Engineering tools plus PE review, all 50 states

Engineering made accessible and faster for your project

Planning a wall, a deck, an addition or a drainage fix? Our free tools show every formula and step. When the work needs a stamp, our team prepares the calculations and drawings, and a PE licensed in your state reviews and seals them.

  • Written proposal with scope, fee and schedule
  • Reviewed and sealed by a PE licensed in your state
  • Students and engineers use the same tools to learn and check their work

Get a free quote

Free and no obligation. We review your request and reply with scope, fee and schedule.

Built for the people doing the work

Hands-on owners

Our tools ask the questions an engineer would ask and explain why each answer matters. When you need a stamp, we prepare the package and route it to a PE licensed in your state.

Students

Every tool shows the formula, the inputs and the worked steps, so you can follow the calculation instead of trusting a black box.

Engineers

Check a quick calculation, or join our PE network to review and seal prepared packages in the states where you are licensed. Join our PE network →

Try the concrete beam design tool All calculators

Tool results are preliminary, for planning and learning. They are not for construction or permit until a PE licensed in your state reviews and seals them.

Projects we help with

All services →

Residential

See all (6) →

Site Development & Land

See all (12) →

Drainage, Stormwater & Flood

See all (14) →

Foundations & Structural

See all (8) →

Buildings & Structural

See all (22) →

Geotechnical & Soils

See all (7) →

Water, Sewer & Septic

See all (9) →

Transportation

See all (8) →

Permits, Environmental & Compliance

See all (9) →

Inspections & Reports

See all (6) →

Legal & Insurance

See all (9) →

How it works

1

Describe the project

Tell us what you need and where. Photos, a survey or old plans help, but are not required to start.

2

Get a written proposal

We review it and send scope, deliverables, fee and schedule, including any site visit or testing the job needs.

3

We prepare the package

Our tools and team run the calculations, check them against the code and prepare the drawings or report.

4

A PE in your state seals it

A PE licensed in your state reviews the package, seals it and, where needed, files it for permit.

Free calculators

All calculators →
Roof Pitch CalculatorConvert roof pitch (rise per 12 in of run) to angle and percent, and calculate rafter length and the pitch multiplier.Stair Stringer CalculatorCalculate number of risers, riser height, treads, total run, stringer length and angle for stairs that meet IRC limits.Concrete Bag CalculatorFind how many 40, 60 or 80 lb bags of premixed concrete you need for a small slab, pad or footing.Concrete Cylinder Strength and Water-Cement Ratio CalculatorCompute compressive strength from a cylinder break load and diameter, and the water-cement ratio of a mix by weight.Concrete Slab CalculatorCalculate cubic yards of concrete for a slab, patio or driveway, including a waste allowance and an order quantity rounded to the quarter yard.Concrete Slab Cost CalculatorEstimate the cost of a concrete slab from its size, your local ready-mix price per yard and an installed labor rate per square foot.Continuous Footing Concrete CalculatorEstimate concrete for a continuous wall footing (strip footing) from its total length, width and depth.Rebar Grid CalculatorEstimate the number of bars, total length and weight of rebar for a slab grid at a given spacing, with lap and waste allowance.Round Column and Sonotube CalculatorCalculate concrete volume for round columns, piers and sonotube forms, with total cubic yards and 80 lb bag count.Stress and Pressure Unit Converter (ksi, psi, MPa)Convert stress and pressure units used in civil engineering: ksi to MPa, MPa to ksi and psi, psf to kPa.Cut and Fill Volume Calculator (Average End Area)Compute earthwork volume between two cross-sections using the average end area method, in cubic feet and cubic yards.Earthwork Swell and Shrink CalculatorConvert earthwork between bank, loose and compacted cubic yards using swell and shrinkage factors, and find borrow needed for fill.

Projects in every state

All states →
Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Guides

All guides →
Concrete Strength (psi) ExplainedConcrete strength is specified as the 28-day compressive strength, f'c, in pounds per square inch. Residential concrete is commonly 2,500 to 4,000 …How to Read a Survey vs a Site PlanA survey records what exists and where the legal boundaries are; a site plan shows what is proposed. Both use similar symbols, …Soil Bearing Capacity ExplainedSoil bearing capacity is the pressure the ground can carry under a footing without failing or settling too much. Footings are sized …What Is Stormwater Detention?Stormwater detention temporarily stores runoff from paved and roofed areas and releases it slowly, so a developed site does not send more …What Is a Culvert?A culvert is a pipe or box structure that carries a stream or drainage channel under a road, railroad, driveway or embankment. …What Is a Load Path?A load path is the continuous route that loads take from where they are applied, through the structure, down to the foundation …What Is an Easement?An easement is a legal right for someone else to use part of your property for a specific purpose, such as utilities, …Civil Engineer vs Architect: Who Does What?Architects design buildings: their layout, appearance and code compliance for occupants. Civil engineers design the site and infrastructure around and under them. …