Auto & Travel

Decode a 17-character Vehicle Identification Number: validate the check digit, find the manufacturer and country from the WMI, and the model year.

Calculate your car's real fuel economy from a fill-up — miles per gallon, L/100 km and km/L — and the fuel cost per mile or km.

Calculate the cost to charge an electric car at home or a public charger, the cost per mile, and yearly savings compared with a gas car.

Estimate real-world range for an electric car or e-bike from battery size and consumption, adjusted for temperature, speed and heating or AC.

Estimate how much value a new or used car loses each year, and what it will be worth after a number of years.

Find how much car you can afford with the 20/4/10 rule, and the total monthly cost of owning it — payment, insurance, fuel and maintenance.

Compare two tire sizes (e.g. 225/45R17 vs 235/40R18): diameter, width and sidewall differences, revolutions per mile and the speedometer error after changing tires.

Convert torque and RPM to horsepower, calculate engine displacement from bore and stroke, and estimate 0–60 mph and quarter-mile times from power and weight.

Check whether your vehicle can safely tow a trailer — trailer weight vs rating, tongue weight, payload and the combined weight limit.

Work out what your commute costs per year by car — fuel, wear and parking — and compare it with rideshare, or estimate a rideshare driver's net earnings per hour.

Calculate total stopping distance at any speed — reaction distance plus braking distance — for dry, wet or icy roads.

Find your bike frame size for road, mountain, gravel or hybrid bikes from your inseam — in centimetres and inches, with the typical S/M/L size.

Which power plug and voltage each country uses — so you know whether you need a travel adapter, a voltage converter, or neither.

How much to tip in restaurants, taxis and hotels around the world — from the US (18–22%) to Japan (don't tip) — with local customs.

Check whether your carry-on or personal item fits the size and weight limits of major airlines — American, United, Delta, BA, Lufthansa, Ryanair, easyJet and more.

Work out how much fuel a road trip needs and what it costs — in miles or km, with MPG (US or UK), L/100km or km/L — split between passengers.

Calculate the great-circle flight distance between two cities or coordinates, the approximate flight time and the CO₂ per passenger by travel class.

Check whether a delayed or cancelled flight qualifies for EU261 or UK261 compensation and how much — €250 to €600 (or £220 to £520) per passenger.

Plan a trip budget: flights, accommodation, food, activities, local transport and parking — total, per day and per person.

Get the most time off from the fewest vacation days: find the public holidays you can bridge to a long weekend or a full week off, for the US or UK.

Generate a packing checklist for your trip — clothes quantities for the length of stay, plus essentials for beach, city, business, hiking or ski trips.

Solve speed, distance or travel time from the other two — in mph, km/h or knots — including nautical miles and boat fuel use.