Useful tools.
Open to everyone.
Free calculators, construction references and BIM tools for estimators, quantity surveyors and builders. Find an answer, check your work or explore a better way to estimate.
Free to use, with no signup. Open each tool here on our site.
Estimating tools
Calculate quantities, check scope and prepare your estimate.
Unit converter
Convert metric, imperial and construction units.
Convert unitsEstimator formulas
Find formulas and examples for common estimating tasks.
Use the formulaszzTakeoff Formula Builder
Build and test takeoff formulas, then browse the community library.
Build a formulaEstimating checklists
Review trade scope and potential omissions before pricing.
Check an estimateUnits of purchase
Look up purchasing units for construction materials.
Look up unitsStandard Method of Measurement
Review measurement conventions for quantity surveying.
Read the measurement guideClassification references
Find a code or organise the information in your estimate.
NATSPEC worksections
Search Australian worksection codes in the 2017 reference.
Search worksectionsMasterFormat
Look up specification codes in the 2016 reference.
Find a specification codeUniclass 2015
Browse the UK construction classification tables.
Browse UniclassOmniClass
Review classifications for the built environment.
Browse OmniClassUniFormat II
Find building elements grouped by function.
Find building elementsBIM tools & references
Explore models, properties and information requirements.
IFC Viewer
Open an IFC model in your browser and inspect its elements.
Open the IFC viewerIFC reference
Look up model entities and property sets.
Look up IFC entitiesCOBie reference
Review the structure used for asset-information handover.
Read the COBie referencebuildingSMART Data Dictionary
Search concepts, classifications and attributes in bSDD.
Search bSDDIDS reference
Review Information Delivery Specification requirements.
Read the IDS referenceRegex playground for IDS
Test patterns for construction information and naming.
Test a patternLevel of Development guide
Review the information expected at different LOD levels.
Read the LOD guideDrawing & specification references
Make sense of the information on your drawings.
Get more from your software.
Software comparisons and practical guides, from choosing your next platform to refining an established workflow.
PlanSwift
Training and reusable estimating setups.
zzTakeoff
Cloud takeoff and working together.
Planning & review
Resources to support a considered decision.