Project Engineering & Project Controls Calculators

Practical construction calculators for project engineers, planners, quantity surveyors, procurement teams and MEP/piping professionals. Start with simple project inputs and progress into productivity, earned value, forecasting, procurement and commercial controls.

01 · PLANNING

Project Duration & Working Days Calculator

Convert calendar dates into practical working days after considering the selected weekly work pattern.

Step 1 — Select dates and workweek

Start date

Finish date

Working days/week

Calendar Days—

Working Days—

Non-working Days—

Working days are counted inclusively. Public holidays are not deducted in this version.

02 · RESOURCE PLANNING

Manpower, Productivity & Duration Calculator

Useful for piping, welding, fabrication, civil, MEP and repetitive construction activities.

Step 1 — Define the work

Total quantity

Productivity / worker / day

Available workers

Target duration (days)

Crew Daily Output—

Duration with Current Crew—

Workers for Target—

Total Worker-Days—

Duration = Quantity ÷ (Workers × Productivity). Required workers = Quantity ÷ (Target days × Productivity).

03 · PROJECT CONTROLS

Earned Value Management — Basic to Advanced

Begin with familiar percentages, then automatically obtain PV, EV, schedule/cost indices and final project forecasts.

Step 1 — Simple project status

Budget at Completion (BAC)

Planned progress %

Actual physical progress %

Actual Cost to Date (AC)

Step 2 — Earned value & variance

Planned Value (PV)—

Earned Value (EV)—

Schedule Variance (SV)—

Cost Variance (CV)—

Step 3 — Performance indices

SPI = EV / PV—

CPI = EV / AC—

Schedule Status—

Cost Status—

Step 4 — Forecast at completion

EAC (CPI basis)—

ETC—

VAC—

TCPI to BAC—

PV = BAC × planned %. EV = BAC × actual physical %. SV = EV − PV. CV = EV − AC. SPI = EV/PV. CPI = EV/AC. EAC = BAC/CPI. ETC = EAC − AC. VAC = BAC − EAC. TCPI = (BAC − EV)/(BAC − AC).

04 · RECOVERY PLANNING

Project Delay Recovery Calculator

Estimate the output and manpower required to complete remaining work within a recovery period.

Total quantity

Completed quantity

Remaining target days

Productivity / worker / day

Current workers

Remaining Quantity—

Required Daily Output—

Required Workers—

Additional Workers—

05 · PIPING CONSTRUCTION

Piping & Welding Progress Planner

Convert pipe joints into diameter-inch workload and estimate welding duration, manpower and NDT quantities.

Step 1 — Welding workload

Pipe nominal diameter (inch)

Total butt weld joints

Completed joints

Number of welders

Joints / welder / day

NDT requirement %

Total Dia-Inch—

Remaining Joints—

Estimated Remaining Days—

NDT Joints—

Simplified diameter-inch = nominal pipe diameter (in.) × number of circumferential butt-weld joints. Actual productivity depends on thickness, material, welding process, access, position, WPS, fit-up and inspection requirements.

06 · PROCUREMENT

Latest PO / Material Order Date Calculator

Work backward from the required-on-site date through shipping, manufacturing, approvals and procurement processing.

Required on site date

Shipping / delivery days

Manufacturing lead days

Submittal / approval days

RFQ / PO processing days

Contingency days

Total Procurement Lead Time—

Latest Procurement Start—

07 · MATERIAL CONTROL

Safety Stock & Reorder Point Calculator

Estimate stock required to cover normal consumption, procurement lead time and a selected safety allowance.

Average daily consumption

Lead time (days)

Safety stock (days)

Current stock

Lead-Time Demand—

Safety Stock—

Reorder Point—

Current Stock Coverage—

08 · VENDOR EVALUATION

Weighted Supplier Evaluation Calculator

Compare a supplier using technical, commercial, delivery and quality criteria. Scores are entered from 0 to 100.

Technical score (35%)

Commercial score (30%)

Delivery score (20%)

Quality / warranty score (15%)

Overall Weighted Score—

Indicative Rating—

Weights should be adjusted to suit the project's approved vendor evaluation procedure.

09 · ESTIMATION

Construction Unit Rate & Selling Price Calculator

Build a unit rate from labour, material, equipment and subcontract costs, then add overhead, contingency and profit.

Labour cost

Material cost

Equipment cost

Subcontract / other

Overhead %

Contingency %

Profit markup %

Quantity / units

Direct Cost—

Cost incl. OH & Contingency—

Selling Price—

Selling Unit Rate—

10 · COMMERCIAL CONTROL

Progress Billing / IPC Calculator

Estimate a simplified interim payment from contract value and certified progress after retention, advance recovery and previous certificates.

Contract value

Certified progress %

Retention %

Advance recovery this IPC

Previously certified

VAT %

Gross Work Value—

Retention—

Current Net Before VAT—

Current Amount incl. VAT—

This is a simplified planning calculator. Actual IPC valuation must follow the contract's rules for retention, advance recovery, materials on site, variations, deductions and tax.

BONUS · PROJECT CONTROLS

Simple S-Curve Progress Visualizer

Enter cumulative planned and actual progress values to visualize schedule movement without loading an external chart library.

Planned cumulative % (comma separated)

Actual cumulative % (comma separated)

For formal project controls, monthly or weekly time-phased budget data should be used rather than assuming progress percentages alone.

Need Project-Specific Engineering Support?

For piping, district cooling, MEP, construction planning, estimation or project engineering assistance, contact the PSEMIC engineering team.

Get Expert Advice from PSEMIC

Engineering note: These calculators are preliminary planning and estimation aids. Verify results against approved drawings, specifications, contracts, codes, manufacturer data, WPS/PQR, project procedures and site conditions before execution.