Construction & Home calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Gravel Driveway Calculator - Tons, Yards & Base Depth
Determine exact crushed stone tonnage, cubic yards, and dump truck loads for driveways, parking pads, and sub-bases.
Gutter Sizing Calculator - Downspout Area & Rainfall
Determine required gutter width (5" vs 6" K-Style) and downspout count based on roof drainage area and rainfall intensity.
Horse Hay Calculator - Daily Forage Intake & Bales
Determine daily forage requirements, monthly bale consumption, waste margins, and winter season hay stockpiles.
Horse Weight Calculator - Heart Girth & Body Length
Estimate equine body weight in pounds and kilograms using heart girth and point-of-shoulder to point-of-buttock measurements.
Hotel Linen Par Level Calculator - Inventory & Turnover
Determine total linen inventory requirements across guest rooms, laundry wash cycles, and linen closets to maintain 3.0 to 4.0 par stock.
Insulated Glass U-Factor Calculator - SHGC & Thermal
Determine center-of-glass U-factor, thermal resistance (R-value), Solar Heat Gain Coefficient (SHGC), and condensation resistance for double and triple pane IGUs.
Laundry Chemical Dosage Calculator - Wash Formula PPM
Determine automatic chemical pump injection dosages (oz per hundredweight / cwt), active chlorine bleach PPM, and sour pH neutralization.
Linen Flatwork Ironer Calculator - Roll Speed & PPH
Determine roll finishing speed (FPM), sheets and tablecloths processed per hour (PPH), steam evaporation capacity, and feeding labor requirements.
Mortar Mix Ratio Calculator - Type N, S, M, O Cement
Scale exact batch volumes of Portland cement, hydrated lime, and washed masonry sand for ASTM C270 Type M, S, N, and O mortars.
Paint Calculator - Gallons, Primer & Wall Square Feet
Determine exact gallons of wall paint, ceiling paint, and primer needed accounting for surface porosity and multiple coats.
Pasture Stocking Rate Calculator - Animal Units (AUM)
Determine pasture carrying capacity, head counts, and Animal Unit Months (AUM) while preserving root reserves.
Paver Patio Calculator - Base Gravel, Sand & Paver Count
Determine exact paver counts, compacted crushed stone road base, bedding sand depth, and polymeric joint sand.
Pipe Friction Loss Calculator - Hazen-Williams PSI Drop
Calculate fluid pressure drop in PSI, total dynamic head loss, and water velocity in water piping using the Hazen-Williams equation.
Pool Volume Calculator - Gallons & Chemical Turnover
Calculate exact swimming pool water volume in Gallons and Liters for proper chemical balancing and filtration pump turnover rate sizing.
Rainwater Harvesting & Cistern Tank Sizing Calculator
Calculate total roof catchment rainwater yield (gallons & liters), first-flush diversion, and optimal cistern tank storage capacity.
Rebar Grid Calculator - Grid Spacing, Weight & Linear Ft
Determine rebar bar counts, total linear footage, lap splices, and steel tonnage for reinforced concrete slabs.
Roof Pitch Calculator - Slope Pitch Angle & Rafter Rise
Convert roof rise over run into pitch angle degrees, slope multiplier factors, and true surface area scaling.
Roof Rafter Calculator - Common Rafter Length & Overhang
Calculate precise common rafter cutting length, ridge board deductions, bird’s mouth seat cuts, and overhang dimensions.
Roofing Shingle Calculator - Squares & Bundle Count
Determine roofing squares, architectural shingle bundle counts, starter strips, and ridge caps including complexity waste factors.
Sonotube Concrete Calculator - Pier Volume & Bag Count
Determine concrete volume in cubic yards and pre-mixed bag counts for cylindrical deck post piers and footings.
Stair Stringer Calculator - Rise, Run & Steps Sizing
Calculate exact stair stringer cuts, individual step rise and run, stringer lumber stock length, and IRC building code compliance.
Stormwater Runoff Calculator - Rational Method Peak Q
Calculate peak stormwater runoff discharge rate (Q) in Cubic Feet per Second (CFS) using the civil engineering Rational Equation Q = CIA.
Structural Silicone Glazing Bite Calculator - ASTM C1401
Size structural silicone adhesive joints adhering vision glass to aluminum curtain walls per ASTM C1401 engineering design standards.
Surge Tank Sizing Calculator - Water Hammer Volume Area
Size open standpipe and throttled surge tanks for penstocks and water pipelines: calculate Thoma stability area, maximum water upsurge (Zmax), and required volume per AWWA M11.
Tile & Grout Calculator - Square Feet, Boxes & Bags
Estimate total tile piece count, box requirements, waste margin cuts, and pounds of powdered grout for floors and shower walls.
Trench Excavation Calculator - Cubic Yards & Soil Swell
Determine trench cut volume, soil swell expansion, loose haul-off volume, and dump truck counts.
Wallpaper Calculator - Rolls Needed & Pattern Repeat
Determine exact wallpaper roll counts, usable strip yields, and waste allowances for straight match and half-drop pattern repeats.
Water Heater Sizing Calculator - Tankless & Tank GPM
Size tankless and storage tank water heaters by calculating peak simultaneous flow rates (GPM) and groundwater temperature rise (ΔT).