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STEELTOETOOLS

Construction & Safety Calculators

58 free tools

Instant, sourced calculators for materials, rigging and occupational safety. US customary units by default, metric one tap away. Every formula is documented and cited on the page.

Conversions

Area Converter
Square feet, square yards, acres, hectares, square meters and roofing squares.
Cubic Yards to Tons Converter
Yards to tons and back, with a sourced density per material instead of one made-up factor.
Feet and Inches to Decimal Converter
Feet, inches and fractions to decimal feet — and back to a tape measure reading.
Pressure Converter
PSI, bar, kPa, MPa, atmospheres, kgf/cm², inHg and water column, with exact NIST factors.
Temperature Converter
Fahrenheit, Celsius, Kelvin and Rankine, with the exact NIST relations.
Weight & Tons Converter
Pounds, kilograms, short tons, long tons and metric tons, with the exact NIST factors.

Paving & Earthwork

Asphalt Tonnage Calculator
Tons of hot mix from your area, compacted thickness and the Gmb on your mix design.
Compaction Lift Thickness Calculator
Lift count, loose thickness and compacted thickness — checked against real state DOT ceilings.
Gravel Driveway Depth & Layer Calculator
Sub-base, base and surface layers priced out separately — with the FHWA thickness table beside your number.
Excavation Volume & Truckload Calculator
Bank cubic yards, loose cubic yards and the truckload count — with swell factors that are measured, not guessed.
Gravel Calculator
Tons and loose cubic yards to order for a driveway, pad or trench — compaction included.
Sand Calculator
Cubic yards, cubic feet and bags from area and depth — tonnage only from your own density.
Topsoil & Fill Dirt Calculator
Cubic yards, cubic feet and bags from area and depth — tonnage only if you have a real density.

Lumber & Framing

Board Foot Calculator
Board feet, lineal feet, MBF and cost for one size of lumber or a whole pack.
Deck Board Calculator
Deck boards, rows and fasteners, figured on actual widths and real gaps.
Drywall Calculator (Sheets, Mud, Tape and Screws)
Sheets, buckets of mud, rolls of tape and screws for a room or a wall area.
Joist and Rafter Count Calculator
How many joists or rafters at your spacing, plus blocking, rim boards and board feet.
Plywood and OSB Sheet Calculator
Sheets of plywood or OSB for any area, gap included, with waste and cost.
Roofing Squares Calculator
Squares and bundles of shingles from area or footprint, pitch factor included.
Stair Rise and Run Calculator
Riser height, total run and stair angle from your numbers, checked against the OSHA stairway rules.
Stud Wall Framing Calculator
Studs, plates and board feet for one framed wall, at the spacing on your drawings.

Industrial & Manufacturing

Bolt Torque Calculator (T = K x D x F)
Torque from preload, or preload from torque — with the nut factor and the target clamp load you supply.
Hydraulic Cylinder Force Calculator
Bore, rod and pressure in — push force, pull force, rod speed and oil per stroke out.
OEE Calculator (Overall Equipment Effectiveness)
Five numbers off the shift report give you OEE, its three factors, and where the lost minutes went.
SFM to RPM Calculator (Speeds & Feeds)
Cutting speed and diameter in, spindle RPM and feed rate out — or start from the RPM you have and read the surface speed back.
Steel Weight Calculator (Pipe, Plate, Bar & Tube)
Enter the outside dimensions and wall thickness you measured and get pounds per foot, pounds per piece and the total for the order.

