Redmoon Converters 使用简化版Manual J算法，根据面积、层高、隔热性能、气候区、日照情况和居住人数，为任意房间选配空调、热泵或暖气设备。
| 组成部分 | BTU/hr |
|---|
简化版 Manual-J 经验公式： 基础值20 BTU/平方英尺 × 面积 × 隔热系数 × 气候系数 × 日照系数，并按层高（相对8英尺/2.4米）调整。
然后每位使用者加600 BTU，若该空间是厨房则再加4000 BTU（用于抵消电器负荷）。
制冷吨： 1制冷吨 = 12000 BTU/小时。 千瓦（热泵输出）： BTU/小时 ÷ 3412。
最终选型前请务必请合格的暖通空调技师进行正式的 Manual-J 负荷计算——本工具仅供初步估算参考。
Concrete Volume & Bags Calculator
Cubic yards / metres of concrete needed for slabs, footings, columns and posts, plus bags-of-mix conversion.
Paint Coverage Calculator (Litres / Gallons)
Litres or gallons of paint needed by wall area, coats, primer and surface texture coverage.
Lumber Board Feet & Cost Calculator
Calculate board feet, linear feet and total cost for hardwood and softwood lumber.
Tile & Flooring Coverage Calculator
Tiles or boxes needed for any floor or wall area, with pattern waste and grout lines.
MIG Welding Settings Calculator (Amps, Volts, Wire Speed)
Recommended MIG welding voltage, amperage and wire feed speed by metal thickness, wire diameter and material.
Landscaping Material Calculator (Gravel, Mulch, Soil, Sand)
Cubic yards, weight, bags and cost of gravel, mulch, topsoil or sand needed for any area and depth.