Depends on where I go it’s between $150 to $2000 USD per month. I lower the costs by living or travelling to places with low cost of living, couchsurfing, cooking my own meals and spending less on transportation. I also don’t like to buy souvenirs or things in general because it adds to baggage weight, which costs extra to check-in. In where the cost of living is higher, I stay with Couchsurfing hosts or in Airbnb rooms or hostels that have a kitchen where I can make my own meals.
For transportation, money-saving tips are country-specific, but in general I buy low-cost flights and early bird train or bus tickets. To keep the cost low, I plan ahead and sacrifice flexibility. Instead of taking taxis, I save money by using public transportation, ridesharing or UberX, on-demand taxis which are usually cheaper than local taxi rates. Choosing less destinations and staying longer at each place also reduce the travelling time and tickets one has to buy.