더 똑똑하게 짓다.
엔지니어링
전기, 기계, 토목, 유체·열, 재료, 구조, 배관, 안전, 측량, 공학 단위 변환까지 — 레딧에서 발굴한 100개 이상의 계산기, 견적 도구, 검증기, 변환기.
107개 도구 이용 가능
전기
전선, 전선관, 전압 강하, 규정 계산 — 전기공, 약전 기술자, 견습생을 위해.
기계
보, 모터, 유압, 기어, 토크 — 설계자, 기술자, 현장 엔지니어를 위해.
토목
토공, 배수, 측량, 기초 치수 산정 — 토목 엔지니어, 측량사, 부지 공사 업체를 위해.
유체·열
덕트, 배관, 냉매, BTU, 순간온수기 용량 산정 — 공조·배관 전문가를 위해.
재료
석고보드, 페인트, 조적, 철근, 목재, 콘크리트 견적 — 시공자, 견적 담당자, DIY족을 위해.
공학 단위 변환
토크, 응력, 유량, 점도, 열전도율 등 엔지니어링 전용 단위 변환.
구조
장선, 인방보, 기초, 기둥, 전단벽 — 목수, 데크 시공자, 구조 설계자를 위해.
배관
배관 치수, 온수기, 배수 구배, 트랩, 빗물 활용 — 배관공과 시공자를 위해.
안전·규정
아크플래시, 추락 방지, 보호구 선택, 소음, 밀폐 공간 점검 — 현장 안전 전문가를 위해.
측량·GIS
방위각, 트래버스, 면적, UTM 존 계산 — 측량사, 지도 제작자, GIS 분석가를 위해.
에너지·재생에너지
태양광 회수 기간, ROI, 보조금 계산 — 지붕형 태양광, 배터리, 히트펌프를 고민하는 r/solar, r/OffGrid, r/RenewableEnergy 사용자들을 위해.
Voltage Drop Calculator
Compute the percentage drop across a feeder or branch circuit quickly.
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Wire Size & Ampacity Sizer
Find the conductor and OCPD size for any continuous load.
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Conduit Fill Calculator
Validate raceway fill against the 40% rule and Chapter 9 tables.
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Box Fill Calculator
Size a box to meet NEC 314.16 volume and claw counts.
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Residential Service Load Calculator
Run a quick NEC 220 standard or optional demand factor.
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Conductor Derating & Correction
Combine adjuster factors for one final ampacity.
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Transformer kVA & Buck-Boost Sizer
Pick the right kVA, tap, and configuration for a transformer job.
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Motor FLA & Feeder Sizing (NEC 430)
Compute FLA, feeder ampacity, and OCPD limits.
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Low-Voltage Cable Run Calculator
Estimate end-of-run voltage, signal loss, and gauge upgrades.
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Room Lighting Lumens Calculator
Estimate fixture count and layout for any space.
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Beam Span & Size Estimator
Quick-check a wood, LVL, or W-shape against deflection.
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Spread Footing & Pad Sizer
Estimate a square isolated pad for axial and moment loads.
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Rebar Weight & Length Calculator
Convert bar size, length, and lap into pounds and tons.
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Stair Stringer Calculator
Lay out rise, run, and stringer length to code.
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Motor Horsepower Converter
Convert between mechanical, metric, BTU, and electrical HP.
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Cut/Fill Volume Calculator
Compute net cut and fill volumes with shrink and swell.
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Traverse Closure & Bowditch Adjust
Compute misclosure and adjusted coordinates.
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Horizontal & Vertical Curve Solver
Solve PC, PT, and station offsets for any curve.
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Coordinate Inverse & Forward
Convert between DMS coordinates and azimuth/distance.
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Slope & Grade Calculator
Express slope in pitch, percent, ratio, and angle.
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Culvert & Storm Pipe Sizing
Compute design Q and pipe diameter with Manning's equation.
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Aggregate Tonnage Calculator
Compute cubic yards, tons, and bag counts for any job.
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Manual J Lite Load Calculator
Estimate room-by-room heating and cooling loads.
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Duct Sizing & CFM by Friction
Size duct runs from CFM and friction rate.
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Refrigerant Target Superheat & Subcool
Get the right superheat or subcool target by gas.