Concrete & Masonry

Brick Calculator (Count and Mortar)
Bricks and mortar for a wall, straight from the BIA Technical Notes 10 tables.
Concrete Block (CMU) Wall Calculator
Blocks, mortar bags and grout for a CMU wall, from the NCMA TEK estimating tables.
Concrete Bag Calculator (40, 60, 80 lb)
How many 40/60/80 lb bags for your pour — from the manufacturer's yield, not a guess.
Concrete Column & Pier Calculator
Round or rectangular columns and piers — volume, bags, weight and cost, one column or fifty.
Concrete Footing Calculator
Cubic yards, bags and cost for continuous or pad footings — from the dimensions on your plan.
Concrete Slab Calculator
Cubic yards, bag counts and cost for a slab, pad or footing — waste allowance included.
Concrete Stairs Calculator
Cubic yards, bags and weight for a concrete stair, from your own rise and run.
Fence Post Concrete Calculator
Bags per post and for the whole fence, from the hole you are actually digging.
Mortar Mix Calculator (Brick & Block)
Bags of mortar, sand and mixing water from the published yields — not a guess.
Rebar Calculator (Quantity and Weight)
Bars, linear feet, stock lengths and weight for a rebar mat, at the spacing on your drawings.

Heat & Cold Stress

Wind Chill & Frostbite Time Calculator
Wind chill in °F, plus the 30, 10 or 5-minute frostbite zone from the NWS chart.
Heat Index & Work/Rest Schedule Calculator
Heat index, NWS risk category and the OSHA heat-trigger actions for today's shift.
Work in Heat Water Intake Calculator
Cups per hour, quarts per shift, and gallons for the whole crew — with the published upper limits.
WBGT Calculator from Measured Temperatures
Enter natural wet-bulb, globe and dry-bulb temperatures — get the WBGT for that work area.

Recordkeeping & Safety Metrics

DART Rate Calculator
Columns H and I of your OSHA 300A, plus hours worked — the rate OSHA targets inspections on.
Injury Cost Estimator
Claim cost in, true cost out — with the extra sales it takes to pay for it.
OSHA 300A Summary Helper
Total the 300A columns, catch the classic mistakes, and read your three rates off the same numbers.
Severity Rate & Lost Time Rate Calculator
Days away and days of restriction, per 100 workers — plus the lost time case rate and days per case.
TRIR Calculator
Recordable cases and hours worked in, TRIR out — using the four case columns of the OSHA 300A summary.

Fall Protection

Fall Clearance Calculator
Enter your anchorage, lanyard and the clearance you actually have. The calculator tells you whether a fall would be arrested above the lower level.

Rigging & Lifting

Forklift Load Center & Capacity Calculator
A longer load center means less capacity. This runs the load-moment arithmetic of 1910.178 Appendix A.
Load Weight Estimator (Material & Shape)
Weight of a load from its shape and material — the step before any sling calculation.
Rigging Sling Tension Calculator
Tension per leg from load, angle and number of legs — and why a 30° angle doubles it.
Sling D/d Ratio Calculator
Divide the bend diameter by the rope diameter — and see whether your sling's rated load still stands.

Noise

Hearing Protector NRR Derating Calculator
What noise level reaches the ear? Derate the NRR the way OSHA and NIOSH do.
Noise Distance Attenuation Calculator
The level at a new distance, the distance that gets you to 85 dBA, and several sources added correctly.
Noise Exposure TWA Calculator (OSHA & NIOSH)
8-hour TWA and dose from levels and durations — OSHA and NIOSH side by side.

Ergonomics

NIOSH Lifting Equation Calculator
RWL and Lifting Index from the Revised NIOSH Lifting Equation, with every multiplier shown.

Industrial Hygiene

Respirator APF & Maximum Use Concentration Calculator
APF from OSHA Table 1, MUC = APF x the exposure limit, and the minimum APF your exposure needs.
Silica Table 1 Task Lookup
The 18 Table 1 tasks, their specified controls and the required APF — with the total-shift four-hour rule applied.

Excavation & Trenching

Soil Type Classification Helper (A, B, C)
Answer the Appendix A questions and see which clause drives Type A, Type B or Type C — and what still has to be tested.
Trench Slope & Excavation Calculator
Slope, cut-back distance, top width and volume by OSHA soil type — with the 4 ft, 5 ft and 20 ft thresholds.