Skip to content

All toolsCalculatorsContractor ToolsLoss & Expense (Hudson / Emden / Eichleay)

Loss & Expense (Hudson / Emden / Eichleay)

Compare head-office overheads and profit claims for prolongation using the Hudson, Emden and Eichleay formulas, plus a simple prelims build-up.

Contract Basis (Hudson & Emden)

£
weeks
weeks

Used by Hudson, Emden and the prelims build-up

Overheads & Profit %

%

Hudson basis — % priced at tender

%

Emden basis — % from audited accounts

Eichleay — Billings & Overhead

£

Billed on this contract during the actual period

£

Whole business, same period

£

Whole business, same period

days

Actual performance, inclusive of delay

days

Eichleay's own delay unit — days, not weeks

Simple Prolongation Build-Up

£/wk

A non-formula comparator: prelims rate × delay weeks

Enter the contract sum and period to calculate the Hudson and Emden claims
ensign.software · 28 October 2026The Ensign Toolbox