Olutil stands for Online Utilities — a growing suite of privacy-first, browser-native web tools. This sub-site gives you a set of everyday car calculators that run entirely in your browser. Work out fuel consumption, plan a car loan, total the yearly cost of ownership and check when your next service is due — all in one place. 100% Local Processing
Turn odometer and fill-up records into L/100km and MPG, with an optional fuel cost.
Compare your measured fuel economy with the manufacturer rating and see the gap and extra cost.
Add up fuel, insurance, maintenance, tax and depreciation to get the yearly and per-kilometre cost.
Get a reference annual premium range from vehicle class, age, region and driving record.
See the on-road price, monthly payment and total cost, with taxes, fees and insurance packaged in.
Estimate a used car's resale range from brand, age, mileage and condition.
Get the next reference service mileage and estimated months from your odometer and monthly driving.
Check tread, age, mileage and damage to see if your tyres should be replaced.
Look up a reference cold tyre pressure in psi, bar and kPa for your vehicle type, load and season.
Get a reference oil change distance and time interval from your oil type and driving conditions.
Estimate a realistic electric-car range from battery capacity, consumption, temperature and driving style.
Work out the cost of a full charge and per 100 km, then compare it with petrol.
Estimate a battery's capacity and range retention from age, mileage and charging habits.
Get a reference toll range for a trip from distance, route type and vehicle class.
Practise eight original road-rule questions with instant scoring.
All tools on this site do their work locally in your browser. The numbers you type are never sent to any server, so your figures stay on your device. Pick a calculator, fill in the fields, press the calculate button and read or copy the result.
Yes. Every calculator on this site is free to use, with no account and no sign-up required.
No. All results are approximations for general information only. Fuel economy, costs and service intervals vary with the vehicle, driving conditions and your local market, so always check your owner's manual and the manufacturer's schedule.
Yes. All processing runs locally in your browser. The numbers you enter are not uploaded to any server, and you can use the tools while offline once the page is loaded.