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Free construction calculators

Construction Toolkit

Date calculators built for construction professionals — project timelines, concrete cure milestones, and permit tracking, all in one place.

📋Planning tool disclaimer: Results are general planning estimates and should not be considered engineering, architectural, legal, permitting, inspection, or construction advice. Always verify project requirements against applicable plans, specifications, manufacturer instructions, building codes, permit requirements, and direction from qualified professionals or the appropriate Authority Having Jurisdiction (AHJ).

Project Timeline

Project phases

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Timeline results are planning estimates and do not guarantee actual project completion dates.

Start date
Oct 23, 2026
Completion date
Feb 4, 2027
Total calendar days
104
Phases
9
Timeline
Preconstruction / PermittingOct 23 – Nov 6, 2026 · 14d cal / 10d work
Mobilization & Site PreparationNov 6 – Nov 16, 2026 · 10d cal / 5d work
Excavation & FoundationNov 16 – Nov 30, 2026 · 14d cal / 9d work
FramingNov 30 – Dec 14, 2026 · 14d cal / 10d work
Rough-In (Electrical, Plumbing, HVAC)Dec 14 – Dec 29, 2026 · 15d cal / 10d work
Inspections & ApprovalsDec 29 – Jan 5, 2027 · 7d cal / 5d work
Insulation & DrywallJan 5 – Jan 14, 2027 · 9d cal / 7d work
Interior FinishesJan 14 – Jan 28, 2027 · 14d cal / 10d work
Punch List & Final InspectionJan 28 – Feb 4, 2027 · 7d cal / 5d work
PhaseStartEndCal. daysWork days
Preconstruction / PermittingOct 23, 2026Nov 6, 20261410
Mobilization & Site PreparationNov 6, 2026Nov 16, 2026105
Excavation & FoundationNov 16, 2026Nov 30, 2026149
FramingNov 30, 2026Dec 14, 20261410
Rough-In (Electrical, Plumbing, HVAC)Dec 14, 2026Dec 29, 20261510
Inspections & ApprovalsDec 29, 2026Jan 5, 202775
Insulation & DrywallJan 5, 2027Jan 14, 202797
Interior FinishesJan 14, 2027Jan 28, 20271410
Punch List & Final InspectionJan 28, 2027Feb 4, 202775

Scheduling reminder: Some construction activities cannot begin until preceding work, inspections, approvals, material deliveries, or required curing periods are complete. This tool does not determine construction sequencing — verify phase dependencies with your project team and applicable professionals.

Frequently asked questions

How does the construction project timeline calculator work?

Enter your project start date and define each phase with a name and duration. Toggle "workdays only" per phase to skip weekends and holidays. The calculator generates start/end dates for every phase and renders a Gantt-style bar chart with a CSV export.

How long does concrete take to cure?

Concrete curing timelines are general planning estimates — not guaranteed strength or load-bearing determinations. Common reference milestones for standard Portland cement concrete include approximately 24–48 hours for early foot traffic under suitable conditions, 7 days as a general intermediate reference, and 28 days as a common reference age for specified compressive strength. Actual strength development depends on mix design, temperature, curing conditions, cement type, admixtures, moisture, slab thickness, and required strength. Always follow project specifications and applicable testing requirements when determining whether concrete is ready for a particular load or construction activity.

How long is a building permit valid?

Permit validity periods vary by jurisdiction and permit type — local rules control. Common reference periods used for planning purposes are 12 months for building permits and 6 months for electrical, plumbing, and mechanical permits, but these are general defaults only. Use the permit scheduler as a planning aid and verify the actual expiration, renewal, and inspection requirements with the applicable permitting authority.

Are these construction calculators free?

Yes, completely free. All calculations run in your browser — no account, no subscription, no data sent to any server.