RF Cafe Espresso Engineering Workbook™
Current version is 5.21.2026 - check back often for updates

RF Cafe's spreadsheet-based engineering and science calculator, Espresso Engineering Workbook™ (click to download), is a collection of electrical engineering and physics calculators for commonly needed design and problem solving work. The filter calculators do not just amplitude, but also phase and group delay (hard to get outside of a big $$$ simulator). It is an excellent tool for engineers, technicians, hobbyists, and students. Equally excellent is that Espresso Engineering Workbook™ is provided at no cost, compliments of my generous sponsors. 50 worksheets to date.

Beginning with v4.20.2025, a floating window that conveniently lists all the worksheet pages. Just click on a page name to go there. There is a button on the Home page to display all the bottom tabs with page names. Please visit my advertisers to see what they can offer to support your projects.

All of the original calculators from years ago are included, but with a vastly expanded and improved user interface. Error-trapped user input cells help prevent entry of invalid values. An extensive use of Visual Basic for Applications (VBA*) functions now do most of the heavy lifting with calculations, and facilitates a wide user-selectable choice of units for voltage, frequency, speed, temperature, power, wavelength, weight, etc. In fact, a full page of units conversion calculators is included. A particularly handy feature is the ability to specify the the number of significant digits to display. Drop-down menus are provided for convenience.

I been adding new calculators on a regular basis.

For the time being, the VBA code is password protected. At some point, a version might be made available with full access, but during the development stage, I prefer to not expose all my hard work for easy poaching.

A lot of effort has been expended validating calculations, including references from books, magazines, and other software. As always, you are advised to check results against other sources if something seems off. If you do find an error, please report it to me ASAP so it can be corrected with the next release.

The file is in an xlsx format compatible back to Excel 2007 - and it may work for even earlier versions.

In appreciation for RF Cafe's sponsors, hyperlinked thumbnails to their websites are included on the homepage.

* Note: Because VBA code is used, you must allow Excel security to enable macros.

This edition includes the following calculators:

• Attenuator Calculator
• Butterworth Filter Calculator
• Butterworth Bandpass Filter Calculator (G,θ,τ_d)
• Butterworth Highpass Filter Calculator (G,θ,τ_d)
• Butterworth Lowpass Filter Calculator (G,θ,τ_d)
• Capacitance Calculator
• Cascaded System Calculator
• Coaxial Cable Calculator
• Chebyshev Type 1 Filter Calculator
• Complex Number Calculator
• Component Scaling Calculator
• Delta-Wye Calculator
• Directional Coupler Calculator
• Doppler Shift Calculator
• Filter Calculator
• FM Sidebands Calculator
• FM Modulation Calculator
• Frequency Conversion Calculator
• Frequency Planner
• Fresnel Zone Calculator
• Helical Resonator Calculator
• Microstrip & Stripline Calculator
• Morse Code Translator
• Noise Figure Calculator
• Near Field Calculator
• Ohm's Law Calculator
• Opamp Calculator
• 1-Way Path Loss Calculator
• 2-Way Path Loss Calculator
• Phase Noise Calculator
• Power FactorCCalculator
• RF Energy ν, λ, τ Calculator Calculator
• Radar Blind Speed Calculator
• Radar Horizon Calculator
• Rectangular Cavity Resonance Calculator
• RLC Combinations Calculator
• Skin Depth Calculator
• Sound Energy ν, λ, τ Calculator Calculator
• Spurious Product (Mixer) Calculator
• Statistics Calculator
• Surface Areas & Volumes Calculator
• Units Conversion Calculators
• Time Constants Calculators
• Transformer Calculator
• Voltage Divider Calculator
• VSWR | Return Loss | Gamma Calculator
• Voltage Conversion Calculator
• Wheatstone Bridge Calculator