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
Wet concrete volume
Concrete
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.
Connected calculator
Live estimate
Use the result as a planning estimate, then turn it into tasks, templates, evidence and delivery records.5Inputs
3Results
3Trade tags
Estimate In Product
Put the calculation beside the workflow it informs.
Concrete Mix 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
Wet concrete volume
2
Check materials
Cement bags
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
Cement bags
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
m3
parts
parts
parts
kg
Instant Results
Cement bags
12.7bags
Estimated cement bags.
Sand
0.44m3
Estimated dry sand volume.
Aggregate
0.88m3
Estimated dry aggregate volume.
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
A dry-volume factor is applied before dividing the material quantities by the selected mix parts.
Formula
Dry volume = wet volume x 1.54; split dry volume by mix ratio
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
For 1 m3 at 1:2:4, expect roughly 12.7 x 25 kg cement bags, 0.44 m3 sand and 0.88 m3 aggregate.
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 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.
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
Featureproject management
Construction Project Management Software
Plan projects, coordinate teams and keep actions, evidence and reports visible.
Featurescheduling
Construction Scheduling Software
Coordinate schedules, tasks, dependencies and field readiness.
Featureactions
Construction Action Tracking Software
Assign, track and close out actions from audits, inspections and projects.
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 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.
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
Featureproject management
Construction Project Management Software
Plan projects, coordinate teams and keep actions, evidence and reports visible.
Featurescheduling
Construction Scheduling Software
Coordinate schedules, tasks, dependencies and field readiness.
Featureactions
Construction Action Tracking Software
Assign, track and close out actions from audits, inspections and projects.
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.
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Related FAQs
How much waste should I allow?
Many small pours use 5-10%, but site conditions, irregular excavations and delivery risk can change this.
From Concrete Volume Calculator
Does this design the concrete mix?
No. It estimates volume only. Use project specifications for concrete grade and design.
From Concrete Volume 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.
Is 1.54 always correct?
It is an estimating factor for dry ingredients. Follow supplier and engineer requirements for actual works.
Can I use ready-mix instead?
For many structural pours, ready-mix with a specified grade is the safer procurement route.
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.