Travel & transport
Layover usable time
Layover usable time: Usable layover minutes = scheduled layover less deplaning, walking, boarding buffer and extra processing.
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Travel & transport
Travel insurance expected-cost comparison
Travel insurance expected-cost comparison: Expected covered benefit less premium = claim chance times covered loss after deductible, minus premium.
Travel & transport
Mobile roaming versus eSIM cost
Mobile roaming versus eSIM cost: Savings with eSIM = daily roaming total minus eSIM package and top-ups.
Travel & transport
Group trip cost split with personal extras
Group trip cost split with personal extras: Your settlement = equal share of shared costs plus personal extras minus amount already paid.
Electronics & energy
Solar panel count from energy usage
Solar panel count from energy usage: Panel count = daily energy divided by peak sun hours, panel kW and one minus system loss, rounded up.
Electronics & energy
Solar battery usable runtime
Solar battery usable runtime: Runtime hours = nominal capacity times usable depth and efficiency, divided by average load.
Electronics & energy
Generator versus grid energy cost
Generator versus grid energy cost: Generator premium per kWh = fuel cost per hour divided by average kW output, minus grid price.
Travel & transport
EV home charging cost with losses
EV home charging cost with losses: Wall energy = battery energy divided by one minus loss rate; charging cost = wall energy times electricity price.
Travel & transport
EV versus hybrid trip energy cost
EV versus hybrid trip energy cost: Savings with EV = hybrid fuel cost minus EV charging energy cost for the same distance.
Travel & transport
Vehicle depreciation per mile
Vehicle depreciation per mile: Depreciation per distance unit = purchase price minus resale value, divided by distance driven.
Travel & transport
Tyre or tire cost per distance
Tyre or tire cost per distance: Tyre cost per distance unit = installed set and lifetime service cost divided by expected life distance.
Travel & transport
Vehicle true monthly cost
Vehicle true monthly cost: Monthly vehicle cost = monthly costs plus annual fees divided by twelve.
Travel & transport
Monthly commuting and parking cost
Monthly commuting and parking cost: Monthly commute cost = days times round-trip vehicle and parking costs plus transit fares.
Travel & transport
Cheaper fuel detour break-even
Cheaper fuel detour break-even: Net detour saving = fuel purchase saving minus the entered cost of extra fuel used and the value of extra time.
Education
Tuition payment plan total cost
Tuition payment plan total cost: Total plan cost = tuition balance plus setup fee and monthly fees.
Education
Student loan interest per day
Student loan interest per day: Daily simple interest = principal balance times annual rate divided by 365.
Education
Course cost per learning hour
Course cost per learning hour: Cost per learning hour = tuition and materials divided by class plus study hours.
Education
Textbook rent versus buy
Textbook rent versus buy: Savings from renting = net buy cost minus rental and return-shipping cost.
Everyday arithmetic
Childcare effective hourly cost
Childcare effective hourly cost: Effective hourly cost = weekly fee plus extras less support, divided by care hours.
Everyday arithmetic
Nanny share family cost split
Nanny share family cost split: Your weekly cost = shared wages and employer costs times your percentage, plus family-specific extras.
Everyday arithmetic
School supplies budget per child
School supplies budget per child: Average budget per child = shared and individual supplies with buffer divided by number of children.
Education
Meal plan cost per used meal
Meal plan cost per used meal: Effective cost per used meal = meal plan price less usable credits, divided by expected meals used.
Education
Weighted exam score needed
Weighted exam score needed: Required exam score = target minus current weighted points, divided by remaining course weight.
Education
Study hours per week planner
Study hours per week planner: Average weekly study hours = courses times normal weekly hours plus catch-up hours spread across teaching weeks.
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