A clear model.
Visible assumptions.

OpenDoor calculates thirteen weekly cash balances in US dollars using inputs you supply. It is a planning model, not a prediction of construction effects or a substitute for professional advice.

Cash at the end of each week

Opening cash + sales receipts + other receipts − variable costs − recurring expenses − one-time expenses − action costs. Each cash amount is rounded to cents before it is added or subtracted.

Receipts and costs

Normal sales use the same weekly baseline across all thirteen weeks. Sales are assumed to be collected in the week they occur, and variable costs are paid that week. Weekly expenses occur once in every modeled week. Monthly expenses occur on the day you select; dates such as the 31st move to the last day of shorter months. Add taxes, loan payments, inventory purchases, receivables or other irregular cash movements as dated one-time events. Do not count the same expense twice.

Disruption and recovery

The sales reduction applies for your selected duration, beginning in the selected week. During recovery, the reduction steps down evenly: with a 30% reduction and two recovery weeks, losses are 20%, then 10%, then zero. Losses beyond week thirteen are outside the visible horizon.

Your action plan

Recovered sales are a percentage of the sales lost to the scenario, not a percentage of normal revenue. Recovering 40% of a 30% sales loss leaves an 18% reduction. Variable costs apply to recovered sales too. Weekly action spending continues through the disruption and recovery periods; setup spending occurs in the first disruption week. Costs still apply if you set the sales loss to zero.

Reserve and runway

The lowest cash balance includes starting cash and each week-end balance. The extra cushion is the amount needed to bring that lowest balance up to your chosen reserve. It is not a loan recommendation. Week-end calculations can miss a shortfall within a week, so review bill dates and collections with your accountant.

Actual results

Actual sales and cash expenses are recorded separately and compared with the action scenario. They do not silently replace forecast inputs. A difference is an observed variance; it does not establish that construction caused the change.

Construction information

Notices are manually entered source records. OpenDoor does not currently provide automatic roadwork monitoring or predict how a particular closure will affect your business. Confirm access and dates with the source authority.