Tools
All tools
Every calculator on the site, grouped by topic. Pick the one you need and go. Each is free, runs in your browser, and needs no signup.
Homelab
RAID / ZFS / unRAID Storage Calculator Usable capacity, fault tolerance, and cost per TB across RAID 0/1/5/6/10, RAIDZ1/2/3, and unRAID. RAIDZ Calculator ZFS RAIDZ1/2/3 usable space, fault tolerance, and the real figure after ZFS padding and slop. SHR Calculator Synology SHR-1 and SHR-2 usable space from mixed drive sizes, plus the figure DSM actually reports. unRAID Calculator unRAID usable space with one or two parity disks and any mix of drive sizes, each disk kept full. RAIDZ Expansion Calculator Adding a drive to a RAIDZ vdev (OpenZFS 2.3+)? See the real usable space right after expanding, why it is less than the naive math, and what rewriting old data reclaims. Homelab Power & Electricity Cost Calculator Add your always-on devices, set your kWh rate, and see daily, monthly, and yearly electricity cost with a per-device breakdown. UPS Runtime & Sizing Calculator Estimate how long your UPS will run your gear, or work out what size UPS and battery you need for a target runtime. Subnet / CIDR Calculator Enter a network like 192.168.1.0/24 to get the mask, wildcard, network and broadcast, usable host range, host count, and split it into smaller subnets. Self-Hosting vs SaaS Cost Calculator Compare the real cost of self-hosting an app against the subscription. Enter the monthly fee, your hardware and power or a VPS, and get the break-even point and total over time.
3D printing
Filament Drying Calculator Manufacturer drying temperatures per filament (shown when they disagree, never averaged), your dryer graded against the range including measured real-world max temps, a weight-based dryness check, mixed-batch run planning, and how long a dried spool lasts in your air. 3D Print Cost Calculator Enter filament, print time, and your rates to get the true per-print cost: material, power, machine wear, and failed prints.