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MATERIAL CALCULATOR

Mulch calculator.

Convert the area and chosen mulch depth into bulk volume or full bags.

KEEP YOUR PLAN

Give your project a name.

Save your measurements and quotes on this device. No account needed.

My saved projects

YOUR MEASUREMENTS

Use the depth and allowance from your project specification.

Bag sizes, weight & pricing +

Bag counts and prices apply to the main material only. Enter your supplier’s density to calculate weight.

Compare bags with bulk delivery +

Use the bag size and units above. Compare the same product at your supplier’s quoted prices. Enter small-bag contents above and its price below. Include each delivery charge; enter zero for pickup.

Bulk-bag quote · optional third option

Compare small bags, bulk bags and a loose load side by side. Each price is optional; include delivery once for each option.

Minimum and increment use the bulk quote unit. For half-yard orders, enter 0.5 as the increment. Zero uses the exact estimate. Check taxes, unloading charges and access separately. Weight quotes need your supplier’s bulk density.

Your soil blend +

Enter two materials and their percentages if you want to calculate a blend. Choose the proportions for your planting plan.

Gouache illustration of a timber raised bed with soil, leafy plants and terracotta pots.
AI-generated illustration, not a photograph of a completed project.
BEFORE YOU ORDER

Getting a useful estimate

Use the volume printed on the bag. Weight is not a reliable substitute for bag volume.

Measure the space you need to fill. Rectangles use length and width; circles use diameter. For several sections, choose combined areas and add rectangles, then subtract exclusions. The final area must be greater than zero.

Topping up existing mulch

Measure the bed area you are topping up and enter only the extra depth you plan to add. Including the existing mulch depth would overestimate the new material.

University of Minnesota Extension explains how organic and inorganic mulches differ and how to manage them. Use that guidance to choose your material. The calculator converts your area and depth into volume or full bags.

University of Minnesota Extension: Mulching for soil and garden health

Volume formula

Volume = area × depth × (1 + allowance ÷ 100)

Allowance applies once to each volume layer. No density or compaction factor is assumed. If buying by weight, enter the density for your supplier’s product in the units shown.

A worked example

An example 18-foot by 6-foot rectangle filled 2 inches deep needs 18.000 cubic feet, or 0.666667 cubic yards, without allowance. A 10% allowance gives 20 cubic feet. These are arithmetic examples, not recommended depths.

Calculate a two-component blend

Use internal bed or container measurements and the remaining depth to fill. An optional blend divides the total between two components at percentages you supply. The percentages must total 100. Full bags round up and may leave extra material.

Buying and checking quantities

Enter the volume printed on a bag, or its mass alongside supplier density. Counts round up to full bags. Costs use the purchasing unit and price you enter. Delivery is separate; labor and installation are outside this estimate. Copy or print your list to check with your supplier.

Sources & what they cover

  • NIST SI conversion factorsNational Institute of Standards and Technology

    Exact US customary and SI conversion factors; no material or installation recommendations.

    Source checked
  • Mulching for soil and garden healthUniversity of Minnesota Extension

    Organic and inorganic mulch distinctions and replenishment; no depth preset imported.

    Source checked

We check what each reference covers. A source check does not mean a specialist has reviewed this tool. You supply the depths, densities, prices and blend proportions.

Operated by Pete CallaghanUpdated Not yet independently reviewedHow we check our toolsReport a correction