Vehicle & Transportation CalculatorsFree car, fuel, EV, tire & trucking tools
28 free calculators for the questions drivers, owners and haulers actually ask: what a trip will cost in gas, whether bigger tires will throw off your speedometer, how much an EV saves you, what your car is worth now, and which freight class your pallet falls into.
What are vehicle & transportation calculators?
Vehicle and transportation calculators are free tools that turn driving numbers into decisions — fuel and trip cost, MPG, EV charging cost, tire and wheel fitment, towing limits, car depreciation, IRS mileage reimbursement and LTL freight class. Each DexoCalc tool shows its formula, the official data source it uses and a worked example, so you can check the math yourself.
What do you want to figure out?
Pick the question closest to yours and jump straight to the right tool.
Fuel, Mileage & Trip Cost Calculators
Gas cost, real-world MPG, carpool splits and the 2026 IRS mileage rate.
Gas Mileage Calculator (MPG)
Find your true miles per gallon from a fill-up or trip log, then see how it stacks up against your car’s EPA rating.
Fuel Cost Calculator
Estimate what any drive costs in gas from distance, MPG and your local price per gallon — one way or round trip.
Road Trip Cost Calculator
Budget the whole road trip — fuel, tolls, hotels and food — and see the cost per day and per traveler.
Gas Split Calculator
Split gas money fairly between riders on a carpool, road trip or airport run — no awkward math in the group chat.
Mileage Reimbursement Calculator
Turn logged business miles into a reimbursement or deduction at the 2026 IRS rate — 72.5¢ (Jan–Jun) and 76¢ per mile from July 1.
Fuel Consumption Calculator (L/100 km)
Work out L/100 km or km per litre and convert between US MPG, UK (imperial) MPG and metric in one place.
Commute Cost Calculator
See what your drive to work really costs per day, month and year — fuel, parking, tolls and wear included.
Electric Vehicle (EV) Calculators
Charging cost, charging time and honest EV-versus-gas savings.
EV Charging Cost Calculator
What a full charge, a week of driving or a cost per mile really costs at home or on public fast chargers, including charging losses.
EV Charging Time Calculator
How long it takes to charge from any % to any % on Level 1, Level 2 or DC fast charging, with the slow-down above 80% built in.
EV vs Gas Calculator
Compare yearly running costs and break-even point for an electric car versus a gas car on your own mileage and prices.
Car Buying, Ownership & Value Calculators
What you can afford, what you’ll pay in tax and what your car is worth over time.
Car Depreciation Calculator
Project your car’s value year by year and see how much it loses in year one, year five and by the time you sell.
Car Affordability Calculator
Find a realistic car price for your income using the 20/4/10 rule, with insurance and fuel counted — not just the payment.
Car Sales Tax Calculator
Estimate sales tax on a new or used car, with trade-in credit and common dealer fees, so the out-the-door price isn’t a surprise.
Cost of Car Ownership Calculator
Add up depreciation, fuel, insurance, maintenance, registration and financing to get the true cost per month and per mile.
Auto Loan Calculator
Financing the car? Our auto loan tool lives on the Finance hub with the other loan calculators — monthly payment, total interest and a full schedule.
Tire, Wheel & Gear Ratio Calculators
Fitment, speedometer error, wheel offset and final-drive math for upgrades.
Tire Size Calculator
Decode any size like 265/70R17 into diameter, width, sidewall and revs per mile, and compare two sizes side by side.
Speedometer Calibration Calculator
See your true speed after changing tire size — and how far off your odometer will drift every 10,000 miles.
Wheel Offset Calculator
Compare old and new wheels for offset and backspacing, and see exactly how much they’ll poke out or tuck in.
Gear Ratio Calculator
Work out cruising RPM, speed per gear and the right axle ratio after a tire-size change or regear.
Engine & Performance Calculators
Horsepower, acceleration, quarter-mile times and engine geometry.
Horsepower Calculator
Estimate horsepower from torque and RPM, or from vehicle weight and quarter-mile trap speed — and convert hp, kW and PS.
