Plan lawns, beds and hardscaping with confidence — instant answers for area, seed, sod, mulch, soil, gravel, pavers and more. 17 free tools, no sign-up.
Works on mobile · Updated October 2026
Measure, seed, sod and feed your lawn with the right amounts.
Work out the square footage or metres of any lawn shape.
Open calculator →Find the right seeding rate and total seed weight you need.
Open calculator →Estimate sod rolls, pallets and cost for instant lawn.
Open calculator →Match nitrogen rates to your lawn size and product analysis.
Open calculator →Materials by the bag, cubic yard or tonne — no more guesswork.
Calculate mulch volume, bags or bulk yards for any bed.
Open calculator →Estimate topsoil volume and weight for beds and fills.
Open calculator →Get gravel tonnage or cubic yards for paths and driveways.
Open calculator →Count pavers plus the sand and base material beneath them.
Open calculator →Work out how much compost to spread or blend into soil.
Open calculator →Estimate sand volume and weight for leveling and bedding.
Open calculator →Layout, spacing and soil volume for productive beds.
Find the soil blend and volume to fill your raised bed.
Open calculator →Get row and plant spacing for even, healthy growth.
Open calculator →Size up a bed and the soil or compost it needs.
Open calculator →Estimate how many plants fit in a given area.
Open calculator →Map out beds, paths and planting in one simple layout.
Open calculator →Keep everything thriving with the right water and feed.
Quick answers about gardening and landscaping calculators.
A gardening calculator is an online tool that turns your measurements into a concrete quantity or plan — how much grass seed, how many bags of mulch, or how many plants a bed will hold. You enter the dimensions, and it returns the amount you need to buy or apply.
Multiply length by width for square or rectangular lawns. For irregular shapes, split the lawn into smaller squares, rectangles, triangles or circles, calculate each one, and add the results. The Lawn Area Calculator does this automatically and accepts mixed shapes.
Mulch is measured by volume. Use the formula: area in square feet × depth in inches ÷ 324 = cubic yards. For example, a 300 sq ft bed at 3 inches deep needs about 2.8 cubic yards. The Mulch Calculator returns the exact figure for your dimensions and also converts it to bags.
Divide the bed area by the product of plant spacing and row spacing. A 10 ft × 4 ft bed with 12 inch × 12 inch spacing fits roughly 40 plants. The Plant Spacing and Plant Population calculators handle the grid maths for any spacing you choose.
Yes. Every calculator on GardenCalc is free to use, requires no account or sign-up, and runs entirely in your browser.