AllMyCalculators

Silage Requirement Calculator

Plans the silage for a housed period.

From your ration plan. Use the feed ration calculator to work it out from dry matter.

days
%

Spoilage at the top, sides and face, and at the feed barrier.

kg/m³

Around 600–800 kg/m³ when well compacted, depending on dry matter and rolling.

t/ha

From your records for this crop, per season.

Silage to make
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.

Silage actually fed —
Clamp volume —
Clamp floor area —
Crop area needed —
Reading this —

The formula

silage needed = animals × daily amount × days ÷ (1 − losses) clamp volume = weight ÷ density

Losses are divided out, because the clamp has to hold enough to allow for what is lost.

What to watch out for

Add a reserve for a long winter or a poor second cut. A clamp needs a feed-out face wide enough that fresh silage is exposed each day, or the face heats and spoils.

Frequently Asked Questions

How much silage do 50 cows need for 150 days?

At 35 kg a day with 15% losses, 309 t.

How do I find a clamp’s silage tonnage?

Volume × density. A clamp of 300 m³ at 700 kg/m³ holds 210 t.