TechCalcs - Engineering & Physics Calculators

Calculation tools for engineers.

TechCalcs is a free collection of calculation tools built for engineers and students. From engine displacement and torque calculations to number base conversion and Unix timestamp conversion — all tools run entirely in your browser, with no registration or installation required.

Mechanical & Electrical

Engine Displacement CalculatorCalculate engine displacement in cc/L from bore, stroke, and number of cylinders.Torque / Power / RPM CalculatorConvert between torque, power, and RPM with built-in unit converters.Gear Ratio & Spur GearSpur gear design tool for gear ratio, pitch circle diameter, center distance, and force analysis

Electronics

Resistor Color Code CalculatorRead resistor values and tolerances from color band codes.LED Resistor CalculatorCalculate the current-limiting resistor for LED circuits in real time.Ohm's Law CalculatorFind V, I, or R from two known values

Programming & IT

Number Base ConverterConvert between binary, octal, decimal, and hexadecimal in real time.Unix Timestamp ConverterBidirectional real-time conversion between Unix timestamps and human-readable dates.Base64 ConverterEncode and decode text or binary data in Base64 format.

Why TechCalcs?

Free & No Sign-up Required

All tools are completely free to use. No account registration or installation needed.

Built for Engineers & Students

Covering electronics, mechanical engineering, computer science, and mathematics.

Works on Any Device

Fully responsive design — use comfortably on smartphones, tablets, and desktops.