Everyday living
How long will my household supplies last?
Estimate how long toilet paper, detergent, shampoo, drinking water, rice, or gas will last using the amount remaining and your household's actual use.
Start calculatingOne calculator · six household supplies
Which supply do you want to check?
Changing the supply switches its units and example together.
Selected supply · Drinking water
How many days will my drinking water last?
Divide stored water by a per-person daily amount you choose. This calculator does not provide medical hydration advice.
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Formula and assumptions
Choose a supply and enter the amount remaining and your household's actual use. Compare the estimated duration with the range for higher or lower use to plan your next purchase.
Why the result can vary
Product specifications, measurement error, household habits, travel, meals out, weather, and burner settings can change the real run-out time. The range is an input sensitivity, not a statistical guarantee.
Example
One method from toilet paper to rice
Inputs: For 12 toilet-paper rolls, enter sheets per roll and daily use; for 10kg of rice, enter people and dry grams per day
Outcome: See the selected supply's duration, consumption rate, and estimated depletion date in the same workspace.
Cautions
- Water results are not medical hydration advice, and rice inputs use uncooked dry mass.
- Gas calculations estimate fuel quantity only; follow product and local guidance for compatibility, ventilation, leaks, and storage.
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Frequently asked questions
Are toilet paper, detergent, shampoo, water, rice, and gas all calculated on one page?
Yes. Changing the option switches the shared stock-duration engine to the appropriate fields, units, and explanation. Values from different supplies are never mixed in one calculation.
How do I estimate how many days my toilet paper will last?
Multiply rolls remaining by sheets per roll, then divide by the household's daily sheet use. Count a partly used roll as a decimal, such as 0.5. Check the package because rolls contain different sheet counts.
How many washes or days will detergent and shampoo last?
Divide the remaining amount by the amount used per wash, using milliliters for liquids or grams for powder detergent. Then use household size and weekly washing frequency to estimate days. Measure your product's dose or pump volume for a better estimate.
How should household size affect water and rice?
For water, use the household's total liters per day. For rice, use uncooked dry grams per person per day times household size. The water option does not prescribe medical hydration needs.
Does a gas cylinder show hours instead of days?
Yes. Remaining fuel mass is divided by fuel used per hour. Flame setting, temperature, and appliance efficiency can change actual runtime.
Is the calculated day or hour an exact run-out time?
No. It is a planning estimate assuming the entered average continues. Use realistic stock and variation inputs to reflect changing use.