Keep the RAW structure intact
Work from the actual tender posts, quantities and units instead of a separate spreadsheet.
ISA Warden extension · For RAW tenders
RAW Calculator for CROW RAW specifications, RSX and NSX
For contractors, estimators and work planners in civil engineering: turn digital RAW tender posts into focused quote requests and compare supplier responses without losing sight of the original specification.
- RSX, NSX and XML input
- Built for construction estimating
Product tour
See how a RAW specification becomes a structured quote project.
Built for the work behind the bid
The specification stays central. The quote process becomes manageable.
RAW tenders contain the structure you need, but turning selected posts into supplier requests and a consistent comparison often means duplicate lists, email threads and manual checks. RAW Calculator brings those steps into one project.
Give every supplier a clear scope
Build focused requests from one source and reduce ambiguity about what is included.
Build a reviewable project record
Keep selections, quote packages and responses together for the people preparing the estimate.
RSX · NSX · CROW RAW
The digital formats around a RAW tender, clearly understood
RAW Calculator fits the tender information contractors already receive. Each format has its own role in the CROW RAW system.
RAW specification exchange
The digital exchange format for RAW specifications, including the structure and besteksposten used in the tender.
Nota van inlichtingen changes
A supported input format for changes issued after questions and answers. Import an NSX later in the process to update the original tender information before final review.
CROW RAW system
The standardized system used for specifications and contracts in Dutch civil engineering and the green sector.
RAW and the RSX exchange specification are managed by CROW. RAW Calculator is an independent ISA Warden extension. Read about RAW RSU/RSX exchange at CROW.
One continuous workflow
From bestekspost to purchasing decision
Keep the scope traceable while the work moves from specification to market response.
- 01
Import the RAW specification
Open the RSX or XML specification, then import any NSX changes issued later, and keep the current tender posts together in one clear project.
- 02
Select the work to quote
Choose the relevant posts for each supplier or subcontractor without rebuilding the list by hand.
- 03
Send focused quote requests
Create a clear package per trade so every invited party receives the right scope.
- 04
Compare on the same basis
Record responses and review offers alongside the selected RAW posts before making a choice.
Project N211 renewalRAW Calculator
QUOTE COMPARISON Road marking package
Supplier AReceived
Supplier BReceived
Supplier CPending
Ready for review
For estimating and work preparation
A shared overview for the team preparing the job
RAW Calculator is designed for construction companies working with RAW specifications: from the first scope selection to the review of supplier and subcontractor offers.
- Work from one structured source
- Keep requests linked to the selected scope
- Review responses before drafting an award
RAW Calculator questions
About RSX, NSX and RAW estimating
Short answers for contractors evaluating the workflow.
What is an RSX file?
RSX is the digital exchange format used for RAW specifications. It lets contractors import the structure and tender posts into compatible estimating and administration software.
What is an NSX file?
NSX is the exchange format for changes issued through a nota van inlichtingen. RAW Calculator supports NSX as an input later in the process, so those changes can be applied to the original specification before the final estimate and quote comparison.
Can I use RAW Calculator with a CROW RAW specification?
RAW Calculator is designed for contractors working with the CROW RAW system. The workflow starts with a digital RSX or XML specification, accepts NSX changes issued later and keeps the selected RAW posts central to supplier requests.
Does RAW Calculator replace RAW estimating software?
No. RAW Calculator complements the estimating process by helping teams select scope, prepare supplier requests, record responses and compare offers.
Built on ISA Warden
A focused extension in a controlled workspace
RAW Calculator runs as an ISA Warden extension and uses extension-owned quote projects, group files and authenticated workspace context. Optional AI enrichment follows the model configuration authorized for the active group.
See it with your own RAW workflow
Make the next quote request easier to prepare and review
Ask for a demonstration of RAW Calculator and discuss how it fits your estimating process.