Singapore is the most expensive country in South-East Asia, but food prices in Singapore and the prices of hotels in Singapore are still considerably lower than in Europe.
Travellers wishing to stay in a relatively comfortable hotel in Singapore and eat in simple but good restaurants need at least 70 € per person per day. Sleeping in cheap hotels and eating at food stalls can cut this budget down to around 35 € per day. If your travel budget is extremely tight there is probably not much sense travelling to Singapore as you will be able to enjoy Singapore only if you are able to afford at least a part of what it is offering to visitors.
The upper limit of Singapore travel budget is practically unlimited. If you choose to sleep in the best five-star hotels, eat in exclusive restaurants and indulge into some serious shopping spree you can easily spend a fortune in Singapore.
Otherwise, two of the most expensive things to do in Singapore are drinking and smoking. Alcohol and tobacco are heavily taxed in Singapore, thus a beer or a pack of cigarettes will cost you well over 5 €. If you think you can save your money on cigarettes by bringing them from home, think again. You are not allowed to bring a single cigarette into Singapore. Controls are thorough and frequent, the fines sky-high.