更聪明地建造。
工程
100 多个源自 Reddit 的计算器、估算器、验证器和转换器,覆盖电气、机械、土木、流体热力、材料、结构、管道、安全、测绘和工程单位换算。
107 个工具可用
电气
电线、线管、压降和规范计算,为电工、弱电技术员和学徒打造。
机械
梁、电机、液压、齿轮和扭矩,为设计师、技术员和现场工程师打造。
土木
土方、排水、测量和基础尺寸计算,为土木工程师、测量员和场地施工承包商打造。
流体与热力
风管、水管、制冷剂、BTU 和即热式热水器选型,为暖通空调和管道专业人士打造。
材料
石膏板、油漆、砌筑、钢筋、木材和混凝土估算,为施工方、造价员和 DIY 爱好者打造。
工程单位换算
工程专用单位换算:扭矩、应力、流量、粘度、导热系数等。
结构
搁栅、过梁、基础、柱和剪力墙,为木工、露台施工者和结构设计师打造。
管道
管径选型、热水器、排水坡度、存水弯和雨水收集,为管道工和施工方打造。
安全与合规
弧闪、坠落防护、PPE 选择、噪声和受限空间检查,为工地安全专业人员打造。
测绘与 GIS
方位角、导线、面积和 UTM 分带计算,为测量员、制图员和 GIS 分析师打造。
能源与可再生
光伏回本、投资回报率和补贴计算,为权衡屋顶光伏、储能电池和热泵的 r/solar、r/OffGrid、r/RenewableEnergy 用户打造。
Voltage Drop Calculator
Compute the percentage drop across a feeder or branch circuit quickly.
打开工具
Wire Size & Ampacity Sizer
Find the conductor and OCPD size for any continuous load.
打开工具
Conduit Fill Calculator
Validate raceway fill against the 40% rule and Chapter 9 tables.
打开工具
Box Fill Calculator
Size a box to meet NEC 314.16 volume and claw counts.
打开工具
Residential Service Load Calculator
Run a quick NEC 220 standard or optional demand factor.
打开工具
Conductor Derating & Correction
Combine adjuster factors for one final ampacity.
打开工具
Transformer kVA & Buck-Boost Sizer
Pick the right kVA, tap, and configuration for a transformer job.
打开工具
Motor FLA & Feeder Sizing (NEC 430)
Compute FLA, feeder ampacity, and OCPD limits.
打开工具
Low-Voltage Cable Run Calculator
Estimate end-of-run voltage, signal loss, and gauge upgrades.
打开工具
Room Lighting Lumens Calculator
Estimate fixture count and layout for any space.
打开工具
Beam Span & Size Estimator
Quick-check a wood, LVL, or W-shape against deflection.
打开工具
Spread Footing & Pad Sizer
Estimate a square isolated pad for axial and moment loads.
打开工具
Rebar Weight & Length Calculator
Convert bar size, length, and lap into pounds and tons.
打开工具
Stair Stringer Calculator
Lay out rise, run, and stringer length to code.
打开工具
Motor Horsepower Converter
Convert between mechanical, metric, BTU, and electrical HP.
打开工具
Cut/Fill Volume Calculator
Compute net cut and fill volumes with shrink and swell.
打开工具
Traverse Closure & Bowditch Adjust
Compute misclosure and adjusted coordinates.
打开工具
Horizontal & Vertical Curve Solver
Solve PC, PT, and station offsets for any curve.
打开工具
Coordinate Inverse & Forward
Convert between DMS coordinates and azimuth/distance.
打开工具
Slope & Grade Calculator
Express slope in pitch, percent, ratio, and angle.
打开工具
Culvert & Storm Pipe Sizing
Compute design Q and pipe diameter with Manning's equation.
打开工具
Aggregate Tonnage Calculator
Compute cubic yards, tons, and bag counts for any job.
打开工具
Manual J Lite Load Calculator
Estimate room-by-room heating and cooling loads.
打开工具
Duct Sizing & CFM by Friction
Size duct runs from CFM and friction rate.
打开工具
Refrigerant Target Superheat & Subcool
Get the right superheat or subcool target by gas.
打开工具
Furnace & AC BTU Sizing
Match a unit's capacity to the home.
打开工具
Drywall Sheets, Mud & Screws Estimator
Compute drywall sheets, joint compound, tape, and screws.
打开工具
Paint Coverage & Gallon Estimator
Estimate gallons of paint, primer, and prep.
