Plan the work
Carry the estimate into the job plan.
The useful result is not just the number. It should support owners, programme assumptions and delivery readiness.
Workflow
Length
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.
Connected calculator
Live estimate
Use the result as a planning estimate, then turn it into tasks, templates, evidence and delivery records.4Inputs
2Results
3Trade tags
Estimate In Product
Put the calculation beside the workflow it informs.
Concrete Volume Calculator is a quick way to test the number. Zektrx gives that number a route into planning, materials, evidence and reporting once the work starts moving.
1
Plan the work
Length
2
Check materials
Concrete volume
3
Report the decision
Project Management
Check materials
Turn quantities into stock and purchase context.
Material estimates can connect to stock checks, reservations, purchasing notes and job-linked records.
Workflow
Concrete volume
Report the decision
Keep assumptions visible after the calculation.
Saved outputs can support reports, handover packs, client review and repeatable estimating habits.
Workflow
Project Management
Instant Results
Concrete volume
0.66m3
Estimated concrete volume including waste.
Net volume
0.60m3
Calculated volume before waste.
Estimate To Evidence
Make the result useful beyond the screen.
A calculator result is most useful when it feeds the job plan, material checks and team briefing that follow the estimate.
Measure the work
Use the estimate as a planning input for scope, labour, equipment and site readiness.
Plan materials
Turn quantities into stock checks, purchasing notes and job-linked material records.
Brief delivery
Give teams the assumptions, limits and checks behind the number before work starts.
Explanation
What this calculates
Depth is converted to metres, then multiplied by plan area with a waste allowance.
Formula
Volume = length x width x depth x (1 + waste %)
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
A 6 m x 4 m slab at 150 mm deep with 10% waste needs about 3.96 m3.
Knowledge Journey
Learn, use, then automate.
1. Learn
GuideStock/materials
Construction materials tracking guide
A practical guide to tracking construction materials from supplier and purchase order through delivery, allocation, use and evidence.
GuideStock/materials
Job-linked materials evidence for contractors
How contractors can link materials evidence to jobs, including purchase orders, delivery notes, photos, stock records and completion packs.
GuideStock/materials
Purchase order process for contractors
A practical purchase order process for contractors covering requests, approvals, suppliers, delivery checks and job cost records.
2. Use
CalculatorConcrete
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.
CalculatorConcrete
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.
CalculatorGroundworks
Postcrete Calculator
Estimate postcrete bags for fence posts, signs and small concrete holes. Free online tool for UK construction and trade teams.
3. Automate
Featureactions
Construction Action Tracking Software
Assign, track and close out actions from audits, inspections and projects.
Featurefabrication
Fabrication Management Software
Connect fabrication jobs, materials, drawings, QA and site install evidence.
Featurestructural steel
Structural Steel Contractor Software
Manage structural steel RAMS, drawings, fabrication and install records.
4. Start
Start a Zektrx workflow.
Connect resources, calculators, templates, evidence and software modules around the way your contractor team works with the £5 trial.
Start £5 TrialRelated Content
Connected calculators, templates and workflows.
Related Guides
Keep learning
GuideStock/materials
Construction materials tracking guide
A practical guide to tracking construction materials from supplier and purchase order through delivery, allocation, use and evidence.
GuideStock/materials
Job-linked materials evidence for contractors
How contractors can link materials evidence to jobs, including purchase orders, delivery notes, photos, stock records and completion packs.
GuideStock/materials
Purchase order process for contractors
A practical purchase order process for contractors covering requests, approvals, suppliers, delivery checks and job cost records.
Related Calculators
Run the numbers
CalculatorConcrete
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.
CalculatorConcrete
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.
CalculatorGroundworks
Postcrete Calculator
Estimate postcrete bags for fence posts, signs and small concrete holes. Free online tool for UK construction and trade teams.
Related Templates
Document the work
TemplateSite Diaries
Site Diary Template
Record weather, labour, plant, deliveries, progress, delays, visitors, photos and instructions. Free, editable construction template from Zektrx.
TemplateEquipment Checks
Equipment Pre-use Checklist
Check equipment condition, guards, inspections, certificates, defects and safe use controls. Free, editable construction template from Zektrx.
TemplateITPs
Inspection and Test Plan Template
Define hold points, witness points, acceptance criteria and evidence for quality control. Free, editable construction template from Zektrx.
Related Features
Automate the workflow
Featureactions
Construction Action Tracking Software
Assign, track and close out actions from audits, inspections and projects.
Featurefabrication
Fabrication Management Software
Connect fabrication jobs, materials, drawings, QA and site install evidence.
Featurestructural steel
Structural Steel Contractor Software
Manage structural steel RAMS, drawings, fabrication and install records.
Related Industries
Trade workflows
Industrygroundworks
Groundworkers Software
Groundworks RAMS, permits, site diaries, plant checks, photos, quality records and delay evidence. One platform for documents, evidence and compliance.
Industrysteel fabricators
Steel Fabricators Software
RAMS, drawings, workshop records, install evidence and handover workflows for steel fabricators. One platform for documents, evidence and compliance.
Industryprincipal contractors
Principal Contractors Software
Principal contractor hubs for subcontractor coordination, RAMS, permits, site records, actions and audit evidence.
Related Comparisons
Compare options
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Best Construction Management Software
A construction management software buyer guide for teams comparing project controls, site records, documents, compliance and contractor operations.
ComparisonProcore
Zektrx vs Procore
Compare Zektrx with Procore for contractors that need RAMS, site evidence, document control and day-to-day trade operations without enterprise complexity.
ComparisonSpreadsheets
Zektrx vs Spreadsheets
Compare Zektrx with spreadsheet-based construction admin for RAMS, site records, document control, actions, stock and reporting.
Related FAQs
Is 1.54 always correct?
It is an estimating factor for dry ingredients. Follow supplier and engineer requirements for actual works.
From Concrete Mix Calculator
Can I use ready-mix instead?
For many structural pours, ready-mix with a specified grade is the safer procurement route.
From Concrete Mix Calculator
Does this design reinforcement?
No. It estimates quantities only. Reinforcement must follow engineering design.
From Rebar Quantity Calculator
Does it include laps and bends?
Only through the waste allowance. Add project-specific laps, bends and chairs separately.
From Rebar Quantity Calculator
FAQ
Calculator questions.
How much waste should I allow?
Many small pours use 5-10%, but site conditions, irregular excavations and delivery risk can change this.
Does this design the concrete mix?
No. It estimates volume only. Use project specifications for concrete grade and design.
Next Step
Start a Zektrx workflow.
Connect resources, calculators, templates, evidence and software modules around the way your contractor team works with the £5 trial.