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function calculate() { document.mulchForm.cubicYards.value = (document.mulchForm.length.value/3) * (document.mulchForm.width.value/3) * (document.mulchForm.depth.value/36); document.mulchForm.bags.value = document.mulchForm.cubicYards.value*13.5; } Mulch Calculator How much mulch, gravel or soil will you need? *Fill in the boxes below, then click on Calculate. Round-up your results to ensure complete … Continue reading →