打开工具
Board Feet & Lumber Cost
Compute board feet, cost, and fall-off vs. vendor counts.
打开工具
Linear Feet vs Board Feet Converter
Convert between BF and LF for any nominal size.
打开工具
Compound Miter & Crown Angle Calculator
Get miter and bevel for any crown or picture frame.
打开工具
Wood Shrinkage & Movement Calculator
Estimate dimensional change across moisture content.
打开工具
Stair Stringer Diagram Generator
Visualize the cut layout and printable diagram.
打开工具
Mortar Mix Ratio Calculator
Get Portland, lime, and sand batched by mix type.
打开工具
Brick & CMU Block Counter
Estimate brick, block, mortar, and grout.
打开工具
CMU Grout Volume Calculator
Estimate grout for bonded or unbonded CMU cells.
打开工具
Wall Area & Material Estimator
Compute wall SF net of openings.
打开工具
Simple Bar-Chart Schedule Builder
Lay out a small job's milestone Gantt without MS Project.
打开工具
Ladder Angle & Pitch Safety Checker
Validate a ladder against OSHA 1910.23.
打开工具
Fall Clearance & Anchor Height Calculator
Compute required fall clearance per OSHA.
打开工具
Daily Construction Report Builder
Generate a printable site-log from a daily form.
打开工具
Bid Markup & Margin Calculator
Compute sell price, gross profit, and tax.
打开工具
Labor-Hours Per Task Estimator
Estimate crew days, man-hours, and labor cost.
打开工具
OSHA Stair & Guardrail Compliance Checker
Validate stair dimensions and guardrails against OSHA 1910.
打开工具
Torque Unit Converter
Switch between Nm, lb-ft, kgf-m, and oz-in.
打开工具
Pressure / Stress Converter
Translate Pa, MPa, psi, ksi, bar, and atm.
打开工具
Flow Rate Converter
Switch between CFM, m3/s, GPM, and L/min.
打开工具
Dynamic & Kinematic Viscosity Converter
Convert cP, mPa-s, cSt, and mm2/s.
打开工具
Thermal Conductivity Converter
Translate W/(m K), BTU/(h ft F), and W/(m C).
打开工具
Energy Unit Converter (Engineering)
Convert J, kJ, kWh, BTU, therm, and ft-lb.
打开工具
Panel Load & Sub-Panel Sizer
Tally a panel's connected load and pick the next standard bus rating.
打开工具
Wire DC Resistance Calculator
Compute the ohms and percent drop for any gauge length and material.
打开工具
Raceway Fill by Trade Size & Wires
Size EMT, PVC, and flex by actual cable area and Chapter 9 tables.
打开工具
Solar PV Wire & String Sizer
Compute conductor ampacity and Voc correction for PV arrays.
打开工具
Generator Sizing Calculator
Pick the right standby or jobsite kW for any load list.
打开工具
DC Battery Runtime Estimator
Estimate runtime, depth-of-discharge, and battery bank size.
打开工具
Gear Ratio & Output RPM
Compute gear train ratios, output RPM, and torque multiplication.
打开工具
ASME Shaft Diameter Sizer
Estimate a shaft diameter from torque and material allowable.
打开工具
Screw Jack Mechanical Advantage
MA, velocity ratio, and efficiency for a screw jack.
打开工具
Two-Pulley RPM & Speed Ratio
Match driver to driven pulley by RPM, diameter, and belt length.
打开工具
Spring Rate (k) Calculator
Size a compression or tension spring from load and deflection.
打开工具
Open Channel Flow & Manning Velocity
Compute uniform flow for a ditch, swale, or channel cross-section.
打开工具
Catch Basin & Inlet Sizing
Sump and grate capacity check against design Q.
打开工具
Riprap & Outlet Protection Sizing
Stabilize a culvert outlet with the right stone size.
打开工具
Shrink & Swell Bank-to-Compacted Cubic Yards
Convert bank yards to compacted or loose yards using shrink/swell factors.
打开工具
Stormwater Detention Volume
Size a detention basin for pre- vs. post-development runoff.
打开工具
True ↔ Magnetic Bearing Converter
Convert true azimuth to magnetic with local declination.
打开工具
Pipe Schedule ID/OD Lookup
Find inside diameter, wall thickness, and weight per foot for any schedule.
打开工具
Boiler Heat Load by EDR
Convert EDR (sq ft) into MBH for steam or hot-water boilers.
