Calculator library

Guided sizing calculators.

Start with plain-English presets, then adjust the details if you know them. These tools are built to make practical buying decisions easier.

Home backup generator

Estimate the generator size you need for a house during a power outage using common household loads like refrigerators, pumps, heat, lights, and AC.

Estimate generator size for camping, RV use, tailgating, and portable outdoor power using common camper and campsite loads.

Estimate how long a portable power station can run common devices after real-world efficiency losses.

Estimate battery runtime from watt-hours, device load, and efficiency.

Estimate remaining trailer payload using trailer ratings, empty weight, cargo, and a safety margin.

Estimate a safe tongue weight range based on loaded trailer weight.

Estimate the air compressor CFM you need for common pneumatic tools and shop use.