Project lists
From Net Quantity to a Shopping List
Follow a measured quantity through a chosen allowance and whole-pack rounding, and learn what to check on the final shopping list.
Read the guideGuides
Practical notes for the gap between a measurement and a purchase.

Project lists
Follow a measured quantity through a chosen allowance and whole-pack rounding, and learn what to check on the final shopping list.
Read the guideProject lists
Follow a measured quantity through a chosen allowance and whole-pack rounding, and learn what to check on the final shopping list.
Read the guideConcrete
Compare bagged and bulk material quantities without assuming prices, delivery terms, package capacities or a universal density.
Read the guideTile, flooring & drywall
See why a small change in your selected allowance can add a whole package, and keep that purchasing effect separate from the material need.
Read the guidePaint & wallpaper
Identify the coverage, unit, coat basis and can capacity needed for a paint estimate without relying on a generic coverage default.
Read the guidePaint & wallpaper
Measure doors and windows for a paint estimate without standard-size guesses, duplicated deductions or openings assigned to the wrong surface.
Read the guidePaint & wallpaper
See how wallpaper trimming and pattern repeats affect usable strips and the final roll, without relying on an area-only estimate.
Read the guideTile, flooring & drywall
Compare flooring cartons by actual coverage and whole-pack quantity instead of assuming every box represents the same amount.
Read the guideLandscaping
Identify metric tonnes and US short tons before comparing bulk-material quantities or copying a supplier’s mass quote.
Read the guideLandscaping
Keep a useful volume estimate when material density is unknown, and ask the supplier for the information needed before calculating weight.
Read the guideTile, flooring & drywall
Understand why equal material area can produce different fitting needs, and why tile, flooring and sheet estimates do not guarantee a cutting plan.
Read the guideProject lists
Use a practical checklist to review measurements, product specifications, units, allowances and exports before buying materials.
Read the guideLearn how to record openings, separate surfaces and keep units attached to dimensions. A clear input is more useful than a long result with no explanation.
Read about allowance, whole-pack rounding, product coverage and supplier units. These guides explain decisions you can check with your own project and product information.
Use the final-order checklist to compare your measurements, specifications and exports. The tools prepare quantities; they do not place orders or choose a construction specification.
Original derivations using geometry, ratios, sums and whole-package rounding. Each calculator explains its assumptions and worked examples.
Instructions for the calculators, browser-local projects, user prices and downloadable project records.