Turn occupant loads into clear fixture schedules fast. Adjust ratios to match local design standards. Download tables for teams, bids, and approval packages today.
Enter occupancies and ratios. Use defaults as a starting point, then adjust to match your project’s requirements.
These examples show how ratios affect outputs. Adjust ratios to match your requirements.
| Scenario | Male | Female | WC ratio (M/F) | Lav ratio | Urinal method | Total WCs | Urinals | Lavatories |
|---|---|---|---|---|---|---|---|---|
| Small office suite | 18 | 22 | 50 / 35 | 50 | Substitution 50% | 2 | 0 | 1 |
| Training floor | 60 | 40 | 50 / 35 | 50 | Substitution 50% | 4 | 1 | 2 |
| Assembly area | 120 | 120 | 50 / 35 | 50 | Separate ratios | 6 | 3 | 5 |
| Mixed with unisex rooms | 40 | 60 | 50 / 35 | 50 | Substitution 50% | 4 (+1 unisex) | 1 | 2 (+1 unisex) |
Fixture planning starts with a defensible occupant load. This calculator lets you enter male and female counts, or use a total population with a percent split. For early design, teams often test multiple splits to see how the female water closet requirement controls the layout. Results are rounded up, so small changes near a ratio threshold can add an entire fixture.
Ratios translate people into fixtures using simple division and ceiling rounding. The default examples use 50 people per male closet, 35 per female closet, and 50 per lavatory, which helps illustrate sensitivity. For instance, increasing a female count from 69 to 70 at a 35:1 ratio moves from 2 to 2 fixtures, but 70 to 71 moves to 3. Use these breakpoints during schematic layout.
Male counts can be modeled using substitution or separate ratios. Substitution first computes a base male fixture count, then assigns a percentage as urinals while enforcing a minimum number of male closets. Separate ratios let you set one ratio for male closets and another for urinals. This flexibility supports different design standards without changing the underlying workflow.
Lavatories are calculated on total occupancy to support shared handwashing capacity. Optional showers can be enabled for facilities such as fitness areas, industrial programs, or staff support spaces. If your project includes single-user rooms, unisex fixtures can be added as additional counts. This helps teams quantify how family rooms or all-gender rooms affect total fixture schedules.
Accessibility fields track how many fixtures within the totals are planned as accessible subsets. The calculator clamps subsets so they cannot exceed totals, helping avoid reporting errors. After calculation, export the summary to CSV or PDF for coordination with architecture, plumbing, cost estimating, and permit documentation. Keep exports with revision dates to support design decisions. If totals change, rerun exports and archive prior versions for traceability during review cycles and stakeholder meetings and submittals later.
No. It is a planning tool that converts occupancy and ratios into counts. Always verify fixture minimums, distribution rules, and any exceptions against the governing code and local authority requirements.
Fixtures are discrete items, so fractional results are not buildable. The calculator uses ceiling rounding to ensure capacity meets or exceeds the selected ratio, which is typical for early planning and scheduling.
Use it when occupant load is known but gender distribution is uncertain. Testing multiple split percentages quickly shows which scenario governs water closet counts and whether unisex rooms may reduce layout risk.
Substitution starts with a base male fixture count and converts a percentage to urinals, while enforcing a minimum male closet count. Separate ratios calculate male closets and urinals independently using two different ratios.
No. They are tracked as subsets within the total counts. This helps reporting and coordination, while avoiding double counting. If your jurisdiction requires additional fixtures, adjust totals or ratios accordingly.
Include the project label, occupancy assumptions, selected ratios, and resulting fixture totals. Save exports with a date and revision note so estimating, plumbing design, and permitting teams can reference the same basis.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.