GPS Guidance Overlap Calculator

Pass-to-pass accuracy is how manufacturers rate auto-steer systems — RTK correction is typically rated near 1 inch, WAAS-only closer to 6 inches — so entering it in inches lets you match the calculator to your actual equipment's spec sheet rather than guessing an equivalent overlap percentage.

Yes — with your implement width, GPS accuracy, and overlap percentage held fixed, the acres of overlap eliminated scale directly with the total acres covered, since the wasted overlap is calculated as a fixed fraction of every acre worked, so more acres worked means more acres of double-coverage eliminated.

Yes, holding the acres-saved figure fixed, input savings is simply that overlap acreage multiplied by your entered chemical, seed, or fertilizer cost per acre, so a pricier input produces a proportionally larger dollar savings for the same physical reduction in double-coverage.

The calculator assumes your manual overlap percentage holds steady across an entire season, but driver fatigue, low-light conditions, and repeated headland turns typically push real-world manual overlap above a driver's best midfield performance, so this model likely understates the actual savings from switching to guided steering.

Implement width sets the baseline you're comparing overlap against, so the same GPS accuracy in inches represents a smaller share of a wide implement's working width than a narrow one — a 60-foot boom loses proportionally less coverage to a 1-inch accuracy error than an 8-foot planter would.