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Size piping for water, steam, compressed air & gas in seconds — instant velocity, pressure drop, and recommended commercial pipe diameter.
Compute total capacity and liquid volume from level — vertical & horizontal cylindrical, spherical, conical-frustum, and rectangular tanks. Live SVG diagram updates as you type.
Shear, bending moment and deflection for simply-supported and cantilever beams — multiple load types and live SFD/BMD diagrams.
Look up AISC W shapes, channels, angles, HSS and metric universal beams — A, I, S, Z, r plus quick LRFD φMn capacity.
Singly-reinforced concrete beam design per ACI 318 / NSCP 2015 — required As, ρ checks, suggested bar combinations and φMn.
Size square isolated footings — soil bearing area, one-way and two-way (punching) shear, flexural reinforcement.
Estimate concrete volume, cement bags, sand, gravel and steel reinforcement weight for slabs, beams, columns, footings and walls.
Solve open-channel flow with Manning’s equation — rectangular, trapezoidal, triangular and circular sections with live cross-section.
Peak runoff using Q = CIA — multi-surface areas with weighted C, Kirpich time-of-concentration and metric/imperial outputs.
Bearings & distances → coordinates, closure error, balanced area — with live SVG plot of the traverse.
Horizontal circular curves and vertical parabolic curves — T, L, M, E, K, BVC/EVC, sight distance and station report.
Terzaghi (1943) and Meyerhof (1963) ultimate & allowable bearing capacity for shallow footings — strip, square, rectangular, circular.
ASCE 7-22 / NSCP 2015 directional procedure (MWFRS) — design wind pressures for windward, leeward, side and roof faces.
Equivalent Lateral Force per ASCE 7-22 / NSCP 2015 — base shear V from SDS, SD1, R, Ie, with floor Fx distribution.
All ASCE 7 / NSCP 2015 LRFD & ASD load combinations evaluated instantly — controlling case and demand highlighted.
Stability (sliding, overturning, bearing) plus stem flexure/shear — Rankine active & passive, surcharge, base friction.
α-method (clay) and β-method (sand) skin friction plus end bearing in layered soil — ultimate & allowable capacity, capacity vs depth chart.
Active, passive, at-rest pressures (Rankine & Coulomb) with surcharge, water table, cohesion — resultant force and pressure diagram.
1-D primary consolidation settlement of clay using e₀, Cc, Cr with NC / OC handling, plus time-rate from Cv and Tv.
Generate the φP-φM interaction diagram for tied rectangular RC columns — plot load points and check capacity.
Direct Design Method per ACI 318 / NSCP 2015 — min thickness, total static moment M0, distribution to spans & column / middle strips.
Concentric base plate sizing (LRFD), anchor tension demand from column moment, plus ACI 318 Ch. 17 anchor steel & concrete breakout checks.
Elastic vector method for in-plane eccentric bolt groups — direct & torsional shear, controlling bolt and design check.
Method of Joints solver — define nodes, members, supports & loads → reactions and member forces with color-coded T/C diagram.
AISC LRFD fillet weld design — strength per length, total capacity, with optional load-angle increase factor and base-metal shear check.
Inlet- and outlet-control headwater for circular & box culverts following FHWA HDS-5 simplified method, controlling type reported.
Discharge from rectangular & V-notch weirs, broad-crested weirs and free-flow orifices — instant Q for any geometry.
Required storage volume by Modified Rational Method — sweep storm durations to find the controlling required storage.
Hazen-Williams loop-iteration solver for looped distribution networks. Define pipes & loops, get balanced flows.
Composite Curve Number from sub-areas + HSG, then runoff Q from rainfall depth (NEH-4 / TR-55) with AMC adjustment.
Side-by-side tc from five common methods — Kirpich, Bransby-Williams, NRCS lag, Kerby and TR-55 channel V — for direct comparison.
Average end-area & prismoidal volumes from a station table of cut/fill — cumulative net volume and mass-haul diagram.
Required e for design speed & curve radius (AASHTO), plus runoff length and tangent runout for the lane width.
Required Structural Number SN from ESALs, reliability, MR, ΔPSI — then split SN among AC, base and subbase layers.
Distance and bearing/azimuth between any two N,E points. Single inverse plus a sequential point-list table.
