Professional-grade calculators for grading, pipe, concrete, survey, and more. Built for the field — fast, accurate, and always free. No account required.
Convert rise & run to grade % and degrees
Open →Benchmark + rod reading = point elevation
Open →Measured pile stick-up vs. design elevation
Open →Set or transfer benchmark from known control
Open →Pipe drop, slope %, and min slope check
Open →Gravity sewer slope with ASCE pass/fail
Open →HI and cut/fill from grade rod readings
Open →Field rod reading to cut or fill depth
Open →Convert rise/run to grade %, degrees, and inches per foot
Calculate pipe fall and grade % for sewer and drain pipe
Convert between slope %, degrees, and rise/run ratios
Differential leveling — benchmark + rod reading = elevation
Pipe drop and slope % with IPC minimum slope check
Minimum drainage slope by surface type with IBC code reference
Calculate pipe invert elevations by station along any gravity sewer run
Manning's equation — flow velocity, self-cleaning check, and GPM capacity
Required invert drop across sewer manholes — bench vs. outside drop pipe
Gravity sewer slope %, slope ratio, and required invert elevation with ASCE minimum slope pass/fail
Elevation difference and cross-slope for normal crown and one-way drainage
Crown slope % with FIFA, NCAA, and USGA spec compliance check
AASHTO superelevation rate (e%) for highway curve design
Minimum interrow slope for solar farm ponding prevention
Azimuth deviation from target and IEC 62548 pass/fail for solar panel installations
Design gravity pipe slope — ending invert, velocity, and ASCE minimum slope check
Full pipe run from MH to MH — fall, grade %, and invert table
True pipe run length from horizontal distance, elevations, or angle
CY and backfill tons for trench excavation
Trapezoidal trench CY with spoil swell factor and pipe bedding volume
Depth, pitch, and bore length for horizontal directional drilling
Manhole-to-manhole pipe survey format for CIPP rehabilitation projects
Calculate earthwork volume from existing and design elevations
Earthwork cut/fill CY with swell factor, net haul direction, and truck loads
Volume in cubic yards for rectangular and trapezoidal excavations
Average end area method with optional prismoidal correction
Calculate cut/fill volume from a grid of field-shot elevations
Cut/fill depth and catch point distance — slope stake notation for road grading
Field density vs. Proctor max — instant pass/fail compaction result
Field dry density vs. max dry density in g/cm³ — relative compaction % with DOT pass/fail
Tons and cubic yards of gravel or crushed stone
Backfill volume in CY and tons for pits, trenches, and annular excavations
Required setback distance and slope ratio by OSHA soil type (Type A, B, C, Rock)
Free haul vs overhaul volume and CY-station payment quantities
Overturning factor of safety using Rankine earth pressure — estimation only
Required slope ratio, setback, and bench dimensions by OSHA Type A, B, C soil
Factor of safety using simplified infinite slope method — FS pass/fail at 1.5
Allowable and ultimate pile load from diameter, length, and soil type
Angular distortion from two elevation readings — ACI 318 / AISC threshold checks
Loose CY after excavation and compacted CY after placement — swell and shrinkage factors by soil type
Field density vs. Proctor max — instant pass/fail with moisture content guidance for subgrade work
Cubic yards and bags for any slab size
How many 40, 60, or 80 lb bags for any pour
CY of concrete for continuous or pad footings
Concrete volume and bags for tube forms and piers
Bar count, linear feet, and weight for slabs and footings
Length × Width × Depth → cubic yards
Riser height, tread depth, stringer length, and IBC check
Cubic yards and bags of mulch for any area
Net effective depth and ACI 318 concrete cover check by exposure condition
Cubic yards for slabs, footings, and column piers — with waste factor and bag count
Peak stormwater flow via rational method Q = CiA — recommended inlet size
SCS Curve Number method — runoff depth in inches, volume in acre-feet and gallons
Manning's equation — full-flow velocity, CFS capacity, GPM, and self-cleaning velocity check
Number of stakes, spacing, and station labels for any distance
Station list generator — 25/50/100 ft intervals with complete stake count
Calculate perpendicular offsets from a baseline
Azimuth bearing (DMS + quadrant) and distance from two coordinate pairs
Slope to horizontal reduction using vertical angle, slope %, or elevation difference
Instant CUT/FILL grade check from HI and rod reading — color-coded with session log
HI and elevation from backsight/foresight rod readings — differential leveling
Required rod reading from HI and target elevation — cut/fill field check
Rod reading needed at target grade — HI method for laser levels and auto levels
RTK accuracy by baseline distance — base-to-rover setup check
Estimate RTK horizontal and vertical accuracy from baseline distance, PDOP, and mode (Fixed/Float/Static)
Two-peg test procedure and collimation error calculation for rotating lasers
FF and FL flatness numbers from consecutive 10-foot dipstick readings
FF number from elevation readings — pass/fail for FF25, FF35, FF50 warehouse specs
Tangent, curve length, chord, mid-ordinate, and external distance from radius and delta angle
Required pile stick-up for solar racking accounting for grade change
PVC/PVT elevations, high/low point, and K-value for parabolic vertical curves
GCR, east-west row spacing, string length, and piles per acre for solar tracker layouts
Multiple shapes: rectangle, triangle, circle, L-shape
Thickness × Width × Length → board feet
Pieces to total linear feet, area to board footage, unit converter
Convert roof pitch to degrees, percent slope, and rise/run
Convert between MLLW, MHHW, NAVD88, and local tide datums
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