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Furnace & AC BTU Sizing
Match a unit's capacity to the home.
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Drywall Sheets, Mud & Screws Estimator
Compute drywall sheets, joint compound, tape, and screws.
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Paint Coverage & Gallon Estimator
Estimate gallons of paint, primer, and prep.
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Board Feet & Lumber Cost
Compute board feet, cost, and fall-off vs. vendor counts.
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Linear Feet vs Board Feet Converter
Convert between BF and LF for any nominal size.
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Compound Miter & Crown Angle Calculator
Get miter and bevel for any crown or picture frame.
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Wood Shrinkage & Movement Calculator
Estimate dimensional change across moisture content.
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Stair Stringer Diagram Generator
Visualize the cut layout and printable diagram.
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Mortar Mix Ratio Calculator
Get Portland, lime, and sand batched by mix type.
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Brick & CMU Block Counter
Estimate brick, block, mortar, and grout.
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CMU Grout Volume Calculator
Estimate grout for bonded or unbonded CMU cells.
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Wall Area & Material Estimator
Compute wall SF net of openings.
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Simple Bar-Chart Schedule Builder
Lay out a small job's milestone Gantt without MS Project.
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Ladder Angle & Pitch Safety Checker
Validate a ladder against OSHA 1910.23.
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Fall Clearance & Anchor Height Calculator
Compute required fall clearance per OSHA.
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Daily Construction Report Builder
Generate a printable site-log from a daily form.
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Bid Markup & Margin Calculator
Compute sell price, gross profit, and tax.
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Labor-Hours Per Task Estimator
Estimate crew days, man-hours, and labor cost.
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OSHA Stair & Guardrail Compliance Checker
Validate stair dimensions and guardrails against OSHA 1910.
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Torque Unit Converter
Switch between Nm, lb-ft, kgf-m, and oz-in.
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Pressure / Stress Converter
Translate Pa, MPa, psi, ksi, bar, and atm.
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Flow Rate Converter
Switch between CFM, m3/s, GPM, and L/min.
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Dynamic & Kinematic Viscosity Converter
Convert cP, mPa-s, cSt, and mm2/s.
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Thermal Conductivity Converter
Translate W/(m K), BTU/(h ft F), and W/(m C).
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Energy Unit Converter (Engineering)
Convert J, kJ, kWh, BTU, therm, and ft-lb.
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Panel Load & Sub-Panel Sizer
Tally a panel's connected load and pick the next standard bus rating.
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Wire DC Resistance Calculator
Compute the ohms and percent drop for any gauge length and material.
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Raceway Fill by Trade Size & Wires
Size EMT, PVC, and flex by actual cable area and Chapter 9 tables.
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Solar PV Wire & String Sizer
Compute conductor ampacity and Voc correction for PV arrays.
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Generator Sizing Calculator
Pick the right standby or jobsite kW for any load list.
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DC Battery Runtime Estimator
Estimate runtime, depth-of-discharge, and battery bank size.
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Gear Ratio & Output RPM
Compute gear train ratios, output RPM, and torque multiplication.
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ASME Shaft Diameter Sizer
Estimate a shaft diameter from torque and material allowable.
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Screw Jack Mechanical Advantage
MA, velocity ratio, and efficiency for a screw jack.
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Two-Pulley RPM & Speed Ratio
Match driver to driven pulley by RPM, diameter, and belt length.
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Spring Rate (k) Calculator
Size a compression or tension spring from load and deflection.
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Open Channel Flow & Manning Velocity
Compute uniform flow for a ditch, swale, or channel cross-section.
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Catch Basin & Inlet Sizing
Sump and grate capacity check against design Q.
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Riprap & Outlet Protection Sizing
Stabilize a culvert outlet with the right stone size.
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Shrink & Swell Bank-to-Compacted Cubic Yards
Convert bank yards to compacted or loose yards using shrink/swell factors.
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Stormwater Detention Volume
Size a detention basin for pre- vs. post-development runoff.
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True ↔ Magnetic Bearing Converter
Convert true azimuth to magnetic with local declination.
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Pipe Schedule ID/OD Lookup
Find inside diameter, wall thickness, and weight per foot for any schedule.
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Boiler Heat Load by EDR
Convert EDR (sq ft) into MBH for steam or hot-water boilers.
