Free Garage Calculators and Planning Tools

Every Garage Playbook tool is free, runs entirely in your browser, shows its working and never saves what you type. The tools use your own measurements and product labels, and recommend sizes and types, never brands, so an affiliate commission can never shape a result.

Planning

• Garage Makeover Plan Builder

  Six questions, one personalised step-by-step garage plan in the right order, with the right tools and guides.

• Garage Parking Fit Checker

  Will your vehicles fit with room to open doors? Check width, depth and door clearance.

Heating and Cooling

• Garage Heater Size Calculator

  Heat loss from your walls, ceiling, door and drafts, converted to BTU, watts and 240-volt amps.

• Garage Ventilation Calculator

  Exhaust airflow in CFM from your garage volume and target air changes.

Floors

• Epoxy Floor Coverage Calculator

  Gallons, kits and flakes for epoxy, polyaspartic or floor paint from your floor size and label coverage.

• Garage Floor Tile Calculator

  Interlocking tiles, edge ramps and boxes for your garage floor.

Workshop

• Garage Lighting Calculator

  Lumens and fixtures for your garage using the lumen method and your own brightness target.

• Air Compressor CFM Calculator

  The delivered CFM at 90 PSI your air tools need, with a margin.

Doors and Openers

• Garage Door Opener Selector

  Chain, belt or wall-mount: which opener type and features usually fit your door and home.

• Garage Safety and Maintenance Checklist

  A printable checklist for door safety, fire and air safety, storage and seasonal care.

Storage

• Garage Shelving Load Calculator

  Total what you store and check it against your shelving rating with a safety margin.

• Overhead Storage Clearance Calculator

  Check a ceiling rack against your vehicle, the open door and the opener.

Projects

• Garage Conversion Budget Planner

  Total your conversion quotes with a contingency and see where the money goes.

How our calculators work

Each tool lists its assumptions, explains every step of the math and links to the guides behind it. Physical formulas, such as heat loss through a wall or airflow from air changes per hour, are standard engineering relationships. Product numbers, such as coverage per gallon or a fan’s CFM rating, come from your own labels and manuals, because they vary from product to product.

Have an idea for a tool? Tell us.