Free tools for used-car dealers

Work out the out-the-door price of a used car in any state: price, dealer fee, tax, title and registration, less the trade-in.

Work out the sales tax on a used-car deal for all 50 states and DC, including trade-in credit, dealer fee and service contract treatment.

Work out the real profit, margin and markup on a used car after the purchase price, fees, repairs and other costs.

Find how many cars you must sell each month to cover your fixed costs.

See what floor plan financing costs on a car, from interest and flat fees, based on how long it sits.

Work out what it costs to hold a used car on your lot each day, including cost of money, insurance, lot and lost value.

Find your inventory turn rate and the average days a car sits before it sells.

Compare the profit from wholesaling a car today with the profit from retailing it, after recon, holding cost and selling cost.

Work out a salesperson's commission from a percentage of profit, a flat amount and a bonus.

Measure what your advertising earns: cost per lead, cost per car sold and return on spend.

Decide whether a repair or recon spend will pay for itself once you count the added days on the lot.

Find your all-in cost on an auction car and the most you can bid and still make your target profit.

Estimate the money needed to open a used-car dealership: inventory, license and bond, lot, insurance, software and reserve.

Grade your used-car lot A to F in about a minute from your turn rate, days to sell, profit per car and aging stock.

Decode a vehicle identification number for free: year, make, model, body, engine and more, from the federal NHTSA database.