Water Usage & Conservation Calculator
ANA›Life Services Authority›National Calculator Authority›Water Usage & Conservation Calculator
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Water Usage & Conservation Calculator
Estimate your daily and monthly household water usage and see how much water (and money) you can save with simple conservation measures.
### Household Information
Number of people in household
Water rate ($/gallon)
Average US rate ≈ $0.004/gallon ($4.00 per 1,000 gallons)
### Daily Water Activities (per person)
Showers per day
Average shower duration (minutes)
Shower head type
Standard (2.5 gal/min) Low-flow (2.0 gal/min) Ultra low-flow (1.5 gal/min)
Toilet flushes per day
Toilet type
Older toilet (3.5 gal/flush) Standard (1.6 gal/flush) High-efficiency (1.28 gal/flush) Dual-flush avg (1.0 gal/flush)
Faucet use per day (minutes) — brushing teeth, washing hands, etc.
Faucet type
Standard (2.2 gal/min) Low-flow (1.5 gal/min) Aerator (0.5 gal/min)
### Household Activities (total per day)
Dishwasher loads per day
Dishwasher type
Older model (6 gal/load) Standard (4 gal/load) Energy Star (3 gal/load)
Laundry loads per week
Washing machine type
Older top-loader (40 gal/load) Standard top-loader (25 gal/load) Front-loader / HE (15 gal/load)
Outdoor watering per week (minutes)
Sprinkler/hose flow rate (gal/min)
### Conservation Measures (optional)
Check the measures you are willing to adopt to see potential savings.
Fix leaky faucets/toilets (saves ~10 gal/person/day) Shorten showers by 2 minutes per shower Turn off tap while brushing teeth (saves ~4 gal/person/day) Run only full dishwasher/laundry loads (saves 20% per load) Rainwater harvesting for outdoor use (saves 50% outdoor)
Calculate Water Usage
function watCalc() { // --- Inputs --- var people = parseFloat(document.getElementById('wat-people').value); var rate = parseFloat(document.getElementById('wat-rate').value); var showers = parseFloat(document.getElementById('wat-showers').value); var showerMin = parseFloat(document.getElementById('wat-shower-min').value); var showerFlow = parseFloat(document.getElementById('wat-shower-type').value); var flushes = parseFloat(document.getElementById('wat-toilet-flushes').value); var flushGal = parseFloat(document.getElementById('wat-toilet-type').value); var faucetMin = parseFloat(document.getElementById('wat-faucet-min').value); var faucetFlow = parseFloat(document.getElementById('wat-faucet-type').value); var dishLoads = parseFloat(document.getElementById('wat-dishwasher').value); var dishGal = parseFloat(document.getElementById('wat-dishwasher-type').value); var laundryWeek = parseFloat(document.getElementById('wat-laundry').value); var laundryGal = parseFloat(document.getElementById('wat-laundry-type').value); var outdoorMin = parseFloat(document.getElementById('wat-outdoor').value); var sprinklerFlow = parseFloat(document.getElementById('wat-sprinkler').value);
var fixLeaks = document.getElementById('wat-fix-leaks').checked; var shortShower = document.getElementById('wat-short-shower').checked; var turnOffTap = document.getElementById('wat-turn-off-tap').checked; var fullLoads = document.getElementById('wat-full-loads').checked; var rainHarvest = document.getElementById('wat-rain-harvest').checked;
// --- Validation --- var errors = []; if (isNaN(people) || people 0) { document.getElementById('wat-result').innerHTML = 'Please fix the following errors:' + errors.join('') + '
'; return; }
// --- Base Daily Usage (gallons/day) --- // Per-person components (scaled by people) var showerGal = showers * showerMin * showerFlow * people; var toiletGal = flushes * flushGal * people; var faucetGal = faucetMin * faucetFlow * people;
// Household components (not per-person) var dishGalDay = dishLoads * dishGal; var laundryGalDay = (laundryWeek / 7) * laundryGal; var outdoorGalDay = (outdoorMin / 7) * sprinklerFlow;
var totalBaseDaily = showerGal + toiletGal + faucetGal + dishGalDay + laundryGalDay + outdoorGalDay;
// --- Conservation Savings (gallons/day) --- var savingsLeaks = fixLeaks ? 10 * people : 0; var savingsShower = shortShower ? showers * 2 * showerFlow * people : 0; var savingsTap = turnOffTap ? 4 * people : 0; var savingsLoads = fullLoads ? (dishGalDay + laundryGalDay) * 0.20 : 0; var savingsRain = rainHarvest ? outdoorGalDay * 0.50 : 0;
var totalSavingsDaily = savingsLeaks + savingsShower + savingsTap + savingsLoads + savingsRain; var conservedDaily = Math.max(0, totalBaseDaily - totalSavingsDaily);
// --- Monthly & Annual --- var daysMonth = 30.44; var daysYear = 365;
