Automotive Calculators
Free automotive calculators for EV charging cost, tire size comparisons, and practical vehicle planning.
EV Charging Cost Calculator
Estimate the grid energy and electricity cost required to add a chosen amount of energy to an EV battery.
Tire Size Calculator
Compare two metric tire sizes for diameter, circumference, percentage difference, and speedometer effect.
Use vehicle calculators as comparison tools
Automotive decisions often combine several measurements that use different units. CalcCaddy keeps those inputs visible so a result can be checked against the vehicle manual, tire data, charger display, or utility rate. The calculators do not select equipment or approve a modification.
For tire comparisons, review overall diameter, circumference, and percentage difference together. For EV charging, distinguish energy added to the battery from energy drawn from the grid. Small assumptions can change a result, so replace defaults with values for the actual vehicle and service.
What to verify before acting
- Tires: approved rim width, load index, speed rating, clearance, inflation requirements, and vehicle-manufacturer guidance.
- EV charging: usable battery capacity, charger efficiency, utility rate period, session fees, and equipment rating.
- Safety: manufacturer specifications and qualified service take priority over a planning estimate.
Detailed automotive guides
Use the tire-size comparison guide to understand sidewall and speedometer effects, or the EV charging-cost guide for grid-energy and efficiency examples.
Why the inputs matter
A tire-size result is only as useful as the complete size and vehicle context. Nominal tire dimensions describe geometry, while actual dimensions, approved wheel widths, load capacity, and clearance come from the tire and vehicle documentation. An EV charging result similarly depends on whether the entered energy represents battery gain or wall consumption and whether the rate reflects the actual charging period.
CalcCaddy therefore leaves the decisive values editable and shows the intermediate math. The result is intended to organize a comparison, reveal assumptions, and highlight questions to verify—not to recommend a specific tire, charger, or modification.