3 free calculators
Everyday
Useful tools for travel, household energy and daily choices.
Tools in this category
Fuel Cost Calculator
Estimate fuel required and the total cost of a trip.
Electricity Cost Calculator
Estimate an appliance’s energy use and electricity cost.
Tip Calculator
Calculate a tip, bill total and amount per person.
Understand the calculations
Use these focused guides and worked articles to check formulas, assumptions and practical examples.