Costs
Estonia is by European standards relatively inexpensive, although prices for accommodation and dining are creeping towards western-European levels.
Currency
Estonia adopted the EURO (€) in 2011. If you are travelling from the UK or another non-Euro country, costs in Estonia will largely depend on how strong the Euro is against your home currency.
Typical costs
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At the budget end (staying in hostels, rarely eating out, walking and visiting mostly free sights), you might be able to get away with about €65/person/day.
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A more average budget for most visitors (staying at standard hotels or B&Bs, eating out once a day, going to the full range of sights and taking public transport), would be nearly double that, at around €120/person/day.
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Double that again and €240/person/day buys a pretty high-end experience, with smart hotels, meals at the full range of restaurants and taking taxis around town whenever you feel the need.
Note that traveling solo will probably raise any of these per-person-costs by at least a third for all except budget travellers.