Faucet and shower flow: measure with volume and seconds
Measure flow from collected water and time; optionally estimate usage and cost.
Measure flow from collected water and time; optionally estimate usage and cost.
Prepare a container, run cold water at your usual opening, collect for a set time, then enter volume and seconds. Avoid slipping; hot water is unnecessary. Annual totals require usage time and daily uses; costs appear only with a rate.
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Method
Flow (L/min) = L ÷ s × 60; Flow (US gal/min) = (L/min) ÷ 3.785411784
Water per use (L) = (L/min) × min; Daily average water (L) = Water per use (L) × Uses per day (optional)
1 US gal = 3.785411784 L; 1 mL = 0.001 L
Annual water (L) = Daily average water (L) × 365; Monthly average water (L) = Annual water (L) ÷ 12
Annual cost = Annual water (L) ÷ 1000 × (Water rate + Sewer rate (optional)); Monthly average cost = Annual cost ÷ 12
Notes
Prepare a container, run cold water at your usual opening, collect for a set time, then enter volume and seconds. Avoid slipping; hot water is unnecessary. Annual totals require usage time and daily uses; costs appear only with a rate.