Trade calculators, one drawer
Type what you are measuring and the list narrows to it. Every tool takes metric or imperial, updates as you type, and gives you a number you can order from.
97 tools
Vos plus utilisés
Organise my tools — pin, order, hide, make lists
New here? Start with…
Three tools per trade, in the order I would hand them to a first-year. Each track on the start page adds a practice problem per step.
-
Concrete & site
Follow the track → -
Framing & finish
Follow the track → -
Electrical basics
Follow the track →
Béton et maçonnerie
- Concrete yards, bags & volume from slab dimensions
- Concrete slab yards & bags for a floor, pad or patio
- Concrete footing yards & bags for strip and pad footings
- Concrete column yards & bags for round piers and sonotubes
- Post hole concrete bags per hole, net of the post, for a run of posts
- Concrete stairs concrete volume for poured steps
- Concrete bags bag count from a volume or dimensions
- Rebar grid count, linear length & ties
- Block wall concrete block count for a wall
- Brick brick count for a wall area
- Mortar bags of mortar for block or brick
- Concrete wall yards & m³ for a poured wall, less openings
- Concrete weight weight of a slab, block or pour from your density
- Rebar spacing bars in a run at your spacing, with laps
Charpente et menuiserie
- Stairs riser count, riser & tread size, stringer length
- Stair stringer layout every mark and cut on the board, printable
- Board feet board footage of rough or dimensional lumber
- Studs stud count & plate length for a wall
- Joist spacing joist count & spacing to fill an opening
- Deck boards decking rows, boards & linear feet
- Deck footing layout posts, beams and where every footing goes
- Rafter length common rafter cut length from run & pitch
- Hip & valley rafter hip length, hip plumb cut & jack difference
- Crown molding miter & bevel for any corner and spring angle
- Roofing squares & bundles from footprint and pitch
- Wall framing studs, plates, header length & sheathing for a wall
- Shed framing and sheet materials list for a gable shed
- 3-4-5 square diagonal to prove a square corner
- Right triangle solve sides & angle from any two
- Lumber weight weight of a board or stack for handling
- Plywood sheets sheet count for a surface area
- Baluster spacing even spindle layout under your max gap
- Miter angle cut angles for any number of sides or corner
- Linear feet linear ft ↔ board feet ↔ square feet
- Metal roofing panels, lengths & screws from coverage width
Terrain et aménagement
- Gravel tonnes or yards of gravel for an area
- Mulch yards or bags of mulch by depth
- Topsoil yards or tonnes of soil by depth
- Asphalt tonnes of hot-mix for a paved area
- Sand tonnes or yards of sand by depth
- Fence posts, rails & pickets for a run
- Retaining wall block, cap & base-gravel takeoff
- Excavation dig volume, spoil swell & tonnage
- Slope & grade grade %, angle, ratio & drop
- Ramp slope ramp length & run from rise and the ratio you enter
- Trench dig, bedding, backfill & spoil for a pipe or cable run
- Cut & fill cut, fill & net import or export
- Pavers pavers, base gravel & bedding sand for a patio
- Sod rolls, slabs & pallets for a lawn
Finitions et intérieur
- Drywall sheets of drywall for walls and ceilings
- Paint litres or gallons of paint by coats
- Tile tiles & boxes for a floor or wall
- Flooring boxes of flooring for a room
- Baseboard linear length & pieces for a room
- Insulation bags or batts for an area
- Wallpaper rolls for a wall, with pattern repeat
- Grout grout volume & bags from tile & joints
- Siding squares & pieces for the walls, less openings
- Floor leveler bags of self-leveller for an area & depth
- Caulk tubes for a joint length & size
Mesure et tracé
Électricité
- Voltage drop volts & % lost over a cable run
- Ohm's law volts, amps, ohms & watts from any two
- Motor amps running current from horsepower
- kVA apparent power & amps, 1 or 3 phase
- Conductor derating corrected ampacity for heat & bundling
- Conduit fill fill % against the limit from your code book
- Wire resistance ohms of a run from size, length & resistivity
- Electricity cost kWh and running cost per day, month & year
Plomberie et CVC
- Pipe volume gallons or litres a pipe holds
- Pipe offset travel and cut length for 45°, 22½° and other fittings
- Gutter & downspouts roof runoff and how many downspouts
- Tank volume full or part-full cylinder capacity
- Pump GPM flow rate from a bucket test or pipe
- Duct CFM airflow from area & velocity or ACH
- Duct size round and rectangular size from your friction rate or velocity
- BTU / room heat heating or cooling load from your own factors
- Pool volume gallons or litres in a pool or pond
Atelier et équipement
- Mélange 2 temps l’huile pour un rapport comme 50:1
- Conversion de couple ft·lb, in·lb, N·m et kgf·m
- Vitesse de perçage RPM selon la vitesse de coupe et le diamètre
- Rapport d’engrenage rapport, vitesse de sortie et couple
- Poids de l’acier poids d’une barre, d’une plaque, d’un tube ou d’une cornière
- Force d’un vérin poussée et traction selon l’alésage et la pression
- Majoration et marge le prix d’un contrat à partir du coût et d’une majoration ou d’une marge
Conversions
- All converters the unit-conversion hub in one place
- Units & fractions tape chart in sixteenths and exact unit factors
- mm to inches millimetres ↔ inches, with a tape fraction
- psi to kPa psi ↔ kPa ↔ bar
- AWG to mm² wire gauge ↔ area & diameter
- Cubic yards to tons volume ↔ weight by material density
- Fraction to decimal inch fractions ↔ decimal inches
- Degrees to % slope angle ↔ grade % ↔ ratio
No tool matches that yet. More calculators are on the way — try a broader word like “concrete”, “area” or “gravel”.
The whole drawer is open: concrete and masonry, framing, site and landscape, finishes, electrical, plumbing and HVAC, shop tools, and a full conversion hub. Type a word above and the list narrows to it. Doing conduit bending? That belongs on its own site — bentright goes deep on it.
Des calculateurs qui vont avec votre travail — par courriel, facultatif
Laissez votre courriel et cochez la case : au plus une courte note toutes les deux semaines, avec des calculateurs liés à ceux que vous utilisez — ici et sur bentright.com et sparkytools.net. Une seule liste pour les trois, désabonnement en un clic, et rien n’est envoyé avant que vous confirmiez depuis votre boîte de réception.