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.

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.