Free tools
Useful network calculations, ready when you are.
Solve the small network-engineering questions that come up every day. These tools run entirely in your browser, require no account, and do not bind your work to a project.
Calculate
Free calculators for real network work.
From subnetting and address representation to link budgets and power, each calculator shows the reasoning behind the result and works offline after the page loads.
IPv6 calculator
Expand and compress addresses, derive prefixes, count /64s, and build an EUI-64 identifier from a MAC.
Binary converter
IPv4 in dotted binary, hexadecimal and decimal, with the prefix boundary marked.
CIDR aggregation
Collapse a list of prefixes into the smallest equivalent set, or summarise into one route.
Bandwidth calculator
Transfer time with protocol overhead, and the bandwidth-delay product that caps TCP throughput.
MTU calculator
Stack encapsulation overheads to find the effective path MTU and the TCP MSS to clamp to.
PoE calculator
Budget switch power against device draw, accounting for cable loss between PSE and PD.
Fiber distance calculator
Optical power budget, per-element losses and the maximum run that still closes with margin.
Wireless link budget
Free-space path loss, EIRP, fade margin and the Fresnel clearance a link needs to behave.
Subnet calculator
IPv4 network, broadcast, usable range and mask, plus block sizing for a host count.
Every figure here is computed from first principles rather than looked up in a table, and the underlying functions are covered by tests — including edge cases like /31 point-to-point links, IPv6 zero-run compression, and decimal versus binary size units.
Keep the context
When a calculation becomes a project, NetField keeps it connected.
Turn a standalone answer into a reviewable network plan with addressing, devices, configuration and documentation in one workspace.