A size chart gives geometry and mass; a supplier quote gives a selling price for a defined order. Combining them into an undated price list hides important differences in fabrication and delivery. The unsupported per-section prices formerly shown here have been withdrawn.
Read the section before comparing its price
The manufacturer-sourced chart lists actual dimensions and mass. For instance, the nominal 25 in 203×133×25 corresponds to a listed mass of 25.1 kg/m. A 4.3 m cut length therefore contains 107.93 kg of theoretical bare steel. That calculation does not determine the retail price or the weight of welded fittings.
Normalize the quote units
A quote per metre must use the charged length. A quote per kilogram needs the supplier’s chargeable mass basis. A fabricated lump sum may already include cutting and plates; adding those again would overstate the total. Keep each supplier’s original unit and show your conversion alongside it.
Use the quote calculator only after you have a net per-metre rate for the chosen section. Delivery is entered once for the whole order, and other project costs are entered gross.
Do not optimize the design by price alone
Ask the engineer whether an alternative is acceptable before seeking a revised quotation. Changes can affect restraint, connections, ceiling clearance and handling as well as weight. The British Steel datasheet supports product identification, not substitution approval.