A solo-living budget: monthly bills, delivery meals and move-in costs
Build a solo-living budget with worked examples for weekly meal costs, moving-cost payback, deposits and irregular expenses, without unsupported city averages.
Guides for everyday choices
Compare costs, check contracts, and choose products that fit your needs.
Worked calculations and checklists help you decide what to do next. For guides about South Korean rules, check who they apply to and the reference date.
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All guides →Comparing lump-sum and installment deposit interest: payment timing and after-tax returns
Calculate 260,000 South Korean won in interest and 219,960 after tax for 12 start-of-month payments of 1 million at 4% annual simple interest. Also compare the different cash flows of a lump-sum deposit and the costs of preferential conditions.
Korean brokerage fees: sale and rental ceilings versus agreed charges
Calculate rental-value thresholds, a KRW 700 million sale fee and negotiated charges while distinguishing jurisdiction, monetary caps, VAT and payment evidence.
Euro travel exchange: compare EUR 500 and ATM fees
Compare total won costs for EUR 500, distinguish proportional and fixed fees, and understand DCC without assuming one travel payment mix is always cheapest.
External SSDs: USB 10 Gbps versus Thunderbolt 4
Separate link bandwidth from sustained file transfers, calculate 100 GB copy times and evaluate source, cable, thermal, capacity and backup constraints.
Choose a programming keyboard: layout, noise and connection tests
Use repeatable shortcut, typing, noise, wake and keymap tests, plus a weighted example and repair checklist, to compare keyboards for your own work.
A seven-day sleep diary: wake times, caffeine and daytime sleepiness
Calculate estimated sleep and a seven-day average, record caffeine and daytime sleepiness, and distinguish personal observations from signs requiring medical care.
Loan repayment calculations: equal payments, equal principal and interest-only
Compare a KRW 100 million, 4%, ten-year loan using formulas, first installments, total interest, final principal and the zero-rate boundary.