Tools — United States
This directory groups tools tools within United States. Local money and property decisions combine arithmetic with rules that depend on where you live. Use this directory to find the existing country-specific tools, then read each page’s assumptions and limitations. A rate entered by the user is not a verified current tax rate, an approved loan offer or an insurance quote. Tools that use no country rules remain in the universal library rather than being copied into each country folder.
Start with these tools
Estimate Engine Output from Torque and RPM
Calculate engine power from measured torque and speed, with displacement-specific output and an explicit legacy airflow fallback.
Drag Performance
Estimate your vehicle's 1/4 mile elapsed time (ET) and terminal trap speed based on power-to-weight ratio.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency, and fuel price.
Gas Mileage Calculator
Convert a trip into MPG, liters per 100 km, and kilometers per liter.
Mileage Reimbursement
Calculate reimbursement from business miles and an editable per-mile rate, defaulted to the current 2026 U.S. business rate.
Start with the amount or measurement you need to estimate and gather the inputs from your own documents. Separate recurring payments from one-off fees, and distinguish an annual rate from a monthly amount. A material quantity does not by itself include labor, delivery, waste or permission to build. Check each of those assumptions independently. The published library does not yet contain the complete verified regional data required by the master build plan; no state or county pages are published as substitutes for that missing evidence. For decisions involving tax, lending, insurance or construction requirements, confirm the applicable rules with the responsible authority or qualified professional. The related universal tools are useful for checking the underlying arithmetic without implying local approval.
ownership costs
Estimate Engine Output from Torque and RPM
Calculate engine power from measured torque and speed, with displacement-specific output and an explicit legacy airflow fallback.
Drag Performance
Estimate your vehicle's 1/4 mile elapsed time (ET) and terminal trap speed based on power-to-weight ratio.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency, and fuel price.
Gas Mileage Calculator
Convert a trip into MPG, liters per 100 km, and kilometers per liter.
Mileage Reimbursement
Calculate reimbursement from business miles and an editable per-mile rate, defaulted to the current 2026 U.S. business rate.
Tire Size Calculator
Calculate exact tire dimensions from standard sidewall codes.
Frequently asked questions
How do I choose a tool from Tools — United States?
Start with the quantity you need to solve for, then compare the required inputs and assumptions before entering values.
Are results in Tools — United States guaranteed?
No. Read the formula, limitations and reference information on the individual calculator. Entered example rates are not current offers or professional advice.
Can I save a calculation from Tools — United States?
The calculator pages support browser-local project and share controls. Shared links and exported files may contain your inputs.