Technology calculators
Subnets, download times, bandwidth, and rack power. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- Bandwidth CalculatorRight-size your internet plan: users times per-user demand for browsing, calls, or streaming, plus 20% protocol overhead and a headroom target, in Mbps.→
- Download Time CalculatorSee how long a download really takes: file size in MB, GB, or TB divided by your effective speed after protocol overhead, broken into hours, minutes, seconds.→
- IP Subnet CalculatorEnter an IPv4 address and CIDR prefix to get the network and broadcast addresses, usable host range, subnet mask, wildcard mask, and private or public scope.→
- Server Power CalculatorEstimate data-center electricity costs: server count, watts, utilization, and PUE give facility kilowatts, annual kWh, cooling tons, and the yearly bill.→
How this manual is organized
Each entry above opens a one-page tool: inputs on the left, the live result on its color board, and beneath the card the formula with worked examples and the method's limits. Save the tools you use often — they'll wait on this shelf next visit.