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