### How long does the hot water last when taking a shower?

I sometimes have arguments with the rest of my family because there is often not enough hot water for us all to have a shower in the morning. When we all need to have a shower I would like to know how long each of us can spend in the shower depending on the size of our water tank which is 75 litres. Can you calculate how long the water the water will last?

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### Control X-10 device with Insteon Hub

All this does is make urls so that you can control your insteon hub over the internet or ethernet using http get calls. This will enable you to write sophisticated programs in PHP to control your devices.

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### Currency Converter

Using the currency converter you can convert 83 different currencies. The results come from the European Central Bank so the results are always up to date.

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### Convert volumes such as pints and litres etc.

This caluclator will be very useful for volume conversions when using recipes, medicines, instructions where you need to convert between metric and imperial measurements.

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### Calculating the requirements for an off-grid solar power system.

Calculating the requirements for an off-grid solar power system It is very important to make good calculations when you design a solar system mainly because it is not possible to mix old batteries with new ones so you have to get it right first time. This calculator will help you calculate your requirements.

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### Calculate the date of Easter.

The calculation of the date of Easter is very complex, it depends on the full moon and other factors. If you just need to know the dates of Easter to make plans here they are.

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### Electrical cost calculator

See how much an electrical device costs to run and compare it to another device so you can see how much money you would save if you change it.

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### Birthday Celebration Calculator

Are you bored of having the same birthday every year? Do you want an excuse for a party? Use our thousand day aniversary calculator to find dates to celebrate.

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### Convert Roman numerals to Decimal numbers

You often see Roman numerals in books or at the end of films or television programs. This converter will help you convert decimal numbers into Roman numerals and viceversa.

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### How old is your dog in human years?

This calculator will allow you to calculate the age of your dog in human years. This is not an exact science and no one formula for dog-to-human age conversion is scientifically agreed on but it gives an approximate way of considering how old a dog is when compared to a human.

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### Add days to a date

Add a number of days to a date to find a date in the future.

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### Find the difference between two dates.

Calculate the number of days between two dates. This could be used to find out how long you have been married or how long it is since you started something.

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### Heating water

How long does it take to heat water up depends on the volume of water, the energy used, the starting temperature and the finishing temperature. Here you can calculate how long it takes to heat the water so you will know how long it will be before you can have a shower.

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### How much does smoking cigarettes cost?

The cost of smoking calculator will help you calculate how much money you are wasting on this horrible habit. You can see how much you will saved by giving up and see how much you have saved if you have given up.

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## EXPLANATION ABOUT OUR SITE

## What is the purpose?

The idea behind this site is to make calculators which are very easy to use for interesting or useful calculations. Some of the calculators are very useful, some are educational some are just for fun.

If you want to see a calculator on this site which does not exist already you can request it using the calculation request link above. We never charge anything for making a calculator, it is all free. Below are recently added calculators.