Civil Engineering Calculators — Engineering

Calculate tons of asphalt needed from area, thickness, and mix density.

Calculate cantilever retaining wall with inputs, formulas, and instant results.

Size storm water catch basins from drainage area, runoff coefficient, and rainfall intensity.

Calculate California Bearing Ratio for subgrade strength assessment in road design.

Calculate culvert pipe diameter from peak flow rate and allowable headwater depth.

Calculate horizontal curve radius, length, and deflection angle for road design.

Calculate friction head loss in pipes using the Darcy-Weisbach equation.

Calculate cut and fill volumes for earthwork projects using the average end area method.

Calculate gabion basket quantity and rock fill volume for gabion retaining walls.

Calculate geogrid reinforcement layers and spacing for reinforced soil walls and slopes.

Calculate pipe flow velocity and head loss using the Hazen-Williams equation.

Calculate open channel flow velocity and discharge using Manning roughness equation.

Calculate open channel manning with inputs, formulas, and instant results.

Calculate parking lot dimensions and stall count from total vehicles and layout type.

Calculate pipe flow darcy weisbach with inputs, formulas, and instant results.

Calculate prestress losses and tendon force for prestressed concrete beam design.

Check overturning, sliding, and bearing capacity stability for gravity retaining walls.

Calculate road grade percentage and slope from elevation change and horizontal distance.

Calculate road superelevation with inputs, formulas, and instant results.

Calculate soil compaction percentage from wet density, dry density, and optimum moisture.

Size storm drains using the Rational Method from rainfall intensity and drainage area.

Calculate traffic flow rate, density, and speed using the fundamental traffic flow equation.

Calculate green, yellow, and all-red phase timing for traffic signal intersections.

Calculate flow rate over rectangular, V-notch, and Cipolletti weirs from head measurement.

Estimate traffic recovery from updating decaying content