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
Number of holes
Groundworks
Postcrete Calculator.
Estimate postcrete bags for fence posts, signs and small concrete holes. 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
2Results
3Trade tags
Estimate In Product
Put the calculation beside the workflow it informs.
Postcrete 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
Number of holes
2
Check materials
Postcrete bags
3
Report the decision
Site Operations
Check materials
Turn quantities into stock and purchase context.
Material estimates can connect to stock checks, reservations, purchasing notes and job-linked records.
Workflow
Postcrete bags
Report the decision
Keep assumptions visible after the calculation.
Saved outputs can support reports, handover packs, client review and repeatable estimating habits.
Workflow
Site Operations
holes
mm
mm
m3
%
Instant Results
Postcrete bags
30bags
Rounded bag count including waste.
Concrete volume
0.32m3
Estimated fill volume including 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
Hole dimensions are converted from millimetres to metres before calculating cylindrical volume.
Formula
Volume = holes x pi x radius2 x depth; bags = volume / yield per bag
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
Ten 250 mm diameter holes at 600 mm deep need about 30 x 20 kg bags at 0.011 m3 yield.
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
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.
CalculatorSite 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.
3. Automate
Featurefacilities management
Facilities Maintenance Software
Track planned and reactive maintenance records, actions and evidence.
Featurefacilities management
Facilities Management Software
Coordinate maintenance, permits, service evidence, assets and reporting.
Featurefabrication
Fabrication Management Software
Connect fabrication jobs, materials, drawings, QA and site install evidence.
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
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.
CalculatorSite 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.
Related Templates
Document the work
TemplateEquipment Checks
Equipment Pre-use Checklist
Check equipment condition, guards, inspections, certificates, defects and safe use controls. Free, editable construction template from Zektrx.
TemplateRisk Assessments
Construction Risk Assessment Template
Identify hazards, people at risk, existing controls, further actions and review dates. Free, editable construction template from Zektrx.
TemplateHR Forms
Employee Induction Form
Record worker details, company policies, site rules, competence checks and sign-off. Free, editable construction template from Zektrx.
Related Features
Automate the workflow
Featurefacilities management
Facilities Maintenance Software
Track planned and reactive maintenance records, actions and evidence.
Featurefacilities management
Facilities Management Software
Coordinate maintenance, permits, service evidence, assets and reporting.
Featurefabrication
Fabrication Management Software
Connect fabrication jobs, materials, drawings, QA and site install evidence.
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
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RAMS, drawings, workshop records, install evidence and handover workflows for steel fabricators. One platform for documents, evidence and compliance.
Industryelectrical
Electrical Contractors Software
Electrical contractor RAMS, permits, testing evidence, drawings, site records and handover packs. One platform for documents, evidence and compliance.
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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
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
FAQ
Calculator questions.
Should I account for the post volume?
For tighter estimates deduct the post volume, but many site orders keep the allowance for tolerance and spillage.
Does this apply to structural foundations?
No. Use engineered concrete specifications for structural work.
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.