What a useful resource planning spreadsheet needs to answer
A resource planning spreadsheet should help a services team answer a small set of operational questions: who is available, what work needs to be staffed, where demand exceeds capacity, and which decision must be made next. It should do more than display names beside projects. It needs a consistent model for working hours, absence, allocations, skills, and future demand.
Excel can support that model while a team is small and the planning process has one clear owner. The workbook becomes unreliable when different managers keep separate copies, use different definitions, or update the same person in several places. The design below reduces those risks by giving every type of information one home and calculating the weekly plan from structured inputs.
Create six connected sheets instead of one large grid
Start with separate Excel tables for People, Projects, Allocations, Time Off, Capacity, and Dashboard. Each table should contain one type of record. Avoid merged cells, decorative blank rows, and manually coloured status cells in the source data because they make filtering, formulas, and future migration harder.
Give every person and project a stable identifier. Names and project titles can change, so formulas should connect records using an employee ID and project ID. Use Excel Tables so ranges expand automatically when new rows are added.
- People: employee ID, name, role, team, manager, skills, normal weekly hours, and start or end dates.
- Projects: project ID, client, project manager, start date, end date, status, and probability when the work is not confirmed.
- Allocations: employee ID, project ID, week starting date, planned hours, work type, and confirmation status.
- Time Off: employee ID, absence type, start date, end date, and hours unavailable.
- Capacity: one calculated row for each person and week.
- Dashboard: exceptions, trends, and decisions drawn from the underlying tables.
Use a person-week as the basic planning unit
The most dependable spreadsheet structure uses one row per person per week in the Capacity sheet. A weekly interval is detailed enough to expose overload and availability without creating the maintenance burden of a daily schedule. Use a consistent week-starting date, such as Monday, throughout the workbook.
For every person-week, calculate working capacity, time off, internal commitments, confirmed project hours, probable demand, available hours, and utilization. Keep confirmed assignments separate from pipeline demand so a likely opportunity does not look identical to signed work.
- Available capacity = normal working hours minus time off minus fixed internal commitments.
- Confirmed remaining capacity = available capacity minus confirmed project hours.
- Planned utilization = confirmed productive hours divided by available capacity.
- Scenario capacity = confirmed remaining capacity minus probability-weighted pipeline demand.
Build formulas that can be checked
Use SUMIFS to total allocation and absence hours by employee ID and week. Use XLOOKUP to bring role, team, manager, and normal hours from the People table. Wrap division formulas with an explicit check for zero available capacity rather than hiding every error with a broad IFERROR formula.
Make the assumptions visible. If a 40-hour employee has eight hours of leave and 28 confirmed project hours, the workbook should show 32 available hours, 87.5% planned utilization, and four remaining hours. A manager should be able to trace each result back to the underlying allocation and absence rows.
Prefer hours over percentages for stored allocations. A 50% allocation is ambiguous when people have different schedules or take leave. Percentages can still be calculated for reporting after the underlying hours are known.
Design the dashboard around exceptions
A useful dashboard does not repeat every workbook row. It directs attention to decisions. Show people above capacity, people with meaningful availability, projects with unfilled demand, probable work that creates a future role shortage, and material changes since the previous review.
Use conditional formatting sparingly. Red can identify a negative capacity balance, amber can identify a threshold approaching, and green can show usable availability. Always display the underlying number beside the colour so the workbook remains understandable when printed, exported, or viewed by someone with colour-vision differences.
- Overallocated people by week and by project.
- Available capacity grouped by role or skill.
- Unfilled confirmed demand and its required start date.
- Likely pipeline demand compared with future capacity.
- Planned productive and billable utilization trends.
Give the spreadsheet an operating process
Even a well-designed workbook will fail without ownership. Assign one person to maintain structure and validation rules. Define who can add demand, who confirms an allocation, and when approved leave must appear in the model. Protect formula columns while leaving input tables editable.
Run a weekly resource review focused on changes and exceptions. Resolve negative capacity, confirm upcoming project starts, update pipeline probabilities, and assign an owner and decision date to every staffing gap. Save a dated snapshot after the review so later changes can be explained without creating competing working copies.
Keep the workbook in one shared location and avoid emailing attachments. If managers need different views, build filters or pivot tables from the same source tables instead of duplicating the plan.
Know when Excel has reached its limit
Excel remains useful for analysis, import preparation, and temporary planning. It becomes a weak system of record when updates come from many teams, access must follow reporting or project relationships, staffing requests require approvals, or the organization needs a current connection between forecasts and actual time.
Warning signs include recurring version conflicts, broken formulas after copied rows, manual reconciliation between sales and delivery plans, leave discovered after assignments, and weekly meetings spent validating data before decisions can begin. At that point, adding another sheet usually increases maintenance instead of improving control.
- Several managers update the same people or projects.
- The plan needs role-based permissions or an audit history.
- Pipeline, time off, projects, and actual effort live in separate files.
- Staffing requests and approvals happen through email or chat.
- Leaders cannot see who changed an allocation or why.
Prepare the workbook for a clean move to resource planning software
A structured workbook makes migration easier. Remove duplicate people, standardize dates and working hours, give projects and employees stable IDs, and distinguish confirmed allocations from pipeline scenarios. Archive historical tabs that do not support current planning decisions.
KADO is designed for teams moving beyond Excel-based resource planning. It connects people, projects, weekly allocations, absence, resource requests, utilization, and future demand in one workspace. The spreadsheet can remain available for import and analysis while the live planning process moves to a shared system with clearer ownership and fewer competing versions.
- Choose one team and a practical planning horizon for the first migration.
- Import current people, active projects, future allocations, and approved leave.
- Validate totals between Excel and the new system before retiring duplicate plans.
- Run the same weekly review in the new workspace and measure whether planning effort and conflicts decline.