Hay and Forage Calculator

Estimate total hay needed in pounds, tons, and bales from herd size, animal weight, feeding days, body-weight intake percentage, and a waste allowance.

Frequently Asked Questions

What intake percentage should I use?

About 2% of body weight for mature idle animals on good hay, 2.5-3% for growing, lactating, or cold-stressed stock. Cold temperatures increase maintenance requirements - add about 1% of body weight per 10 degrees below the lower critical temperature (around 20 degrees F for a dry cow with a winter coat).

How do I cut waste?

Use a hay ring or cone feeder for round bales, feed only what is cleaned up in a day, and keep hay off wet ground. This single change can cut waste from 30-40% down to under 10%. Proper storage (on gravel or pallets, away from soil contact) can save another 15-20% on outer-layer spoilage.

Should I weigh my bales?

Yes if you can. Bale weight is the biggest source of error in this calculation, and a bathroom-scale spot check or a bale scale beats a guess. Round bales vary from 600 to over 1,500 lb depending on size, moisture, and hay type. Small squares also vary - 40 to 70 lb is common.

Why plan for extra feeding days?

Winters run long and pastures green up late. Adding two to three weeks of feeding days is cheap insurance against a frantic, overpriced hay hunt in March. A common rule of thumb is to plan for 30-45 days more than the expected last frost date for your area.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.