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114 tools

Automotive Calculators

10 tools

Auto Loan Calculator

Calculate auto loan payments, interest, and amortization schedules

Engine Torque Calculator

Calculate engine torque and horsepower relationships

Gas Mileage Calculator

Track fuel efficiency and calculate MPG for your vehicle

Tire Size Calculator

Compare tire sizes and calculate speedometer differences

lb/hr to cc/min Injector Flow Converter

Bidirectional fuel injector flow converter between lb/hr and cc/min, with fuel-density (gasoline, E85, methanol, diesel, race) corrections and standard injector size matching.

Engine Displacement Calculator

Calculate engine displacement in cc, liters and cubic inches from bore, stroke and cylinder count. Reverse-solve mode, 20+ engine presets, bore/stroke ratio analysis, mean piston speed safety bands.

EV vs Gas Fuel Savings Calculator

Compare lifetime operating cost, CO2 reduction and breakeven year for an EV vs equivalent ICE vehicle. State grid intensity, federal tax credit, 7 vehicle preset pairs.

Fuel Injector Sizing Calculator

Calculate required injector size (lb/hr + cc/min per injector) from target HP, cylinder count, BSFC, fuel type and duty cycle. Standard size matching with headroom analysis.

L/100km Fuel Economy Converter

Universal fuel-economy converter. L/100km ↔ MPG (US/UK) ↔ km/L ↔ MPGe. 6-currency cost projections, 5-tier efficiency rating, CO2 emissions.

Speedometer Error Calculator (Tire Size)

Calculate speedometer error and odometer drift caused by tire-size changes. Original vs new tire diameter, % error, gear-ratio recalibration suggestions.

Construction Calculators

56 tools

Board and Batten Layout Calculator

Calculate board and batten spacing for perfect layouts

Feet and Inches Calculator

Add, subtract, and convert feet and inches measurements

Scale Calculator

Convert between different measurement scales for plans

Square Footage Calculator

Calculate room and area square footage accurately

Lumber Weight Calculator

Calculate lumber weight from species, dimensions and quantity. 17+ wood species, kiln-dried/green/pressure-treated moisture.

Cabinet Door Size Calculator

Calculate cabinet door dimensions for full overlay, partial overlay, or inset construction. Auto hinge count.

Wainscoting Calculator

Calculate panels, beadboard, board-and-batten, raised wainscoting + trim materials for any room.

Concrete Block & Mortar Calculator

Calculate CMU blocks and mortar bags for a wall. 7 block sizes, 4 mortar types.

Concrete Block Fill Calculator

Calculate concrete/grout cubic yards to fill hollow block cells. Full or partial fill, bond beams.

Concrete Mix Ratio Calculator

Calculate ingredient ratios + bags for any PSI strength. Pre-mix or scratch.

Concrete Mesh (WWF) Calculator

Calculate welded wire mesh rolls/sheets for slab reinforcement with overlap.

Concrete Steps Calculator

Calculate concrete cubic yards for a set of steps with code-compliance check.

Concrete Weight Calculator

Weight of concrete for any volume and mix density. Standard, lightweight, heavyweight.

Rebar Material Calculator

Total linear feet, pieces, ties and weight for a slab/footing rebar grid.

Rebar Weight Calculator

Calculate rebar weight from size and length. All US (#3-#18) and metric (6-40mm) sizes.

Baluster Spacing Calculator

Baluster count and IRC 4-inch sphere code compliance for railings. Multi-run.

Deck Stain Calculator

Gallons of stain/sealer for deck surface, rails, balusters, stairs.

Paver Base Calculator

Crushed stone + bedding sand for paver project. All project types.

Paver Calculator

Pavers needed for project with pattern-specific waste factors.

Polymeric Sand Calculator

Bags of polymeric sand for paver joints.

Asphalt Sealer Calculator

Gallons of sealcoat for driveways/parking lots with coats and surface condition.

Concrete Driveway Calculator

Concrete cu yd, gravel base, rebar/mesh, and total cost for a concrete driveway.

Gravel Driveway Calculator

Cubic yards + tons of gravel for rural/residential driveway. 3-layer or single.

Fence Stain Calculator

Gallons of stain/sealer for a fence — privacy, picket, shadowbox, with rails and posts.

Post-Hole Concrete Calculator

Concrete bags per post hole for fence, deck, mailbox, gate posts.

Vinyl Fence Calculator

Panels, posts, caps, gates, rails for a vinyl fence project.

Linear Feet to Square Feet Converter

Convert linear feet of any material to square feet given width — and vice versa.

Acreage Calculator

Acres from any shape — rectangle, polygon, circle, triangle. Multi-shape sum.

Elevation Grade / Slope Calculator

Slope/grade converter — %, degrees, ratio, rise/run. For driveways, ramps, roofs.

Lawn Mowing Time Calculator

Time and cost to mow a lawn based on area and mower deck.

Plant / Flower Spacing Calculator

Plants needed for an area at specified spacing. Rectangular or triangular pattern.

Sod Weight Calculator

Weight of sod for transport. Slab, roll, or pallet. Moisture-aware.

Cubic Feet Volume Calculator

Universal volume calculator — box, cylinder, sphere, cone, prism. 6 unit outputs.

Cubic Inches Calculator

Cubic inch volume calc with cc/gallon/liter conversion.

Cubic Meters Calculator

SI-native universal m³ volume calculator with 7 shapes, multi-shape sum, all-unit output.

Cylinder Cubic Feet Calculator

Cylinder volume in cu ft — Sonotubes, columns, tanks, pipes, drums.

Cylinder Cubic Yards Calculator

Cylinder volume in cu yd — concrete footings, columns, round pools.

Inch Fraction Calculator

Add, subtract, multiply, divide inch fractions with mm + decimal output.

Square Feet to Cubic Feet Converter

Convert area × depth to volume — mulch, gravel, topsoil, concrete slabs.

Square Feet to Cubic Yards Converter

Area-to-yd³ — concrete, gravel, mulch, topsoil orders.

Square Inches Calculator

Area in sq in for any shape — multi-shape sum, 7 geometries.

Square Meters Calculator

SI-native m² area calculator with 7 shapes and conversions.

Square Yards Calculator

Area in sq yd — carpet, sod, asphalt with multi-shape support.

Water Flow Rate Calculator

GPM, L/min, m³/h from pipe size + velocity or time-to-fill.

Pipe Volume Calculator

Gallons/liters inside a pipe — system fill, antifreeze, hydraulics.

Refrigerant Line Sizing Calculator

AC/heat pump line set sizing for R-410A/R-32/R-22 — suction + liquid.

Water Velocity in Pipe Calculator

Velocity from flow rate + pipe ID — noise/erosion warnings, Reynolds number.

Window AC BTU Size Calculator

BTU sizing for window AC units based on room size and conditions.

Ice & Water Shield Calculator

Peel-and-stick roofing underlayment for eaves, valleys, low-slope.

Metal Roofing Calculator

Metal panels, trim, fasteners and accessories for a roofing project.

Plywood Sheathing Calculator

4×8 plywood/OSB sheets for roof, wall, floor sheathing with fastener counts.

Roof Snow Load Calculator

ASCE 7 roof snow load PSF for residential/commercial design.

Roofing Material Calculator (Asphalt Shingles)

Bundles of shingles, underlayment, drip edge, ridge cap, nails.

Board and Batten Siding Calculator

Boards + battens + trim for board-and-batten vertical siding.

Clapboard Siding Calculator

Lap siding pieces, exposure, and trim for clapboard projects.

Siding Material Calculator (Universal)

Universal siding calc for vinyl, fiber cement, wood, brick, stucco.

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