Six free tools for the measurements that gardening actually turns on — area, height, depth, zone and timing. None of them need an account, and none of them sell you anything.
If you are starting from scratch, work out your lawn area first. Seed rates, fertiliser quantities, mulch volumes and sod orders all depend on that one figure.
Lawn Square Footage Calculator
Measure your lawn area before you buy seed, fertiliser or a mower. Every other calculation on this page starts with this number.
Grass Cutting Height Calculator
Find the right mowing height for your grass type and season, and see how much of the leaf you should be removing in one pass.
Mulch Coverage Calculator
Work out how many bags or cubic yards of mulch a bed needs at the depth you want, so you order once instead of twice.
Sod Calculator
Estimate how much sod your lawn needs, including the extra you should allow for cuts, curves and awkward corners.
Plant Hardiness Zone Finder
Look up your growing zone to check whether a plant will survive your winters before you put it in the ground.
Frost Date Calculator
Find your average first and last frost dates, the two dates that decide when sowing and planting out are safe.
Using the numbers
A calculator gives you a figure; what you do with it is the part that matters. Our guides on the right cutting height, how often to mow and mulching explain the reasoning behind the numbers these tools produce.