Network Technician Tools
Three client-side utility calculators for daily networking tasks: RF power conversion, IPv4 CIDR subnetting, and Fresnel zone clearance.
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1. dBm to mW Power Converter
Formula: mW = 10^(dBm / 10) | Inverse: dBm = 10 * log10(mW)
Presets:
Conducted power output: 0.100 W
EIRP Parameters (Effective Isotropic Radiated Power)
e.g. SXT 16 dBi, LHG 24.5 dBi
RF jumper losses
Total Calculated EIRP
35.0 dBm
Equivalent Radiated Power
3.16 Watts (3,162 mW)
| dBm | Milliwatts | Watts | Typical Practical Use |
|---|---|---|---|
| 0 dBm | 1.00 mW | 0.001 W | Reference benchmark |
| 14 dBm | 25.12 mW | 0.025 W | Handheld mobile device Wi-Fi |
| 20 dBm | 100.00 mW | 0.100 W | Standard indoor AP EIRP (CE limit) |
| 23 dBm | 199.53 mW | 0.200 W | 5 GHz UNII-1 standard ceiling AP |
| 27 dBm | 501.19 mW | 0.501 W | Outdoor wireless bridge radio |
| 30 dBm | 1,000.00 mW | 1.000 W | 1 Watt high-power transmitter |
2. IPv4 CIDR Subnet Calculator
Bitwise IPv4 subnetting with RFC 3021 /31 Point-to-Point link support.
Type an IP or combination like 10.0.0.1/24
Shortcuts:
Network Address
192.168.88.0 /24
Broadcast Address
192.168.88.255
Usable Host Range
192.168.88.1 – 192.168.88.254
Total Usable Hosts
254
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
Address Scope:
Private (RFC 1918 Class C)
3. Fresnel Zone Clearance Calculator
Formula: r = 17.32 * sqrt((d1 * d2) / (f * D))
In outdoor point-to-point wireless links, optical line of sight is not enough. Trees, buildings, or the earth's curvature entering the first Fresnel zone will cause multipath phase cancellation and link dropouts. At least 60% of the radius (r) must remain completely unobstructed.
Distance from transmitter to obstacle (km)
Distance from obstacle to receiver (km)
Total Link Distance (D = d1 + d2): 5.00 km
1st Fresnel Zone Radius (r)
8.02 m
Full 100% radius in meters
60% Minimum Clearance (0.6 * r)
4.81 m
Obstacle must stay below/outside this height
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Rule of thumb: The widest point of the Fresnel ellipse occurs at midpoint (
d1 = d2). Higher frequencies (like 60 GHz) produce significantly tighter Fresnel zones than lower frequencies (like 2.4 GHz), requiring less ground clearance.