauge for any electrical circuit based on current, conductor material, insulation ra…
General· 15
IP Subnet Calculator
Calculate network address, broadcast address, usable host range, and total hosts for any IPv4 subnet. Includes…
Bandwidth Calculator
Calculate file transfer times based on connection speed. Includes TCP overhead simulation and clear bit vs byt…
Password Gen
Generate cryptographically secure passwords with customizable length and character types. Free online calculat…
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text instantly. Supports text and file input with live encoding…
URL Encode
Encode text for safe URL transmission or decode URL-encoded strings. Shows character mappings for special char…
Token Converter
Estimate token counts for any text across OpenAI (cl100k_base), Claude, Llama 3, and General tokenizers. Free,…
AI Token Pricing
Compare token pricing across 12 models from 6 providers: GPT-5, Claude 4.7, Gemini 3.1, DeepSeek V3, Grok 3, L…
Crypto Hash
Generate cryptographic hashes locally in your browser using SHA-256, MD5, SHA-1, SHA-384, SHA-512, and Keccak-…
Cookie Consent
Generate GDPR-compliant cookie consent banners with customizable position, layout, and color theme. Get ready-…
pH Calculator
Calculate pH, pOH, H+ and OH- ion concentrations in aqueous solutions. Enter any known value to get the comple…
Nusselt Number
Calculate the Nusselt number from convective heat transfer coefficient, characteristic length, and fluid therm…
Buffer Capacity
Calculate buffer capacity (β) using the Van Slyke equation. Find how much acid or base your buffer can neutral…
Prandtl Number
Calculate the Prandtl number from viscosity, specific heat, and thermal conductivity. Fluid classification for…
Froude Number
Calculate the Froude number for open channel flow, spillways, and ship hulls. Determine if flow is subcritical…
Freezing Point Depression
Calculate freezing point depression using the van't Hoff equation. Find how salt, antifreeze, or any solute lo…
Mechanical· 3
Gear Ratio
Calculate output RPM, output torque, or gear ratio for any gear system. Supports speed reduction, overdrive, a…
Fluid Flow Rate & Pipe
Calculate pipe flow velocity, volumetric flow rate, or required pipe diameter using the continuity equation. S…
Lead Screw
Calculate required torque, mechanical advantage, and power for Acme and ball screw drives. Essential for 3D pr…