Electricity usage calculator
For electricity use and cost from appliance power, operating time and tariff.
31 tools
Household calculators
Everyday calculations that come up around the house: how much electricity an appliance uses and what that costs at your tariff, how to split a bill with a tip across a group, and how long a pool takes to fill at a known flow rate. Every assumption is visible, and the rates and prices are yours to enter.
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ABV from gravity calculator
Alcohol strength from original and final gravity.
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Alcohol units calculator
How much pure alcohol and how many standard units a serving holds.
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Aquarium water change calculator
Volume of water to prepare for a change, corrected for substrate and decor.
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Baker's percentage calculator
Ingredient weights and dough hydration from baker's percentages of the flour.
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Coffee brew ratio calculator
How much coffee a volume of water takes at a chosen brew ratio.
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Calories per serving calculator
Calories of a whole dish and of one serving, from the ingredient list.
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Raw to cooked weight calculator
Convert dry grain weight to cooked and back, along with the calories per portion.
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Curtain fabric calculator
How much fabric curtains need at a given fullness.
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Dripping tap water loss calculator
How much water and money a dripping tap wastes per day, month and year.
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Electricity usage calculator
Kilowatt-hours an appliance uses and what that costs.
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Generator fuel calculator
How much fuel a generator burns over a shift, and what it costs.
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Heating power calculator
Heater or radiator power from room volume and a specific heat requirement.
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Room lighting calculator
How many lumens a room needs and how many lamps that comes to.
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Luggage linear inches calculator
The sum of a suitcase's three sides against the airline limit.
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Pet age calculator
Illustrative human-age estimate for a cat or dog using the 15/9/4/7 scale.
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Pet food calculator
Daily food ration from body weight, requirement multiplier and food energy.
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Picture frame mat calculator
Outer mat dimensions and border area from a visible image opening.
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Pool fill time calculator
How long a pool takes to fill at a known flow rate.
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Price per unit calculator
Price per kilogram, litre or piece, and a comparison of two packs.
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3D printing cost calculator
Material, electricity, wear and chosen markup in a printing-cost estimate.
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Rainwater harvesting calculator
How much water a roof collects from a given amount of rain.
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Recipe cost calculator
Cost of a dish from its ingredient list, and the price of a single serving.
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Recipe scaling calculator
Rescale every ingredient in a recipe to a different number of servings.
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Roasting time calculator
How long a joint needs in the oven from its weight and a per-kilo rate.
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Stock duration calculator
How many days a stock lasts at a known rate of use.
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Subscriptions cost calculator
Brings monthly and yearly subscriptions to one comparable monthly figure.
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Tip calculator
Tip, total and an even split across the table.
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Trip budget calculator
Accommodation, food, transport and activities — the full trip budget and the share per person.
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Utility bills calculator
Adds up metered utilities and fixed charges into one monthly total.
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Water heating time calculator
How long it takes to heat water at a given power.
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Yeast converter
Convert between fresh compressed, active dry and instant yeast by weight.
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Which calculation to choose
Heating power calculator
For an indicative room heating power under the selected form’s assumptions.
What to prepare
Use appliance power, actual on-time and your tariff; for heating, prepare room dimensions and applicable model conditions.
Common mistake
A kilowatt is power; a kilowatt-hour is energy. Required heating power is not continuous electrical consumption.
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FAQ
Where do I find my electricity tariff?
Your bill gives the price per kilowatt-hour. Electricity usage has a single tariff; with several rate bands, calculate each band’s consumption and price separately, then add the costs.
Is appliance power the number on the label?
Power × time assumes the entered power over the entered operating time. A cycling appliance is not continuously active at its rated power. Use suitable active time or measured average power; the calculator does not infer switching cycles.
How much should I tip?
It depends on country, venue and situation. The initial 10% is an editable calculation example, not a regional recommendation; you choose the percentage.
What do I need for the pool calculation?
Either the volume in cubic metres, or the dimensions of a rectangular or round pool, plus the flow rate. Arbitrary shapes are not supported.
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