0-60 Calculator
Estimate 0–60 mph time from horsepower, weight and drivetrain, and see what shaving 100 lb or adding 50 hp would do.
Quarter Mile Calculator
Predict quarter-mile and eighth-mile ET and trap speed from power and weight using classic drag-racing formulas.
Engine Displacement Calculator
Calculate engine size from bore, stroke and cylinders, and convert between cc, liters and cubic inches.
Compression Ratio Calculator
Find static compression from bore, stroke, chamber, gasket and piston volumes before you order parts.
Towing, Trucking & Freight Calculators
Safe towing limits, owner-operator costs and 2025 NMFC freight classes.
Towing Capacity Calculator
Check a trailer against your truck’s GCWR, GVWR, payload and tongue weight — the limits that actually matter, not just the brochure number.
Trucking Cost Per Mile Calculator
Owner-operators: find your fixed and variable cost per mile and the minimum rate per mile you need to stay profitable.
Freight Class Calculator
Get pallet density in lb/ft³ and the matching LTL class on the 13-tier NMFC density scale that took effect July 19, 2025.
Travel Time & Road Safety Calculators
How long the drive takes and how much road you need to stop.
Travel Time Calculator
Estimate driving time and arrival from distance and average speed, with rest stops added for long hauls.
Stopping Distance Calculator
See total stopping distance — reaction plus braking — at any speed on dry, wet or icy roads. Useful for drivers and learners alike.
The core formulas and 2026 numbers behind these tools
Most vehicle math comes down to a handful of formulas. Here they are in plain sight, with the official figure each one depends on.
| What you’re working out | Formula | Key number / source |
|---|---|---|
| Miles per gallon | MPG = miles driven ÷ gallons used | Compare with your car’s EPA rating on FuelEconomy.gov |
| Trip fuel cost | (distance ÷ MPG) × price per gallon | Use your local pump price on the day you drive |
| Mileage reimbursement (US) | business miles × IRS rate | 72.5¢/mile Jan 1–Jun 30, 2026; 76¢/mile from Jul 1, 2026; charity 14¢ (IRS) |
| Metric fuel use | L/100 km = 235.21 ÷ US MPG | UK MPG uses imperial gallons: L/100 km = 282.48 ÷ UK MPG |
| EV charging cost | kWh added ÷ charging efficiency × $/kWh | Assume ~85–90% efficiency for home Level 2 (DOE AFDC guidance) |
| Tire diameter (inches) | (width × aspect% × 2 ÷ 25.4) + rim | Size format per tire sidewall marking, e.g. 265/70R17 |
| Freight density | weight (lb) ÷ (L × W × H in ÷ 1,728) | 13-tier NMFC density scale since July 19, 2025; ≥50 lb/ft³ = Class 50 |
Figures checked October 29, 2026. Rates and pump prices change — every calculator lets you override the default with your own number.
Four real questions, answered with the math shown
“What will a 300-mile drive cost?”
At 28 MPG the trip uses 300 ÷ 28 = 10.71 gallons. At $3.20 a gallon:
≈ $34.29 in fuel“How tall is a 265/70R17 tire?”
Sidewall = 265 × 0.70 = 185.5 mm, twice that is 371 mm, ÷ 25.4 = 14.61 in, plus the 17 in rim:
≈ 31.6 inches tall“What do 1,200 work miles pay back?”
Miles driven from July 1, 2026 onward use the updated IRS rate: 1,200 × $0.76.
= $912.00“What does it cost to add 60 kWh at home?”
60 kWh ÷ 0.90 efficiency = 66.7 kWh from the wall, × $0.16 per kWh:
≈ $10.67 per chargeHow every DexoCalc vehicle calculator is built and checked
A calculator is only useful if you can trust the answer. This is the process each tool on this page goes through before it’s published.
Start from the source
Formulas and defaults come from published standards and agencies — EPA, IRS, DOE, NHTSA, NMFTA and SAE — never from another calculator.
