Andy Foad (G0FTD) has made a collection of RF calculations available in an online Google spreadsheet.

Amongst the calculations are:

• RF Loss though concrete
• Barometric pressure conversions
• Maidenhead distance and beam heading calculator
• Audio filters (RC networks)
• Unknown feeder impedance calculator
• Loop antenna impedance calculator
• FM bandwidth (Carson's rule) now includes modulation index.
• L network matching component values<
• Capacitive and inductive reactances
• Bandwidth tuned circuit
• Radio range and VHF/UHF/Microwave
• Freespace path loss
• Resonance series tuned circuit
• Resonance // tuned circuit
• Power received from tx to rx
• Groundwave range calculation
• Near field (REACTIVE) region of an antenna
• Calculation of skin effect on conductors (2 methods)
• Series Resistance calculator for LED's, Lamps and crude nicad charging
• Impedance calculator including phase and power factor and relative SWR.
• Quarter wave transformer calculator
• Electrical quarter wave calculator
• Impedance of custom air spaced coax
• Air spaced capacitor designer
• All of Ohms law and power laws
• Conversion of AC and DC values RMS etc
• Conversion of milliwatts to dbm
• Conversion of dbuV to dbm
• Amidon cores inductance designer and related info included.
• Power and voltage decibel ratio's.
• Coax losses and approx capacity per 30cm
• Coax voltage breakdown and capacity per foot
• Single layer air cored inductance designer
• Capacitor markings guide
• SPARK GAP DISTANCES
• Resonant speaker tubes to act as CW peak filters
• db versus multiplication factor both power and voltage
• Galactic noise levels
• uV to dbm converter
  
• Milliwatts to dbm converter
  

You can download the spreadsheets from https://sites.google.com/site/g0ftdradio/home/rf-spreadsheets