Online Server Rack Builder for Custom Designs
RackBuilder is a free online server rack builder and server rack designer for IT teams. Sketch a custom elevation in the browser, check U space and device fit, then review the layout before install day.
Ready to place devices in a live elevation?
What this server rack builder does
The builder turns catalog devices into a visual rack elevation. You pick a rack height, drag network and server devices into position, and see U conflicts as you work. That makes it a practical custom server rack builder for closets, IDFs, and small data rooms, not just a static diagram.
- Place switches, servers, patch panels, PDUs, and cable managers by U.
- Validate height and spacing before you buy or re-rack gear.
- See per-device wattage from the catalog while you place gear.
- Start online without an account, then save designs when you sign in.
How to plan a rack by U height
Rack units (U) are the shared currency of every server rack designer workflow. Inventory each device height first, then choose a cabinet (12U, 24U, 42U, or another size) with spare capacity. Leave U for horizontal managers near dense switches, and avoid packing the top and bottom so tightly that airflow or service access suffers.
A useful sequence: list devices and U, note power draw and weight from manufacturer specs, place heavy gear lower, group patch panels with the switches they feed, then reserve growth slots. Walk through the U layout in the online designer so contested slots show up before hardware arrives. For deeper spacing rules, see U-space best practices.
Power and weight considerations
Custom layouts fail in the field when circuits or load ratings are ignored. Use nameplate or measured wattage for every chassis, match PDU amperage and receptacle types, and keep headroom for boot spikes. The designer shows catalog wattage where available so you can cross-check while you place devices. If you need redundancy, plan dual feeds and the U those PDUs consume.
Weight is planning advice you check outside the tool: RackBuilder does not store chassis weights. Sum device and rail weights from vendor datasheets, compare them to the rack load rating and floor limits, and keep the center of gravity low. UPS and dense servers belong toward the bottom; lighter patching and managers can sit higher.
When to use a custom online build
Use an online server rack builder when you are refreshing a closet, consolidating switches, adding a UPS, or quoting a new cabinet. A visual custom server rack builder catches U-fit issues early: a 2U manager you forgot, overlapping devices, or a 42U elevation that is already full at 38U of planned gear.
Pair the tool with a short checklist from our network rack design guide and rack types comparison, then lock the elevation in RackBuilder.
Frequently asked questions
What is an online server rack builder?
An online server rack builder is a browser tool that lets you place real network and server devices into a virtual rack elevation. RackBuilder shows U height, conflicts, and layout so you can validate a custom design before you order hardware or schedule an install.
How do I plan a rack by U height?
Start with the total U available (for example 24U or 42U), list every device height, then reserve spare U for growth and cable managers. Place dense switches next to the patch panels they feed, and keep heavy gear lower. Model the elevation in the designer so unused and contested U are obvious.
What power and weight limits should I check?
Sum device wattage against PDU circuit capacity and leave headroom for peaks. Confirm receptacle types and redundant feeds when required. Add chassis weights plus rails, then compare to the rack load rating and floor limits. Weight and power mistakes are harder to fix after gear is mounted.
Is RackBuilder free to use as a custom server rack builder?
Yes. You can open the designer without an account and build a custom server rack layout online. Free plans include saved designs with a limit; Pro unlocks unlimited saved designs when you need more capacity.
Build your rack layout next
Open the free designer and turn this plan into a custom elevation.