Show the math
Each page prints its formula, assumptions and a worked example in plain text, so you can verify the result by hand.
Test against known answers
Results are checked against official tables and real-world cases (EPA ratings, sidewall specs, IRS examples) before launch.
Re-check when rules change
When the IRS moves the mileage rate or NMFTA updates classes, the affected tools and this page are updated and re-dated.
Who builds these calculators
Manzoor Ahmad
Founder, Web Designer & Calculator Developer · 13+ years in web development and SEOI’m a professional pharmacist turned tech geek, and I’ve spent more than 13 years designing websites and building interactive tools. I’m not a mechanic, and I won’t pretend to be one. What I bring to these vehicle calculators is a pharmacist’s habit of getting the numbers exactly right: every formula here is taken from the agency or standard that defines it, tested against published examples, and shown on the page so you never have to take my word for it.
If you spot a number that looks off, or want a calculator that isn’t here yet, tell me through the author page — corrections get fixed and re-dated.
Vehicle & transportation calculator questions
Divide the trip distance by your car’s MPG to get gallons, then multiply by the price per gallon. A 300-mile trip at 28 MPG and $3.20 a gallon costs about $34.29. The Fuel Cost Calculator does this for one-way or round trips and lets you use your real-world MPG instead of the window-sticker figure.
The IRS set the 2026 business standard mileage rate at 72.5 cents per mile from January 1, then raised it to 76 cents per mile for miles driven from July 1, 2026, citing higher fuel costs. The charitable rate stays at 14 cents per mile because it is fixed by law. Our Mileage Reimbursement Calculator applies the correct rate to each half of the year.
Fill the tank, reset the trip meter, drive normally, then refill. Divide the miles driven by the gallons it took to refill. Averaging two or three tanks gives a far more reliable figure than a single fill-up or the dashboard display.
For most drivers who charge at home, yes — often by a wide margin per mile. The gap shrinks if you rely on public DC fast chargers, which can cost several times more per kWh than home electricity. The EV vs Gas Calculator compares both on your own mileage, electricity rate and gas price.
The speedometer error equals the percentage change in tire diameter. A tire that’s 3% taller makes the speedometer read 3% low — so showing 60 mph while you’re really doing about 61.8 mph. Many fitment guides suggest staying within about 3% of the original diameter; the Speedometer Calibration Calculator shows your exact figure.
For density-rated items, divide the shipment’s weight in pounds by its volume in cubic feet (inches L × W × H ÷ 1,728) and match the result to the NMFC density scale. Since July 19, 2025, that scale has 13 tiers, with 50 lb/ft³ or more landing in Class 50. Some commodities still carry their own NMFC rules, so always confirm with your carrier.
No. You also have to stay within the truck’s payload (people, cargo and tongue weight count against it), GVWR, rear axle rating and GCWR — the combined weight of truck and loaded trailer. Payload is often the limit people hit first. The Towing Capacity Calculator checks all of them together.
Yes, every tool is free with no sign-up. Each one uses formulas from official agencies and standards and shows its working, but results are estimates. Real fuel use, values and towing safety depend on your specific vehicle, so check your owner’s manual, your carrier or a qualified professional for decisions that matter.
Related calculator hubs
Sources we rely on
- U.S. Department of Energy & EPA — FuelEconomy.gov (fuel economy ratings and methods)
- Internal Revenue Service — Standard mileage rates (Notice 2026-10; Announcement 2026-11)
- U.S. DOE Alternative Fuels Data Center — afdc.energy.gov (EV charging levels and costs)
- National Highway Traffic Safety Administration — nhtsa.gov (tires, towing and vehicle safety)
- National Motor Freight Traffic Association — nmfta.org (NMFC classification, Docket 2025-1)
Disclaimer: DexoCalc calculators provide estimates for planning and education. They are not tax, legal, mechanical or freight-rating advice. Always confirm towing limits in your owner’s manual, tax treatment with a qualified tax professional, and freight class with your carrier.
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