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Chilled Water Pipe Sizing
Pick a chilled water pipe by GPM and ΔT with velocity caps.
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Closed-Loop Expansion Tank Sizing
Pick a diaphragm expansion tank for a hydronic or hot-water loop.
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Natural Gas Pipe Sizing (BTU)
Match gas pipe length and BTU load to the right nominal size.
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Concrete Bag Count Calculator
Count 60-lb, 80-lb, or bag-calculator-ready mixes for any pour.
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Stucco & Plaster Coverage Estimator
Coverage, bags, and labor for scratch, brown, and finish coats.
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Roof Shingle Squares Estimator
Count shingle squares, starter, ridge cap, and felt underlayment.
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Ceiling Tile & Grid Estimator
Count 2x2 / 2x4 tiles, grid mains, tees, and wire.
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Fence Material Estimator
Posts, rails, pickets, concrete, and gates for any fence run.
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AWG ↔ mm² Wire Gauge Converter
Convert AWG / kcmil to metric mm² cross-section and diameter.
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Hardness Scale Converter (HRC/HB/HV)
Approximate cross-scale conversions between Rockwell, Brinell, and Vickers.
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Frequency ↔ Wavelength Converter
Convert Hz to wavelength in vacuum, air, or with speed-of-sound.
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Specific Heat Capacity Converter
Convert J/(kg·K), BTU/(lb·°F), and cal/(g·°C).
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Floor & Ceiling Joist Span Estimator
Quick-check a wood joist or TJI against span tables.
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Door / Window Header Beam Sizer
Estimate a header for a door or window opening in a bearing wall.
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Deck Post & Footing Sizer
Sizing for deck posts, footings, and beam spans per IRC.
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Euler Column Buckling Load
Compute critical buckling load for a fixed/pinned steel or wood column.
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Shear Wall Line Length & Capacity
Estimate required shear wall length for a given wind or seismic story shear.
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Tank Water Heater Sizing by Household
Pick a tank size (gal) for a family of 1–6.
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Pipe Flow Velocity & Friction Loss
Solve velocity and Hazen-Williams head loss for any diameter.
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Floor Drain Trap Primer Frequency
Compute primer valve cycles/day to keep P-traps wet.
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Rainwater Harvesting Tank Sizer
Size a cistern from roof catchment area and local rainfall.
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Restaurant Grease Trap Sizer
Pick a grease trap by fixture count and flow rate.
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Arc Flash Boundary (IEEE 1584)
Compute incident energy and arc flash boundary distance.
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Confined Space Air Monitoring Limits
O2, LEL, CO, and H2S atmospheric alarm criteria.
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Lockout / Tagout (LOTO) Procedure Builder
Generate a printable LOTO isolation procedure.
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Noise Dose & TWA Calculator (OSHA / NIOSH)
Compute 8-hour time-weighted average and % dose.
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PPE Category 0–4 Selector (NFPA 70E)
Pick the NFPA 70E PPE category for any arc flash task.
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Bearing (NE/NW/SE/SW) ↔ Azimuth Converter
Convert quadrant bearings to azimuth decimal degrees and back.
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Bowditch / Compass Rule Adjust
Distribute a traverse misclosure by distance.
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UTA / Coordinate Area Calculator
Compute planar area of an ordered lat/lon or N/E polygon.
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UTM Zone Lookup by Longitude
Find the UTM zone, central meridian, and convergence for any longitude.
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Resistor Color-Band Decoder
Read a 4-band or 5-band resistor color code into ohms, with tolerance and ppm/K.
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Solar Payback & ROI
Estimate the payback period, lifetime savings, and IRR of a rooftop solar install.
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Wall Framing Spec Check
Validate a stud-and-plate wall against common code spans.
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서버실 BTU / UPS 사이징
소형 서버실의 냉방과 UPS 부하를 산정합니다.
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Windows 커스텀 ISO / WIM 사이징
커스텀 Windows 설치 이미지의 최종 .iso 크기를 추정합니다.
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IPv6 서브넷 할당기
/N 위임에서 서브 프리픽스를 결정합니다.
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3-2-1 백업 클라우드 TCO
콜드 클라우드 단의 3-2-1 백업 월 비용을 추정합니다.
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