📚 Construction calculators

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The construction calculators cluster covers field and project-controls math: percent complete, punch list completion rate, RFI response rate, safety TRIR, change-order percentage, bid win rate, contingency used percentage, weather delay percentage, crew utilization rate, material waste percentage, subcontract retention, inspection pass rate, field labor overtime, schedule delay days rate, cost overrun percentage, field equipment utilization, concrete yield, and lost-time injury rate—each on a single-intent URL. Earned-value SPI and CPI live on the Professional hub.

Run construction progress and controls math in one place: percent complete from progress ÷ planned quantity, punch list and RFI response rates, OSHA-style safety TRIR, change-order percentage vs original contract, bid win rate, contingency used, weather delay share of planned workdays, crew utilization, and material waste—plus Wave 2 tools for subcontract retention (retainage), inspection pass rate, field labor overtime %, schedule delay days rate, cost overrun %, field equipment utilization, concrete yield, and lost-time injury rate (LTIR). Keep WBS, contract, and safety definitions identical to the calculator labels. Earned-value SPI and CPI live on the Professional hub—use them alongside physical % complete and simple overrun %, not as substitutes.

Key facts

Primary audience Project controls, supers, estimators, safety leads, and construction PMs
Core formulas % complete, punch/RFI, TRIR/LTIR, change-order %, retainage, inspection pass, OT %, delay %, overrun, equipment util, concrete yield, waste %
Category Construction / project controls / field / safety
Related hubs Professional KPIs (SPI/CPI); Manufacturing; Business

Definitions

Percent complete

Progress achieved ÷ planned quantity × 100 for the same activity or WBS—physical or earned quantity, not necessarily EV SPI.

Safety TRIR / LTIR

TRIR counts recordable incidents; LTIR counts lost-time injuries—both often use (count × 200,000) ÷ hours worked. Pair them on safety scorecards.

Subcontract retention

Retainage held ÷ subcontract billed × 100—cash held back on pay apps, not punch-list completion.

Cost overrun %

(Actual − budget) ÷ budget × 100—simple budget variance. Distinct from CPI/CV earned-value formulas on the Professional hub.

Formulas

  • Percent complete %: (progress achieved ÷ planned quantity) × 100
  • Punch list completion %: (closed items ÷ total items) × 100
  • RFI response rate %: (RFIs answered in SLA ÷ RFIs issued) × 100
  • Safety TRIR: (recordable incidents × 200,000) ÷ hours worked
  • Change-order %: (change-order value ÷ original contract) × 100
  • Bid win rate %: (awards ÷ bids submitted) × 100
  • Contingency used %: (contingency spent ÷ contingency budget) × 100
  • Weather delay %: (weather delay days ÷ planned workdays) × 100
  • Crew utilization %: (productive hours ÷ available hours) × 100
  • Material waste %: (waste quantity ÷ issued quantity) × 100
  • Subcontract retention %: (retention held ÷ subcontract billed) × 100
  • Inspection pass rate %: (passed inspections ÷ total inspections) × 100
  • Field labor OT %: (overtime hours ÷ total field hours) × 100
  • Schedule delay %: (delay days ÷ planned workdays) × 100
  • Cost overrun %: ((actual − budget) ÷ budget) × 100
  • Field equipment utilization %: (operating hours ÷ available hours) × 100
  • Concrete yield %: (placed volume ÷ batched volume) × 100
  • Lost-time injury rate: (lost-time injuries × 200,000) ÷ hours worked

Comparison table

Topic Guidance
Percent complete vs SPI Percent complete is progress÷planned quantity; SPI is earned value ÷ planned value—EV tools live on the Professional hub.
Punch list vs RFI response Punch list completion is closed deficiency items; RFI response rate is answers within SLA vs RFIs issued.
TRIR vs LTIR TRIR counts recordable incidents; LTIR counts lost-time injuries only—report both on the same hours base.
Change-order % vs contingency used Change orders measure contract growth; contingency used measures burn of a reserved budget—different bases.
Cost overrun % vs CPI Overrun is actual vs budget; CPI is EV cost performance (earned÷actual)—do not treat them as interchangeable.
Schedule delay % vs weather delay % Schedule delay can include all causes; weather delay % is weather-only days÷planned workdays.
Inspection pass vs punch completion Pass rate is inspections accepted; punch completion is deficiency items closed afterward.
Crew vs field equipment utilization Crew utilization is labor productive÷available; equipment utilization is machine operating÷available hours.
Bid win vs close rate (insurance) Bid win is awards÷bids in construction; agency close/quote-to-bind lives on the Insurance hub.
Material waste vs concrete yield Waste is waste÷issued; concrete yield is placed÷batched volume—different materials-control stories.

Glossary references

Reinforce entities by pairing percent language with conversion pages when learners mix fractions, decimals, and ratios.

❓ Frequently Asked Questions

Is percent complete the same as SPI?

No. This hub’s percent complete is progress÷planned quantity. SPI (earned÷planned value) and CPI live on the Professional hub.

How do TRIR and LTIR relate?

Both often use the 200,000-hour scale. TRIR counts recordables; LTIR counts lost-time injuries only—pair them on safety scorecards with the same hours base.

Is cost overrun the same as CPI?

No. Overrun % is (actual − budget) ÷ budget. CPI uses earned value ÷ actual cost on the Professional hub—different formula families.

Is schedule delay the same as weather delay?

No. Weather delay % is weather-only. Schedule delay days rate uses total (or labeled) delay days÷planned workdays.

What did Wave 2 add for retainage, inspection, overrun, and LTIR?

Subcontract retention %, inspection pass rate, field labor OT %, schedule delay days rate, cost overrun %, field equipment utilization, concrete yield %, and lost-time injury rate.

Do these replace project-controls or OSHA systems?

No. They compute educational formulas from your inputs—P6/Primavera extracts, safety logs, and contract documents remain authoritative.