Online water consumption calculator. Calculate daily and monthly water consumption for your home, office or construction site.
An online water consumption calculator will help you calculate how much water is consumed in a house, apartment, office or construction site. Suitable for cost estimation, plumbing design, pump selection and resource conservation planning.
The water usage calculator uses standard water usage rates for different usage scenarios. The calculation is based on the number of residents/employees, type of premises and takes into account losses and leaks. Formula: Daily consumption = Number of people × Consumption rate (l/person/day) × (1 + Losses%). Monthly consumption = Daily consumption × 30 days. Annual consumption = Daily consumption × 365 days. The calculator automatically calculates the cost of water based on hot and cold water tariffs.
Let's look at practical examples of calculating water consumption for various use scenarios:
Calculation of water consumption for an apartment with 3 residents, norm 200 l/person/day
Входные данные:
Scenario: Apartment, Number of residents: 3, Norm: 200 l/person/day, Losses: 5%Расчёт:
Daily consumption per person: 200 l
Daily consumption for 3 people: 200 × 3 = 600 l
Taking into account losses (5%): 600 × 1.05 = 630 l
Hot water (40%): 630 × 0.4 = 252 l
Cold water (60%): 630 × 0.6 = 378 l
Monthly consumption: 630 × 30 = 18,900 l = 18.9 m³Результат:
Daily consumption: 630 l, Monthly consumption: 18.9 m³, Annual consumption: 229.95 m³
Сценарий:
Apartment
Standard norm for residential apartments in multi-storey buildings
Calculation of water consumption for a private house with 5 residents, norm 250 l/person/day
Входные данные:
Scenario: Residential building, Number of residents: 5, Norm: 250 l/person/day, Losses: 10%Расчёт:
Daily consumption per person: 250 l
Daily consumption for 5 people: 250 × 5 = 1,250 l
Taking into account losses (10%): 1,250 × 1.1 = 1,375 l
Hot water (40%): 1.375 × 0.4 = 550 l
Cold water (60%): 1.375 × 0.6 = 825 l
Monthly consumption: 1,375 × 30 = 41,250 l = 41.25 m³Результат:
Daily consumption: 1.375 l, Monthly consumption: 41.25 m³, Annual consumption: 501.875 m³
Сценарий:
Residential building
In private homes, consumption is higher due to watering, baths and other needs
Calculation of water consumption for an office with 20 employees, norm 80 l/person/day
Входные данные:
Scenario: Office, Number of employees: 20, Norm: 80 l/person/day, Losses: 3%Расчёт:
Daily consumption per person: 80 l
Daily consumption for 20 people: 80 × 20 = 1,600 l
Taking into account losses (3%): 1,600 × 1.03 = 1,648 l
Hot water (30%): 1,648 × 0.3 = 494.4 l
Cold water (70%): 1,648 × 0.7 = 1,153.6 l
Monthly consumption: 1,648 × 30 = 49,440 l = 49.44 m³Результат:
Daily consumption: 1,648 l, Monthly consumption: 49.44 m³, Annual consumption: 601.52 m³
Сценарий:
Office
In offices, water consumption is lower due to the lack of washing and cooking
Calculation of water consumption for a construction site, norm 700 l/day per site
Входные данные:
Scenario: Construction, Norm: 700 l/day per site, Losses: 15%Расчёт:
Daily consumption per facility: 700 l
Taking into account losses (15%): 700 × 1.15 = 805 l
Hot water (30%): 805 × 0.3 = 241.5 l
Cold water (70%): 805 × 0.7 = 563.5 l
Monthly consumption: 805 × 30 = 24,150 l = 24.15 m³
Cost at a tariff of 50 ₽/m³: 24.15 × 50 = 1,207.5 ₽Результат:
Daily consumption: 805 l, Monthly consumption: 24.15 m³, Cost: 1,207.5 ₽/month
Сценарий:
Construction
At a construction site, consumption includes concrete, watering, washing tools
Calculation of water consumption for a cafe, norm 150 l/person/day
Входные данные:
Scenario: Commercial premises, Number of visitors: 50 people/day, Norm: 150 l/person/day, Losses: 8%Расчёт:
Daily consumption per person: 150 l
Daily consumption for 50 people: 150 × 50 = 7,500 l
Taking into account losses (8%): 7,500 × 1.08 = 8,100 l
Hot water (50%): 8,100 × 0.5 = 4,050 l
Cold water (50%): 8,100 × 0.5 = 4,050 l
Monthly consumption: 8,100 × 30 = 243,000 l = 243 m³Результат:
