Project and variation
Used on screen and on the printed sheet only.
The project as it stands
Before this variation. Everything already approved belongs in these two figures.
Original contract plus every variation already approved.
What the job is now forecast to cost, without this change.
Forecast profit and margin are worked out from these two rather than typed, so the position this variation is being added to is always the one your own figures produce.
The variation
What was asked for, and what you expect to be approved.
Not used as revenue.
The revenue side of the change.
What delivering it costs
Everything the change adds, over and above what was already priced.
Materials and labour for the varied work itself.
What subcontractors will charge on top of their existing scope.
Extra establishment, supervision, welfare and site running cost.
Hire, fuel, mobilisation and running cost the change brings with it.
Interest or facility cost of funding the change until it is paid.
Time and programme
What the change does to the programme, and what those extra days cost.
Days the variation adds to the programme.
Site presence, supervision, welfare, security and standing plant, per day.
Approval likelihood
Optional. Used for scenario analysis only, and for nothing in the three columns.
The three positions work without this. Add it to see the approval chance at which proceeding is worth nothing on your own figures.
Variation contribution
Enter the variation and the project it sits in
This calculator needs an expected approved value, or the cost of delivering the change, before it can say anything.
What you will get
Fill in the variation's expected value and what it costs to deliver, and the answer appears here as you type.
- What the variation contributes, and the margin it runs at
- What it does to the project's contract value, cost, profit and margin
- What you are carrying if the work proceeds and the value is never approved
- What the extra days on the programme cost, priced rather than assumed
- The approval chance at which proceeding is worth nothing
Managing variations across a live project?
This calculator evaluates one change. A project carries a register of them.
OraOS Construction connects variations to contract value, BOQ, cost, programme, certificates and project profitability, so every change moves the project's position as it happens rather than being modelled once and typed again next month.
- A variation register, from instruction through to certification
- Contract value that moves as variations are approved
- Cost and programme impact carried into the project forecast
- Margin across every job, not one change at a time
A separate product, with its own pricing and its own pilot. This calculator stays free either way.
Ora Account
Coming soonSave variations, compare results and reopen your work across Ora Tools when the Ora Account launches. It will be free.
Nothing on this page asks you to sign in, and nothing you enter leaves your browser today.
What the account will doOra Tools Pro
Coming soonSaved variations, a register across a whole project, partial approval and negotiated settlement scenarios, comparison between variations, and export to PDF and spreadsheet are intended for Pro.
None of it exists yet, and no price has been set. The calculation on this page is complete and free, and will stay that way.
Free and Pro, comparedYour figures run in your browser. What you enter, including the value you expect to settle a variation at and the cost of delivering it, is never sent to Ora, and is kept only in this browser so that a refresh does not lose it. Clearing the form removes it. Like any website, Ora Tools counts anonymous page views, which carry nothing you typed.