Science & Engineering Tools
Free scientific and engineering calculators that run entirely in your browser—no installs, no watermarks.
Every tool is free, watermark-free, and runs entirely in your browser—nothing uploads to our servers. If anything needs extra permissions, we call it out right away.
Ohm's Law Calculator
Solve for voltage, current, or resistance with automatic unit guidance.
Series & Parallel Resistor Calculator
Compute equivalent resistance for series and parallel resistor networks.
Resistor Color Code Decoder
Translate resistor color bands into resistance values and tolerances.
LED Resistor Calculator
Determine the ideal series resistor for safely driving LEDs.
Reactance Calculator
Calculate capacitive or inductive reactance at any frequency.
RC & RL Time Constant
Find the time constant for RC and RL circuits instantly.
Frequency ↔ Wavelength ↔ Period
Convert between frequency, wavelength, and period with a single input.
Decibel Converter
Convert power ratios into decibels for audio and RF engineering.
Projectile Motion Simulator
Model projectile flight path, range, and peak altitude in real-time.
Molar Mass Calculator
Compute molar mass from chemical formulas including nested groups.