01
Evidence path
Plan the work
Connect the right templates, calculators and module records before the job reaches site.
Calculator Hub
Construction calculators for live decisions.
Estimate steel weights, concrete volumes, roof tiles, cable lengths, ductwork, pipe lagging, lift loads, safety exposure, labour cost, markup, delivery capacity and programme duration from one searchable construction tools library.
Construction calculators
Tools hub
Estimate, document and move practical site numbers into controlled Zektrx workflows.36Calculators
15Categories
PDFResult exports
Estimate To Action
Move practical numbers into the work package.
Calculator hubs should feel connected to delivery: estimate the quantity, check the assumption, then carry the result into templates, purchasing, RAMS and job records.
01
Plan the work
02
Control the evidence
03
Brief and close
02
Evidence path
Control the evidence
Keep checks, approvals and site proof attached to the record they support.
03
Evidence path
Brief and close
Turn briefings, actions and reviews into a clear trail for clients and audits.
Calculator Hub In Product
Make each calculation feel ready for the next record.
Calculators are stronger when they do not end at a number. This band connects estimating, materials and evidence back to the operational Zektrx workspace.
1
Estimate Library
36 calculators
2
Materials Check
Materials and labour checks
3
Result Evidence
PDF result exports
Estimate Library
Turn a quick calculation into a scoped work item.
The calculator hub now points from site numbers into the quotes, allowances and records teams manage after the estimate.
Calculator workflow
36 calculators
Materials Check
Keep quantities close to stock and purchasing.
Concrete, steel, roofing and material calculations make more sense when they can feed ordering, stock and job planning.
Calculator workflow
Materials and labour checks
Result Evidence
Carry assumptions into reports and handover.
Estimates become more useful when the assumption, result and next action can be attached to a controlled workflow.
Calculator workflow
PDF result exports
Categories
A scalable tools library.
9 calculators
Steel & Fabrication
Steel Weight Calculator
Estimate steel section weight using length, cross-sectional area and steel density. Free online tool for UK construction and trade teams.
Open calculator
Plate Weight Calculator
Calculate steel plate weight from length, width, thickness and density. Free online tool for UK construction and trade teams.
Open calculator
SHS Weight Calculator
Estimate square hollow section weight using side size, wall thickness and length. Free online tool for UK construction and trade teams.
Open calculator
RHS Weight Calculator
Estimate rectangular hollow section weight from outside dimensions, wall thickness and length. Free online tool for UK construction and trade teams.
Open calculator
CHS Weight Calculator
Estimate circular hollow section weight from diameter, wall thickness and length. Free online tool for UK construction and trade teams.
Open calculator
Angle Iron Weight Calculator
Estimate equal angle steel weight from leg size, thickness and length. Free online tool for UK construction and trade teams.
Open calculator
Flat Bar Weight Calculator
Calculate flat bar weight from width, thickness, length and density. Free online tool for UK construction and trade teams.
Open calculator
Round Bar Weight Calculator
Calculate round bar weight from diameter, length and material density. Free online tool for UK construction and trade teams.
Open calculator
Bolt Quantity Calculator
Calculate bolt counts for repeated rows, plates, brackets and connection schedules. Free online tool for UK construction and trade teams.
Open calculator
3 calculators
Concrete
Concrete Volume Calculator
Calculate concrete volume for slabs, pads and rectangular pours. Free online calculator for UK construction and trade teams — fast estimates, no sign-up.
Open calculator
Concrete Mix Calculator
Estimate cement bags, sand and aggregate volumes for a simple site-mixed concrete ratio. Free online tool for UK construction and trade teams.
Open calculator
Rebar Quantity Calculator
Estimate reinforcement bar count, total length and weight for a simple slab grid. Free online tool for UK construction and trade teams.
Open calculator
1 calculator
Groundworks
1 calculator
Roofing
1 calculator
Electrical
1 calculator
Mechanical
1 calculator
Plumbing
1 calculator
Painting
5 calculators
Health & Safety
Manual Handling Calculator
Create a simple manual handling risk score from load, frequency, distance and twisting. Free online tool for UK construction and trade teams.
Open calculator
Noise Exposure Calculator
Estimate daily noise exposure from sound level and exposure duration. Free online tool for UK construction and trade teams.
Open calculator
HAVS Calculator
Estimate hand-arm vibration A(8) exposure from vibration magnitude and trigger time. Free online tool for UK construction and trade teams.
Open calculator
Ladder Angle Calculator
Check ladder angle and vertical reach using ladder length and wall distance. Free online tool for UK construction and trade teams.
Open calculator
Working at Height Calculator
Screen work-at-height task risk using height, duration, people and control rating. Free online tool for UK construction and trade teams.
Open calculator
1 calculator
Lifting
2 calculators
Site Planning
Waste Skip Calculator
Estimate the number of skips required from waste volume, skip size and fill factor. Free online tool for UK construction and trade teams.
Open calculator
Delivery Capacity Calculator
Estimate delivery capacity from vehicles, trips, capacity per trip and working days. Free online tool for UK construction and trade teams.
Open calculator
5 calculators
Materials
Material Quantity Calculator
Estimate material quantity from area, usage rate and waste allowance. Free online tool for UK construction and trade teams.
Open calculator
Brick Calculator
Estimate brick quantity from wall area, bricks per square metre and waste. Free online tool for UK construction and trade teams.
Open calculator
Block Calculator
Estimate block quantity from wall area, blocks per square metre and waste. Free online tool for UK construction and trade teams.
Open calculator
Plasterboard Calculator
Estimate plasterboard sheet quantity from area, sheet size and waste. Free online tool for UK construction and trade teams.
Open calculator
Insulation Calculator
Estimate insulation pack quantity from area, pack coverage and waste. Free online tool for UK construction and trade teams.
Open calculator
2 calculators
Productivity
Site Labour Cost Calculator
Estimate labour cost from workers, hours, days, hourly rate and burden allowance. Free online tool for UK construction and trade teams.
Open calculator
Fuel Cost Calculator
Estimate vehicle fuel cost from mileage, MPG and fuel price. Free online calculator for UK construction and trade teams — fast estimates, no sign-up.
Open calculator
1 calculator
Project Planning
2 calculators
Quantity Surveying
Markup Calculator
Calculate selling price and profit from cost and markup percentage. Free online tool for UK construction and trade teams.
Open calculator
Profit Margin Calculator
Calculate gross profit and margin from revenue and cost. Free online calculator for UK construction and trade teams — fast estimates, no sign-up.
Open calculator
Connected Tools
Turn estimates into controlled workflows.
Each calculator links to relevant articles, templates, Zektrx software modules, pricing and free-account routes so practical answers can become repeatable records.