Tractor GPS Guidance & Free Farming Tools
Measure field area, calculate acres per hour, plan spray rates — all free, no signup. Need GPS guidance in the field? Try FieldMate on your iPhone.
Field Area Calculator
Draw on a map, get acres or hectares instantly
Most popularAcres Per Hour Calculator
Width + speed + efficiency = field capacity
Quick calcSpray Rate Calculator
Tank loads, total volume, and cost per acre
For sprayersSeed Rate Calculator
Pounds per acre for any crop and field size
Crop presetsFarming Unit Converter
Acres/hectares, lbs/kg, gallons/liters, bushels/tonnes
Instant convertTractor GPS Guidance Guides
Learn how GPS guidance works, compare apps, and understand the real costs.
Complete Guide to GPS Field Guidance
What is GPS guidance, how lightbar works, accuracy levels, and when you need auto-steer vs a phone app.
8 min readBest Tractor GPS Apps in 2026
Side-by-side comparison of the top tractor GPS apps: features, pricing, accuracy, and which one fits your operation.
6 min readHow Much Does Tractor GPS Cost?
Phone app ($30/yr) vs lightbar ($2,000) vs auto-steer ($10,000+). Full pricing breakdown for every budget.
5 min readHow to Reduce Overlap When Spraying & Plowing
Overlap wastes fuel, chemicals, and time. Learn how GPS guidance lines eliminate it — with before/after examples.
7 min read
GPS Guidance App for iPhone
FieldMate turns your iPhone into a tractor GPS guidance system. Parallel lines, real-time lightbar, 3D tractor on the map, and Apple Watch support — all for $29.99/year.
$29.99
per year
3-day
free trial
175+
countries
4
operations
Tractor GPS — Frequently Asked Questions
How accurate is iPhone GPS for farming?
iPhone GPS provides 3-5 meter accuracy, sufficient for most spraying, plowing, and seeding. For sub-inch accuracy, RTK hardware systems are needed — but cost $5,000+.
Can I measure my field area without a GPS device?
Yes — use our free Field Area Calculator above. Draw your field boundary on the satellite map and get instant acres or hectares. No app download needed.
How do I calculate acres per hour?
Use the formula: (width in feet x speed in mph x efficiency) / 8.25. Or use our free Acres Per Hour Calculator — just enter your numbers.
What is a GPS lightbar?
A lightbar is a visual indicator that shows how far your tractor is from the GPS guidance line. Green means on track, yellow means drifting, red means off course. FieldMate has a digital lightbar built in.
How much can GPS guidance save on fuel?
By eliminating overlap, GPS guidance typically saves 5-15% on fuel and input costs (seed, fertilizer, chemicals). The exact savings depend on field shape and operator experience.
Do I need internet to use tractor GPS?
GPS works without internet — satellites provide your position directly. Map tiles may need to load with signal first, but tracking and guidance work offline.