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.

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Series & Parallel Resistor Calculator

Compute equivalent resistance for series and parallel resistor networks.

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Resistor Color Code Decoder

Translate resistor color bands into resistance values and tolerances.

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LED Resistor Calculator

Determine the ideal series resistor for safely driving LEDs.

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Reactance Calculator

Calculate capacitive or inductive reactance at any frequency.

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RC & RL Time Constant

Find the time constant for RC and RL circuits instantly.

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Frequency ↔ Wavelength ↔ Period

Convert between frequency, wavelength, and period with a single input.

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Decibel Converter

Convert power ratios into decibels for audio and RF engineering.

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Projectile Motion Simulator

Model projectile flight path, range, and peak altitude in real-time.

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Molar Mass Calculator

Compute molar mass from chemical formulas including nested groups.

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