Daily consumption: 8,100 l, Monthly consumption: 243 m³, Annual consumption: 2,956.5 m³
Сценарий:
Commercial premises
In cafes and restaurants, consumption is higher due to cooking and washing dishes
Calculation of savings when installing water-saving devices
Входные данные:
Initial consumption: 630 l/day (apartment for 3 people), Savings: 30%Расчёт:
Initial daily consumption: 630 l
Savings (30%): 630 × 0.3 = 189 l
New daily consumption: 630 - 189 = 441 l
Savings per month: 189 × 30 = 5,670 l = 5.67 m³
With a tariff of 50 ₽/m³ savings: 5.67 × 50 = 283.5 ₽/month
Savings per year: 283.5 × 12 = 3,402 ₽Результат:
Water savings: 189 l/day, Money savings: 283.5 ₽/month (3,402 ₽/year)
Сценарий:
Saving
Water-saving appliances can significantly reduce consumption and costs
The calculator uses standard water consumption rates for different scenarios:
Жилые помещения: 200-300 л/чел/день
Офисы: 50-100 л/чел/день
Строительство: 500-1000 л/день на объект
Стандартные нормы расхода воды для различных типов помещений:
200 л/чел/день
250 л/чел/день
80 л/чел/день
500-1000 л/день
150 л/чел/день
200-300 л/номер/день
500-2000 л/месяц
50-100 л/авто
Типичный расход воды бытовыми приборами и сантехникой:
Uses current water consumption standards
Supports various use cases
Accounting for hot and cold water, losses and leaks
Ability to save results as PDF or CSV
There are several ways to reduce water consumption:
Enter the number of residents and the appliances used - the calculator will show the total consumption.
Yes, the calculator takes into account construction scenarios (concrete, watering, washing tools).
In liters and cubic meters, with the possibility of conversion.
Yes, you can specify non-standard devices and consumption standards.
The calculated daily volume is multiplied by the number of days of the month.
Yes, the calculator adds the loss percentage of your choice.
Yes, there is a calculation mode for commercial premises.
Yes, you can set the proportion of hot and cold water.
Yes, the results are saved for comparison.
Yes, it helps determine the required flow rate for selecting pumps and pipes.
Yes, you can download the report in PDF or CSV.
The water consumption rate depends on the type of premises: apartment - 200 l/person/day, private house - 250 l/person/day, office - 80 l/person/day, construction - 500-1000 l/day per site. The calculator automatically uses standard rates depending on the selected scenario.
To calculate the water consumption of an apartment building, multiply the consumption rate per person (200 l/day) by the number of residents in all apartments. For example, a house with 100 apartments for 3 people: 200 × 3 × 100 = 60,000 l/day = 60 m³/day. The calculator helps calculate consumption for individual apartments and summarize the results.
To calculate water consumption on the meter, record the readings at the beginning and end of the period. The difference will show consumption. For example, the beginning of the month: 100 m³, the end of the month: 118 m³. Consumption: 118 - 100 = 18 m³ per month. The calculator helps you check whether the actual consumption meets the standards.
The calculator automatically calculates separately hot and cold water based on established tariffs. Typically, hot water makes up 30-40% of the total consumption, cold water - 60-70%. Enter your hot and cold water rates and the calculator will show the cost of each category and the total amount.
To convert liters to cubic meters, divide the number of liters by 1000. For example, 25,000 l = 25 m³. The calculator automatically shows consumption in both liters and cubic meters. Formula: Volume (m³) = Volume (l) / 1000.
To calculate the daily water consumption for a family, multiply the consumption rate per person (200-250 l/day) by the number of family members. For example, a family of 4 people: 200 × 4 = 800 l/day. Taking into account losses (5-10%): 800 × 1.05 = 840 l/day. The calculator automatically calculates daily, monthly and annual consumption.
