Free Car & Driving Calculators

What Each Tool Does

Every tool below opens instantly, needs no account, and processes your data locally in your browser. Here is what each one is for:

Car Payment

The real monthly payment — price, tax, trade-in and rolled-over negative equity included — with the 20/4/10 affordability check. Open the Car Payment →

Gas Mileage

Real MPG from the only honest method (odometer + fill-up), your cost per mile, and instant trip/annual fuel budgets. Open the Gas Mileage →

Depreciation

Ten-year value curves by retention class, depreciation cost per year, and the 2–4 year sweet spot that makes used buyers rich(er). Open the Depreciation →

Lease vs Buy

Nine years, three strategies — serial leasing, finance-and-keep, used-and-keep — totaled honestly with equity counted at the end. Open the Lease vs Buy →

EV vs Gas

Your rates, your miles: per-mile fuel math, the maintenance gap, and the purchase premium payback — the subsidy-free verdict. Open the EV vs Gas →

Tire Pressure

Door-jamb PSI decoded, the 1-PSI-per-10°F rule computed for your climate, and the fuel/tire-wear bill for riding low. Open the Tire Pressure →

Reimbursement

Reimbursement math at the 2026 IRS rate for employees, employers and client invoicing — plus whether $0.70 actually covers your vehicle. Open the Reimbursement →

Extended Warranty

Warranty price against brand-adjusted expected repairs, the claim-denial reality, and the self-insurance fund that usually wins. Open the Extended Warranty →

Commute Cost

Fuel + wear + your valued hours = the real annual price of the drive — the number that reprices job offers and housing choices. Open the Commute Cost →

How to Choose the Right Tool

Buying: run Car Payment first, then Depreciation on the specific model class — a cheap payment on a fast-depreciating car is not cheap. Torn between leasing and financing, Lease vs Buy compares total cost over your actual keep-horizon, and EV vs Gas prices the fuel-and-maintenance gap for electric. Owning: Gas Mileage tracks real MPG, Commute Cost reveals what the drive to work costs per year, and Mileage Reimbursement calculates business-mile deductions at the current IRS rate.

Frequently Asked Questions

What interest rates do the loan tools assume?

You enter the rate — defaults reflect current average auto-loan APRs by credit tier, noted on the tool, but the number from your actual offer is the one that matters.

How accurate is the depreciation calculator?

It uses well-documented average depreciation curves (steepest in years 1–3, flattening after). Individual models vary — trucks and Toyotas hold value better than luxury sedans — so the tool lets you pick a retention profile.

Is the IRS mileage rate current?

The Mileage Reimbursement tool states the rate year it uses and lets you override the per-mile rate whenever the IRS updates it.

Do these tools store my vehicle or trip data?

No — everything computes locally in your browser and is forgotten when you close the tab.

Explore More WiserWork Categories

WiserWork offers 423 free browser-based tools across 26 categories — all private, all free, no sign-up required.