Project Duration Calculator.
Estimate project duration from work quantity, productivity and crew count.
Connected to Zektrx
Use this result as a planning estimate, then create controlled Zektrx records for tasks, templates, evidence, actions, pricing and delivery.
Instant Results
Estimated duration
5.5days
Duration including non-working allowance.
Net working days
5.0days
Duration before allowance.
Explanation
What this calculates
The calculator divides total work by daily crew output, then applies an allowance for non-working time.
Formula
Days = quantity / (productivity x crews) x (1 + non-working %)
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
1,000 units at 100 units/day with 2 crews and 10% allowance gives 5.5 days.
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Templates
Document the result
Construction KPI Dashboard Starter Guide
Plan dashboard measures for actions, compliance, quality, site records and delivery.
Construction Meeting Minutes Action Log
Use meeting minutes to track owners, decisions, dates and close-out evidence.
Method Statement Template
Plan the safe sequence of work, people, plant, materials, controls and hold points.
Permit to Work Template
Control permit scope, hazards, isolations, approvals, handback and close-out checks.
Software
Turn it into a workflow
Construction Project Management Software
Plan projects, coordinate teams and keep actions, evidence and reports visible.
Construction Scheduling Software
Coordinate schedules, tasks, dependencies and field readiness.
Construction Action Tracking Software
Assign, track and close out actions from audits, inspections and projects.
Construction Management Software
Manage construction work, documents, actions, records and reporting.
Learn before you act.
Workspace Modes vs Paid Plans Guide
Guide to how Zektrx workspace modes change dashboards and workflows while paid plans control capacity and enterprise features.
Construction KPI Dashboard Starter Guide
A starter guide for contractor KPI dashboards covering safety, compliance, quality, programme, cost and action measures.
AI RFI and Change Control Guide for Contractors
A practical guide to using AI to draft RFIs, summarise change context and keep contractor change-control records reviewable.
Construction Meeting Minutes and Action Log Template Guide
Template guidance for construction meeting minutes covering decisions, actions, owners, due dates, evidence and close-out.
Calculator questions.
Does this replace a programme?
No. It is an estimating check. Real programmes need dependencies, access, procurement and resource logic.
Can I use hours instead of units?
Yes, as long as the productivity rate uses the same unit basis.
Next Step
Make estimates part of the job record.
Zektrx connects calculators, templates, articles, evidence, actions, pricing and free trial routes so one-off estimates can become repeatable contractor workflows.