Reduce a level book — Height of Instrument or Rise & Fall, with arithmetic check and loop closure.
Field stake-out for a circular curve — chord deflection angles from PC and N, E coordinates of every station.
DMS ↔ decimal, quadrant ↔ azimuth, bearing arithmetic (add / subtract / interior angle), plus radians and gradians.
Length, area, volume, mass, force, pressure, moment, density, flow, energy, power, temperature, velocity & viscosity — all in one.
Translate between %, ratio (1:n), angle (°), V:H and rise/run for any input form — live cross-section sketch.
ACI 318 development length for tension/compression bars, hooks, and Class A/B lap splices — with all ψ factors.
Estimate RC beam crack width using the Gergely & Lutz expression (ACI 224R) and compare with exposure-class limits.
Design a one-way RC slab — minimum thickness, factored moment, required steel and bar spacing per ACI 318.
In-plane shear and reinforcement check for cast-in-place concrete shear walls per ACI 318 §11.5 with boundary-element flag.
Two-way punching shear capacity around a column for slabs per ACI 318 §22.6 — interior, edge, corner.
Two-column rectangular footing sized by the resultant-of-loads method to keep soil pressure uniform.
Soil contact pressures and approximate settlement for a rigid mat/raft under biaxial eccentricity.
Proportion concrete mix per ACI 211.1 — water, w/c, cement, coarse and fine aggregate by absolute volume per m³.
Build a BBS — cut lengths with bend deductions, total weight per the d²/162 rule, and CSV export.
AISC 360 §E3 column compression capacity — Fe, Fcr, φPn for elastic and inelastic buckling.
Plastic moment capacity and stud count for steel-concrete composite beams per AISC 360-I.
Capacity check per AISC 360 §J3 — bolt shear, plate bearing, and tearout, governing case identified.
Closed-form deflection, moment, and shear for common load cases — simple, cantilever, fixed.
Sum rectangular plates to compute centroid, moment of inertia, section modulus and radius of gyration.
Single trial-circle factor of safety using Bishop’s simplified method — for preliminary slope assessment.
Classify soil per USCS (ASTM D2487) and AASHTO M145 with Cu, Cc, plasticity index, and group index.
Plot a semi-log gradation curve from sieve % passing data and compute D10, D30, D60, Cu, Cc.
Plot dry density vs moisture content and find Maximum Dry Density and Optimum Moisture by quadratic fit.
California Bearing Ratio for laboratory loads at 2.5 / 5.0 mm or direct field readings, with subgrade rating.
Preliminary embedment depth and approximate maximum moment for cantilever sheet pile in cohesionless soil.
Simplified seismic liquefaction potential per NCEER (Youd et al.) with SPT-based CRR, CSR and FoS.
Total Dynamic Head and Available NPSH for centrifugal pump sizing — Hazen-Williams losses with minor coefficients.
Joukowsky surge head and pressure for sudden valve closure with slow-closure (Michaud) check.
Pipe sizing for gravity sanitary sewers using Manning’s equation, peak factor, and partial-flow ratios.
Sum fixture units across plumbing fixtures and convert to peak demand using Hunter’s method.
Compute gradually-varied flow profile in a trapezoidal channel using the direct-step method.
Gutter flow Q and curb-opening intercept length per HEC-22, with inlet efficiency for partial L.
Compute crest or sag vertical curve geometry — A, K, BVC/EVC, high/low point, and minimum L for design SSD.
AASHTO Stopping Sight Distance with grade and friction adjustment, plus a Passing Sight Distance estimate.
Optimum cycle length and per-phase effective green using Webster’s formula. Add lane-group critical flow ratios.
Solve for required Structural Number SN via AASHTO 93 with reliability, S₀, ΔPSI, Mr.
Build a cumulative mass-haul diagram from station volumes — identify cut/fill balance, borrow/waste, and overhaul ranges.
Compute new coordinates from a starting point using bearings and distances — quadrant or azimuths, with traverse plot.
Locate an unknown station P from three known stations and two observed angles using Tienstra’s formula.
Convert between UTM and geographic on WGS84 or PRS92 with zone, grid convergence, and scale factor.
Compute earthwork volume from cross-section areas using Average End Area and Prismoidal methods.
