Greywater Reuse Yield Planner Calculator

Estimate greywater reuse yield using household water and storage.

gal
%
gal
gal
%

Quick Facts

Reuse
Yield
Reuse reduces demand
Storage
Buffer
Storage smooths supply
Loss
Filter
Filtration reduces yield
Decision Metric
Coverage
Demand coverage

Your Results

Calculated
Weekly Reuse
-
Reuse per week
Net Reuse
-
After filtration loss
Coverage Percent
-
Share of demand
Storage Days
-
Days storage covers

Greywater Plan

Your defaults show meaningful reuse coverage.

What This Calculator Measures

Estimate greywater reuse yield using household water, reuse percent, and storage.

By combining practical inputs into a structured model, this calculator helps you move from vague estimation to clear planning actions you can execute consistently.

This calculator estimates greywater reuse yield and coverage.

How to Use This Well

  1. Enter daily household use and reuse percent.
  2. Add storage capacity and reuse days.
  3. Set garden demand and filtration loss.
  4. Review weekly reuse.
  5. Adjust reuse percent or storage.

Formula Breakdown

Daily reuse = household x reuse %
Weekly: daily reuse x days.
Net: weekly x (1 - loss).
Coverage: net / demand.

Worked Example

  • 220 gal daily with 35% reuse.
  • Weekly reuse around 385 gal.
  • Coverage about 59% of demand.

Interpretation Guide

RangeMeaningAction
80%+High.Great coverage.
50-80%Strong.Solid reuse.
30-50%Moderate.Consider storage.
Below 30%Low.Increase reuse.

Optimization Playbook

  • Increase reuse %: capture more greywater.
  • Boost storage: cover dry days.
  • Reduce loss: maintain filters.
  • Track demand: align with seasons.

Scenario Planning

  • Baseline: current reuse percent.
  • More storage: add 100 gallons.
  • Higher demand: increase by 100 gal.
  • Decision rule: keep coverage above 50%.

Common Mistakes to Avoid

  • Overestimating reuse percent.
  • Ignoring filtration losses.
  • Underestimating garden demand.
  • Skipping storage planning.

Implementation Checklist

  1. Measure water use.
  2. Estimate reuse share.
  3. Plan storage.
  4. Review coverage.

Measurement Notes

Treat this calculator as a directional planning instrument. Output quality improves when your inputs are anchored to recent real data instead of one-off assumptions.

Run multiple scenarios, document what changed, and keep the decision tied to trends, not a single result snapshot.

FAQ

What water can I reuse?

Showers and laundry are typical sources.

Is storage required?

Storage improves coverage but is optional.

How often to clean filters?

Follow system guidance to reduce losses.

Related Calculators