Laundry Sink Capacity Calculator

Set sink volumes for messy garden washups. Account for freeboard, baskets, buckets, and soaking jobs. Get usable capacity and refill timing in seconds fast.

Calculator
Choose the basin footprint shape.
Used for size inputs and freeboard.
Account for not filling to the rim.
Inside basin length.
Inside basin width.
Use the basin depth you can safely fill.
Kept empty to reduce splashing and slosh.
Space taken by tools, produce, buckets, or laundry.
Subtract a known object volume for accuracy.
Used only for the extra displacement value.
Improves weight estimate using temperature density.
Used for the fill time estimate.
Choose the unit from your aerator spec.
Tip: Measure inside basin dimensions for best accuracy.
Reset
Example data table
Scenario Shape Dimensions Fill Freeboard Displacement Usable capacity
Tool rinse Rectangular 22 in × 18 in × 12 in 85% 0.5 in 10% ~116 L (30.6 gal)
Harvest soak Round 18 in diameter × 14 in 90% 0.75 in 5% ~104 L (27.5 gal)
Bucket wash Rectangular 24 in × 20 in × 14 in 70% 1.0 in 15% + 5 L ~124 L (32.7 gal)
Examples are illustrative. Your sink and routine vary.
Formula used
  • Rectangular basin volume: V = L × W × (D − F) × P
  • Round basin volume: V = π × (DIA/2)² × (D − F) × P
  • Conversion: Liters = m³ × 1000, Gallons = Liters ÷ 3.78541
  • Displacement: Usable = Gross × (1 − disp%) − dispVolume
  • Fill time: Minutes = UsableLiters ÷ Flow(L/min)
  • Weight: Mass = (Liters/1000) × density
L, W, D are inside dimensions. F is freeboard. P is fill fraction.
How to use this calculator
  1. Select the basin shape and measurement units.
  2. Measure inside dimensions and enter length/width or diameter.
  3. Enter depth and add freeboard for splash control.
  4. Set a target fill percent for your typical task.
  5. Add displacement percent for tools, produce, or buckets.
  6. Optionally subtract a known object volume for accuracy.
  7. Set flow rate to estimate fill time for refills.
  8. Press Calculate to see results above the form.

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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.