Build a quick Bill of Quantities — line items, OH&P markup, VAT, grand total, and CSV export.
Estimate daily output for a crew (and equipment) and convert a total quantity into days and weeks.
Generate a planned S-curve and weekly cash flow from project duration, contract amount, and shape factor.
Add activities with predecessors and durations — computes ES, EF, LS, LF, total float, and the critical path.
Add point and distributed loads on a simple-span or cantilever beam — live shear and moment diagrams.
Compute principal stresses, max shear, and principal/shear angles from σx, σy, τxy — with full SVG plot.
Solve a continuous beam with the Three-Moment Theorem — support moments, reactions, approximate Mmax.
Trace gravity loads from slab through beam, column, and foundation for rapid take-offs and column sizing.
Top & bottom fiber stresses at transfer and service for a prestressed beam — with ACI 24.5 allowable comparison and Class U/T/C handling.
Creep + shrinkage multiplier λΔ = ξ / (1 + 50ρ′) per ACI 318 §24.2.4 with full long-term + sustained deflection check.
Single-span deep beam with concentrated load — solves strut angle, strut/tie forces, and required tie steel per ACI 318 Ch. 23.
ACI 318 §16.5 corbel sized for Vu and Nuc — computes Avf (shear-friction), An (tension), Af (flexure), As main, and Ah closed stirrups.
ACI 318 §22.9 shear-friction across cold joints, dapped ends, and corbel interfaces — required Avf and ϕVn cap with all four code limits.
Floor-by-floor diaphragm design force per ASCE 7 §12.10 / NSCP with min and max bounds, plus chord tension estimate.
Beam & column ductile detailing per NSCP Ch. 4 / ACI 318 Ch. 18 — hoop spacing, hinge zone length, lap-splice exclusion zones.
AISC 360 §H1.1 combined axial + biaxial bending interaction (auto-picks H1-1a vs H1-1b by Pr/Pc).
AISC 360 §F2 LTB capacity for I-shapes — yielding / inelastic / elastic regions with auto Cb amplification.
Web/flange slenderness and bending-strength reduction Rpg for slender-web doubly-symmetric I-shapes per AISC §F5.
Axially-loaded branch on rectangular HSS chord — chord plastification, punching shear, sidewall yielding per AISC 360 Ch. K.
AISC 360 §J4.3 block-shear capacity at bolted gusset and angle-leg connections — Rn = min of two failure paths.
AISC 360 §J10 concentrated-force checks — local web yielding, web crippling, and compression buckling at I-shape webs.
Laterally-braced Z and C purlin moment capacity per AISI S100, with Mu vs ϕb Mn and L/180 deflection check.
Four-bolt unstiffened end-plate moment connection — bolt tension demand, plate thickness via yield-line, and weld sizing.
Group efficiency by Converse-Labarre, Feld, and Seiler-Keeney with block-failure check for cohesive soils.
Axial capacity of drilled shafts in cohesive (α-method) and cohesionless (β-method) soils with shaft + tip resistance.
Side-by-side ultimate bearing capacity from Terzaghi, Meyerhof, Hansen, and Vesic with shape factors and allowable q_a.
Per-layer reinforcement Tmax, pullout resistance and FS_po for steel-strip MSE walls per FHWA NHI-10-024 simplified method.
Seepage discharge Q from flow-net counts (Nf, Nd) plus exit gradient i_e and FS against piping.
Elastic settlement of shallow foundations — Schmertmann strain-influence and Mayne-Poulos closed-form, with the lesser recommended.
Distribute existing wall or column load over underpinning pits / piers and check soil allowable bearing.
Talbot or Sherman IDF fit with two-anchor return-period interpolation for any (t, T).
Synthetic UH for ungauged watersheds — SCS triangular and Snyder synthetic with peak qp, lag, and base time.
Modified Puls (Storage-Indication) routing of a triangular inflow through a single-stage reservoir with weir outflow.
Route a triangular inflow through a channel reach using Muskingum K, X — outflow peak, attenuation, and stability check.
CSU pier scour and contraction scour per FHWA HEC-18 — Froude, K-factors, ys, and total local scour.
Triangular gutter spread T per HEC-22 §4 — for inlet spacing and curb spread design with Manning n.
