Travel & transport
Foreign card purchase total cost
Foreign card purchase total cost: Home-currency cost = foreign amount × rate × (1 + spread) × (1 + foreign transaction fee) + fixed fee.
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Travel & transport
Overseas ATM withdrawal cost
Overseas ATM withdrawal cost: Total home cost = converted cash with spread + ATM fee + bank fixed fee + bank percentage fee.
Travel & transport
Cash exchange effective rate
Cash exchange effective rate: Effective rate = (home currency paid + commission) ÷ foreign currency received.
Travel & transport
Travel daily budget with contingency
Travel daily budget with contingency: Total = (lodging × nights + daily costs × days + fixed costs) × (1 + contingency).
Travel & transport
Multi-currency trip budget
Multi-currency trip budget: Home total = base costs + each foreign amount × its manual rate, then apply entered fee allowance to foreign spending.
Travel & transport
Airline baggage fee comparison
Airline baggage fee comparison: Advantage of B = total trip cost for A minus total trip cost for B.
Travel & transport
Checked baggage weight distribution
Checked baggage weight distribution: Over-limit weight = max(0, total packed weight + empty bag weights − bags × per-bag limit).
Travel & transport
Visa and application trip fee budget
Visa and application trip fee budget: Total = per-person fees × applicants, plus document and travel costs, with the FX allowance applied to official per-person fees.
Travel & transport
Road trip fuel and toll cost
Road trip fuel and toll cost: Total = distance × fuel use/100 × fuel price + tolls + parking.
Travel & transport
Rideshare versus rental car
Rideshare versus rental car: Advantage of rental = rideshare total − rental total.
Travel & transport
Hotel stay total with taxes and fees
Hotel stay total with taxes and fees: Total = room subtotal × (1 + tax rate) + per-night resort and parking fees + fixed fees.
Travel & transport
Flight connection time buffer
Flight connection time buffer: Usable buffer = scheduled connection − expected delay − deplaning/walking − processing − gate-close margin.
Dates & time
Workday time-zone overlap
Workday time-zone overlap: Overlap hours = max(0, min(end A, end B) − max(start A, start B)).
Everyday arithmetic
Two-product unit price comparison
Two-product unit price comparison: Saving per unit with B = price A ÷ quantity A − price B ÷ quantity B.
Everyday arithmetic
Bulk buy break-even after waste
Bulk buy break-even after waste: Bulk saving per usable unit = small unit price − bulk price ÷ usable bulk quantity.
Everyday arithmetic
Toilet paper price per sheet
Toilet paper price per sheet: Price per 1,000 ply-sheets = price ÷ (rolls × sheets × ply) × 1,000.
Everyday arithmetic
Laundry detergent cost per load
Laundry detergent cost per load: Cost per load = price ÷ (container volume ÷ dose ÷ overpour factor).
Everyday arithmetic
Recipe cost per serving
Recipe cost per serving: Cost per serving = (ingredients × (1 + waste rate) + cooking energy) ÷ servings.
Everyday arithmetic
Home coffee versus café saving
Home coffee versus café saving: Break-even weeks = machine cost ÷ ((café price − home cost) × drinks per week).
Travel & transport
Commute cost per workday
Commute cost per workday: Driving cost per commute day = (distance × days × cost/km + parking) ÷ days.
Everyday arithmetic
Childcare work break-even income
Childcare work break-even income: Required gross monthly income = added monthly costs ÷ (1 − marginal deduction rate).
Everyday arithmetic
Pet annual cost planner
Pet annual cost planner: Annual planned cost = 12 × monthly costs + annual care, grooming and emergency reserve.
Everyday arithmetic
Event cost per guest
Event cost per guest: Cost per guest = total fixed and variable costs with contingency ÷ guest count.
Electronics & energy
Single-phase AC voltage drop
Single-phase AC voltage drop: Approximate resistive drop = 2 × current × length/1,000 × resistance × power factor.
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