打开工具
Chilled Water Pipe Sizing
Pick a chilled water pipe by GPM and ΔT with velocity caps.
打开工具
Closed-Loop Expansion Tank Sizing
Pick a diaphragm expansion tank for a hydronic or hot-water loop.
打开工具
Natural Gas Pipe Sizing (BTU)
Match gas pipe length and BTU load to the right nominal size.
打开工具
Concrete Bag Count Calculator
Count 60-lb, 80-lb, or bag-calculator-ready mixes for any pour.
打开工具
Stucco & Plaster Coverage Estimator
Coverage, bags, and labor for scratch, brown, and finish coats.
打开工具
Roof Shingle Squares Estimator
Count shingle squares, starter, ridge cap, and felt underlayment.
打开工具
Ceiling Tile & Grid Estimator
Count 2x2 / 2x4 tiles, grid mains, tees, and wire.
打开工具
Fence Material Estimator
Posts, rails, pickets, concrete, and gates for any fence run.
打开工具
AWG ↔ mm² Wire Gauge Converter
Convert AWG / kcmil to metric mm² cross-section and diameter.
打开工具
Hardness Scale Converter (HRC/HB/HV)
Approximate cross-scale conversions between Rockwell, Brinell, and Vickers.
打开工具
Frequency ↔ Wavelength Converter
Convert Hz to wavelength in vacuum, air, or with speed-of-sound.
打开工具
Specific Heat Capacity Converter
Convert J/(kg·K), BTU/(lb·°F), and cal/(g·°C).
打开工具
Floor & Ceiling Joist Span Estimator
Quick-check a wood joist or TJI against span tables.
打开工具
Door / Window Header Beam Sizer
Estimate a header for a door or window opening in a bearing wall.
打开工具
Deck Post & Footing Sizer
Sizing for deck posts, footings, and beam spans per IRC.
打开工具
Euler Column Buckling Load
Compute critical buckling load for a fixed/pinned steel or wood column.
打开工具
Shear Wall Line Length & Capacity
Estimate required shear wall length for a given wind or seismic story shear.
打开工具
Tank Water Heater Sizing by Household
Pick a tank size (gal) for a family of 1–6.
打开工具
Pipe Flow Velocity & Friction Loss
Solve velocity and Hazen-Williams head loss for any diameter.
打开工具
Floor Drain Trap Primer Frequency
Compute primer valve cycles/day to keep P-traps wet.
打开工具
Rainwater Harvesting Tank Sizer
Size a cistern from roof catchment area and local rainfall.
打开工具
Restaurant Grease Trap Sizer
Pick a grease trap by fixture count and flow rate.
打开工具
Arc Flash Boundary (IEEE 1584)
Compute incident energy and arc flash boundary distance.
打开工具
Confined Space Air Monitoring Limits
O2, LEL, CO, and H2S atmospheric alarm criteria.
打开工具
Lockout / Tagout (LOTO) Procedure Builder
Generate a printable LOTO isolation procedure.
打开工具
Noise Dose & TWA Calculator (OSHA / NIOSH)
Compute 8-hour time-weighted average and % dose.
打开工具
PPE Category 0–4 Selector (NFPA 70E)
Pick the NFPA 70E PPE category for any arc flash task.
打开工具
Bearing (NE/NW/SE/SW) ↔ Azimuth Converter
Convert quadrant bearings to azimuth decimal degrees and back.
打开工具
Bowditch / Compass Rule Adjust
Distribute a traverse misclosure by distance.
打开工具
UTA / Coordinate Area Calculator
Compute planar area of an ordered lat/lon or N/E polygon.
打开工具
UTM Zone Lookup by Longitude
Find the UTM zone, central meridian, and convergence for any longitude.
打开工具
Resistor Color-Band Decoder
Read a 4-band or 5-band resistor color code into ohms, with tolerance and ppm/K.
打开工具
Solar Payback & ROI
Estimate the payback period, lifetime savings, and IRR of a rooftop solar install.
打开工具
Wall Framing Spec Check
Validate a stud-and-plate wall against common code spans.
打开工具
服务器机房 BTU / UPS 选型
为小型服务器机房选型冷量与 UPS 负载。
打开工具
Windows 自定义 ISO / WIM 尺寸
估算自定义 Windows 安装镜像的最终 .iso 大小。
打开工具
IPv6 子网分配
从 /N 委派中确定子前缀。
打开工具
3-2-1 云备份 TCO
估算 3-2-1 备份方案的月度成本。
打开工具