All Garden Calculators

All calculators

20 free calculators, grouped by job. Each one shows its formula, a worked example and common mistakes — no sign-up, calculations run in your browser.

Soil & Beds

• Soil Volume Calculator
• Mulch Calculator
• Container Soil Calculator
• Soil Mix Calculator
• L-Shaped Bed Calculator
• Soil Cost Calculator

Planting & Seeds

• Plant Spacing Calculator
• Seed Quantity Calculator
• Seed Starting Calculator
• Row Planting Calculator

Water

• Watering Calculator
• Drip Irrigation Calculator
• Rainwater Calculator

Lawn & Materials

• Lawn Seed Calculator
• Fertilizer Calculator
• Compost Calculator
• Gravel Calculator
• Concrete Calculator
• Paver Calculator

Harvest & Planning

• Harvest Yield Calculator

Guides that explain the jobs behind these numbers: All guides →. How every number is calculated: Methodology →.