Car decisions, made clearer.

Reverse-estimate a loan’s nominal annual interest rate using principal, monthly payment and term.

Compare old and new loan payments on the same remaining balance and term, including refinance fees.

Calculate down payment, financing need and borrowing share for a purchase.

Estimate extra mileage charges when a lease exceeds its allowance.

Estimate vehicle purchase tax and fees on a quoted price.

Turn premium, optional coverage and deductible reserve into monthly and annual budgets.

Estimate how much cash remains after selling a car with fees and a loan payoff.

Compare keeping an existing car against a replacement over one time horizon.

Compare a fixed monthly vehicle subscription with a user-estimated ownership budget.

Work out total travel cost per kilometre and mile from annual distance and expenses.

Compare two vehicles’ fuel use at a shared annual driving distance.

Estimate how much fuel and money engine idling may use.

Estimate tailpipe carbon dioxide from entered fuel consumption and an emission factor.

Add fuel, tolls, lodging and parking, then split a trip budget among travellers.

Plan estimated driving time including stops at a given average moving speed.

Convert kWh per 100 km into Wh per mile and miles per kWh.

Calculate EV range from usable battery size, consumption and reserve percentage.

Estimate AC power from voltage, amperage, phases and power factor.

Explore how a hypothetical capacity-retention percentage changes usable range.

Budget a hypothetical future battery replacement using a chosen target year.

Estimate how far home solar production could drive an electric car.

Budget annual charging cost using the share of energy bought at home and public stations.

Estimate simple years to recover an EV price premium through annual operating savings.

Estimate distance and months until the next scheduled service.

Estimate total repair invoice from hours, labour rate, parts, fees and VAT.

Understand the difference between parts markup and gross margin.

Allocate a per-kilometre and annual budget for hypothetical brake maintenance.

Convert oil quantities between litres, US quarts and Imperial quarts.

Calculate concentrate and water amounts for a completely drained cooling system.

Estimate tyre age from a four-digit manufacturing week/year code.

Estimate inner clearance and outer wheel position when widths and offsets change.

Calculate approximate engine capacity from bore, stroke and cylinder count.

Compute a geometric compression ratio from swept and clearance volumes.

Convert total vehicle power and mass into horsepower per metric tonne.

Compare estimated passengers and cargo with a gross vehicle weight rating.

Compare loaded trailer mass against a manufacturer-stated tow rating.

Estimate speed from RPM, tyre diameter and gearing ratios.

Model reaction and braking distance under a user-assumed deceleration.

Model import duty and VAT on an assumed customs CIF value.

Calculate your budget ceiling after known shipping, auction fees and repairs.

Estimate shipment cubic metres and volume-based freight cost.

Budget fixed and variable annual costs for multiple vehicles.

Estimate resale margin after landed cost, repairs, selling expenses and fees.

Estimate lease-end vehicle value and value lost during a lease.

Compare a vehicle warranty premium against assumed repair probability and out-of-pocket cost.

Estimate total annual and monthly parking costs across workdays, weekends and fixed permits.

Plan annual toll spending from journeys, paid toll gates and occasional charges.

Model fuel and electricity spending for a plug-in hybrid with an assumed share of electric-only driving.

Estimate simple payback of home charger hardware and installation versus public charging.

Estimate grid electricity, charging losses and utility-billed price per useful battery kWh.

Compare approximate rim backspacing in millimetres using wheel width and offset.

Illustrate remaining tyre use from tread depth and an assumed wear rate.

Estimate fuel and time-based maintenance costs for idling equipment or fleet vehicles.

Apply an assumed cold-weather range reduction to a baseline electric range.

Compare annual commute rideshare spending with owning a vehicle.

Compare annual rental spending against the full annual cost of keeping a privately owned vehicle.

Convert a vehicle price using your manually supplied current exchange rate without external FX API calls.

Explore the extra fuel cost of an assumed percentage change in consumption; not a tyre-pressure prediction.

Estimate accessory runtime from user-provided 12V battery capacity, usable fraction and wattage.

Check an indicative load margin from your vehicle axle rating and the verified per-tyre load capacity.

Estimate mean acceleration and idealized distance over a time interval using constant-acceleration physics.

Set aside money per kilometre for scheduled servicing, wear and an optional annual contingency.

Compare two combustion powertrains using separate fuel prices and consumption with an upfront price premium.