Tools

Interactive calculators and estimators that show their formulas.

4 pages

Critical Path Method for Programmes: Float, Links and Lags

Worked example of the critical path method across a programme: how links, lags and float move the finish from 19 to 28 weeks, plus a sheet to copy.

Nov 10, 2026

Three Point Estimate Formula: PERT Calculator and Programme Roll-Up

Use the PERT three point estimate formula to get expected cost, standard deviation and a P80 programme total, with a worked ₹ crore example and Excel formulas.

Nov 3, 2026 · 10 min read

Earned Value Formula: Worked Example in ₹ Crore and Programme Roll-Up

Work through the earned value formula in ₹ crore, from CPI and SPI to forecasts, then roll up three projects and test it on 1,981 Indian government projects.

Oct 24, 2026 · 11 min read

Benefit Cost Ratio: Formula, Worked ₹ Crore Example and Check Sheet

Learn how to calculate a benefit cost ratio in ₹ crore, see how discount rate and operating cost placement change it, and stress test it before approval.

Oct 23, 2026 · 9 min read