To calculate the water consumption for a bath, consider: washing one person - 50-100 l, filling a pool - 500-2000 l, steaming - 200-500 l. For a family of 4, once a week: (100 + 1000 + 300) = 1,400 l × 4 times a month = 5,600 l/month. The calculator helps you include additional costs into your overall calculation.
To calculate water consumption for irrigation, use a rate of 5-10 liters per m², depending on the type of plant. For example, a garden of 100 m²: 100 × 7 l/m² = 700 l per watering. When watering 2 times a week: 700 × 2 × 4 = 5,600 l/month. The calculator allows you to add irrigation costs to your total consumption.
To calculate the water supply of an enterprise, take into account technological needs (production), household and drinking needs (employees), and fire-fighting water supply. The norms for office employees are 80-100 l/person/day. For production processes, use specific standards. The calculator helps calculate basic consumption for water supply planning.
To calculate water consumption for a pool, consider: initial filling (pool volume), evaporation replenishment (2-5% of volume per week), filter washing (300-500 liters once a week). For example, a 20 m³ pool: filling 20,000 l, refill 20,000 × 0.03 × 4 = 2,400 l/month, rinsing 500 × 4 = 2,000 l/month. Total: 24,400 l/month.
Water consumption for a washing machine depends on the energy efficiency class: class A+++ - 40-50 liters per cycle, class A - 50-60 liters. With 3 washes per week: 50 × 3 × 4 = 600 l/month. For a family of 4 people with 2 washes per week: 50 × 2 × 4 = 400 l/month. The calculator takes into account washing costs in total consumption.
Water consumption for a dishwasher: class A+++ - 6-8 liters per cycle, class A - 10-12 liters. With daily use: 8 × 30 = 240 l/month. For comparison: manual dishwashing requires 20-40 liters at a time. The dishwasher saves up to 75% water. The calculator helps estimate savings when using equipment.
Shower water consumption: 30-50 liters in 5 minutes (regular nozzle), 15-25 liters in 5 minutes (economical nozzle). Bath water consumption: 150-200 liters per bath. With a daily shower: 40 × 30 = 1,200 l/month. With a bath once a week: 175 × 4 = 700 l/month. The calculator takes into account the cost of hygiene needs in total consumption.
Water consumption for the toilet depends on the type of tank: old tank - 9-12 liters per flush, new dual-mode - 3-6 liters per flush (small mode), 6-9 liters per flush (full mode). With average use 5 times a day: old tank 10 × 5 × 30 = 1,500 l/month, new tank 5 × 5 × 30 = 750 l/month. Save up to 50%. The calculator takes into account toilet consumption in total consumption.
To calculate water consumption for a heating system, consider: initial filling of the system (system volume), make-up for losses (1-3% of volume per month). For example, heating system 200 l: filling 200 l, make-up 200 × 0.02 × 12 = 48 l/year. The calculator helps calculate water consumption for various life support systems.
To calculate water consumption for a car wash: car wash - 50-100 l, truck wash - 150-300 l, bus wash - 200-400 l. When washing 2 times a month: passenger car 75 × 2 = 150 l/month. Car wash with 100 cars per day: 75 × 100 × 30 = 225,000 l/month = 225 m³/month. The calculator helps calculate consumption for commercial properties.
To calculate the water consumption for the fire extinguishing system, use the following standards: internal fire water supply - 2.5 l/s per jet, external fire extinguishing - 5-40 l/s depending on the category of the building. The calculation is made in case of fire, and not for daily consumption. The calculator helps to calculate the main costs; for fire extinguishing, contact specialists.
To calculate water consumption for a well or well, determine the flow rate of the source (l/hour or m³/hour) and planned consumption. For example, well flow rate is 1.5 m³/hour = 36 m³/day. When a family of 4 people consumes × 250 l/day = 1 m³/day, the well will provide consumption with a reserve. The calculator helps determine the required flow rate of the water supply source.
To calculate water consumption for a pumping station, determine the maximum consumption per unit of time. For example, a house for 5 people: 5 × 250 l/day = 1,250 l/day = 1.25 m³/day. Maximum hourly flow: 1.25 / 24 × 2 (unevenness coefficient) = 0.1 m³/hour. Select a pump with a capacity of at least 0.1 m³/hour. The calculator helps determine the required pump performance.