var baseMonthly = totalBaseDaily * daysMonth; var baseAnnual = totalBaseDaily * daysYear; var conserveMonthly = conservedDaily * daysMonth; var conserveAnnual = conservedDaily * daysYear;
var savingsMonthly = (totalBaseDaily - conservedDaily) * daysMonth; var savingsAnnual = (totalBaseDaily - conservedDaily) * daysYear;
// --- Cost --- var costBaseMonthly = baseMonthly * rate; var costBaseAnnual = baseAnnual * rate; var costConserveMonthly = conserveMonthly * rate; var costConserveAnnual = conserveAnnual * rate; var costSavingsMonthly = savingsMonthly * rate; var costSavingsAnnual = savingsAnnual * rate;
// --- Per-person daily --- var perPersonDaily = totalBaseDaily / people;
// --- Breakdown percentages --- var pctShower = totalBaseDaily > 0 ? (showerGal / totalBaseDaily * 100).toFixed(1) : 0; var pctToilet = totalBaseDaily > 0 ? (toiletGal / totalBaseDaily * 100).toFixed(1) : 0; var pctFaucet = totalBaseDaily > 0 ? (faucetGal / totalBaseDaily * 100).toFixed(1) : 0; var pctDish = totalBaseDaily > 0 ? (dishGalDay / totalBaseDaily * 100).toFixed(1) : 0; var pctLaundry = totalBaseDaily > 0 ? (laundryGalDay / totalBaseDaily * 100).toFixed(1) : 0; var pctOutdoor = totalBaseDaily > 0 ? (outdoorGalDay / totalBaseDaily * 100).toFixed(1) : 0;
var savingsPct = totalBaseDaily > 0 ? ((totalBaseDaily - conservedDaily) / totalBaseDaily * 100).toFixed(1) : 0;
- // --- US Average comparison ---
- // US average ~80-100 gallons/person/day indoors
- var usAvgPerPerson = 90;
- var vsAvg = (perPersonDaily - usAvgPerPerson).toFixed(1);
- var vsAvgLabel = vsAvg > 0
- ? '+' + vsAvg + ' gal above US avg'
- '' + vsAvg + ' gal below US avg';
// --- Output --- var html = '### 💧 Water Usage Results ';
html += ''; html += 'MetricCurrent Usage'; if (totalSavingsDaily > 0) html += 'With ConservationSavings'; html += '';
- function row(label, base, conserve, savings, unit, isCost) {
- var fmt = isCost
- ? function(v){ return '$' + v.toFixed(2); }
- function(v){ return v.toFixed(1) + ' ' + unit; }; var r = ''; r += '' + label + ''; r += '' + fmt(base) + ''; if (totalSavingsDaily > 0) { r += '' + fmt(conserve) + ''; r += '' + fmt(savings) + ''; } r += ''; return r; }
html += row('Daily Usage', totalBaseDaily, conservedDaily, totalBaseDaily - conservedDaily, 'gal', false); html += row('Monthly Usage', baseMonthly, conserveMonthly, savingsMonthly, 'gal', false); html += row('Annual Usage', baseAnnual, conserveAnnual, savingsAnnual, 'gal', false); html += row('Monthly Cost', costBaseMonthly, costConserveMonthly, costSavingsMonthly, '', true); html += row('Annual Cost', costBaseAnnual, costConserveAnnual, costSavingsAnnual, '', true); html += '';
html += ''; html += 'Per-person daily usage: ' + perPersonDaily.toFixed(1) + ' gal/day | ' + vsAvgLabel; html += '';
// Breakdown html += '#### 📈 Usage Breakdown (Current) '; html += ''; html += 'CategoryGal/DayShare';
function brow(label, gal, pct) { return '' + label + '' + '' + gal.toFixed(1) + '' + '' + pct + '%'; } html += brow('🚿 Showers', showerGal, pctShower); html += brow('🚽 Toilet', toiletGal, pctToilet); html += brow('🪟 Faucet', faucetGal, pctFaucet); html += brow('🆎 Dishwasher', dishGalDay, pctDish); html += brow('👕 Laundry', laundryGalDay,pctLaundry); html += brow('🌿 Outdoor', outdoorGalDay,pctOutdoor); html += 'Total' + totalBaseDaily.toFixed(1) + '100%'; html += '';
// Conservation summary if (totalSavingsDaily > 0) { html += ''; html += '✅ Conservation Impact: By adopting the selected measures, you could reduce water usage by '; html += '' + savingsPct + '% (' + (totalBaseDaily - conservedDaily).toFixed(1) + ' gal/day), '; html += 'saving approximately $' + costSavingsAnnual.toFixed(2) + '/year.'; html += ''; } else { html += ''; html += '💡 Select conservation measures above to see potential savings.'; html += ''; }
document.getElementById('wat-result').innerHTML = html; }
#### Formulas Used
Shower usage (gal/day): Shower_gal = Showers/day × Duration(min) × Flow_rate(gal/min) × People
Toilet usage (gal/day): Toilet_gal = Flushes/day × Gallons/flush × People
Faucet usage (gal/day): Faucet_gal = Minutes/day × Flow_rate(gal/min) × People
Dishwasher usage (gal/day): Dish_gal = Loads/day × Gallons/load
Laundry usage (gal/day): Laundry_gal = (Loads/week ÷ 7) × Gallons/load
Outdoor usage (gal/day): Outdoor_gal = (Minutes/week ÷ 7) × Flow_rate(gal/min)
Total daily usage: Total = Shower + Toilet + Faucet + Dishwasher + Laundry + Outdoor
Monthly usage: Total_daily × 30.44 Annual usage: Total_daily × 365 Cost: Usage(gal) × Rate($/gal)
#### Assumptions & References
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