Estimate T-year peak discharge from sample mean, SD, and skew — Gumbel and simplified Log-Pearson III.
Wet-well active volume and cycle-time check (≥ 6 min between starts) per Ten States Standards.
Stilling basin hydraulic-jump sizing — sequent depth y2, jump length, energy loss, and USBR basin type.
Single- and two-lane roundabout entry capacity per HCM 2010 (c = A·e^−B·v_c) with V/C and LOS estimate.
HCM control delay (uniform + incremental + initial-queue) per approach with V/C and LOS A–F.
AASHTO/DPWH justification — speed reduction ΔV ≥ 15 kph and upgrade truck flow ≥ 200 veh/hr criteria.
Lumen-method roadway lighting — pole spacing for target Eav with CU and LLF, plus poles/km.
Segment and intersection crash rate with critical-rate hot-spot test for safety-screening.
Centerline, edge line, and lane line lengths plus paint volume and reflective bead quantities.
Bursa-Wolf 7-parameter coordinate transformation between PRS92 (Clarke 1866) and WGS84/ITRF for legacy-vs-modern survey reconciliation.
Linearly interpolate the spot elevation between two contours along a connecting line — for quickly reading topo maps.
Earthwork volume between two cross-sections — Average End-Area and Prismoidal Formula plus the prismoidal correction.
Distribute traverse misclosure to each leg by Compass (Bowditch) or Transit Rule with relative precision 1:N.
Azimuth from sun or Polaris by hour-angle method — using observed φ, δ, and t with East/West correction.
Asphalt mix volumetrics — VTM, VMA, VFA, dust/binder — with DPWH/AASHTO acceptance ranges by layer.
Mix design at N_design — VTM, VMA, VFA, dust/Pbe, %Gmm at N_initial / N_max with NMAS-based VMA target.
In-situ concrete strength from Schmidt rebound hammer per ASTM C805 — 10-reading mean, orientation correction, 5%-percentile.
Correct cored cylinder strength to standard cylinder — L/D, diameter, moisture conditioning, and casting-axis factors.
Sieve analysis with % passing curve, fineness modulus, classification, and ASTM C33 fine-aggregate envelope check.
Full EVM dashboard from PV, EV, AC, BAC — CPI, SPI, CV, SV, EAC, ETC, VAC, TCPI per PMBOK.
Beta-distribution TE = (O+4M+P)/6 with σ, variance, triangular alternative, and confidence range.
List up to 8 activities with start/finish/resources — peak demand, overload days vs cap, and total resource-days.
Escalate base-year cost to a target year using a price index — escalation factor, total %, and CAGR.
Compare up to 6 bidders by total bid vs ABC, with post-qualification scoring per RA 9184 / GPPB rules.
Concrete, formwork, and rebar take-off for a single rectangular RC element with unit-cost rollup to ₱.
Heavy-equipment owning + operating cost per hour per Caterpillar PHB — depreciation, interest, fuel, FOG, repair, tires.
Sensible and latent cooling load using ASHRAE CLTD/SCL/CLF — roof, walls, glass, lights, people, equipment.
ASHRAE equal-friction sizing — round D, velocity, equivalent rectangular a × b at target Δp/L.
Pick a copper THWN/THHN size for ampacity and voltage drop ≤ target per PEC 2017 / NEC.
Rolling-sphere zone of protection and a simplified IEC 62305 risk index — recommends LPL I–IV.
Indoor lumen-method design — fixture count for a target Eav given CU, LLF, RCR, and lamp lumens.
Three-compartment septic tank sizing per DENR DAO 2019-19 — wastewater volume, sludge, and dimensions.
Bioretention cell or dry detention basin from drainage area and runoff coefficient — WQV, area, and infiltration time.
Annual soil loss A = R·K·LS·C·P from RUSLE — gives soil loss vs tolerable T for ESC plan design.
Activated-sludge sizing from population equivalent — Q_avg, peak Q, BOD/TSS, and aeration-tank volume V.
Approximate fundamental period Ta = Ct · hn^x with Cu upper limit per NSCP / ASCE 7 §12.8.2.
Walking-excitation peak acceleration ap/g vs occupancy limits per AISC Design Guide 11 (offices, residential, dining, rhythmic).
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