24 free calculators · ft & metres
Measure once. Buy exactly what you need.
Simple calculators for concrete, gravel, tiles, paint, turf — and the questions dog and cat owners ask most. No sign-up, instant answers.
Home & Garden
Materials for building, DIY and landscaping projects.
Sand Calculator
Estimate loose sand for a garden bed, play area or landscaping project.
Bark Calculator
Work out how much bark chipping mulch covers your garden beds at your chosen depth.
Tree Spacing Calculator
Plan a rectangular tree planting grid using your chosen row spacing, tree spacing and edge setback.
Concrete Calculator
Work out how much concrete you need for a slab, patio, shed base or footing — in cubic yards, cubic metres and pre-mix bags.
Tile Calculator
Calculate how many tiles you need for a floor, wall or splashback, including a cutting and breakage allowance.
Mulch Calculator
Find out how much mulch or bark you need to cover a flower bed, border or play area.
Topsoil Calculator
Work out the volume and approximate weight of topsoil needed for a new lawn, raised bed or levelling job.
Gravel Calculator
Calculate how much gravel, pea shingle or aggregate you need for a driveway, path or drainage area.
Wallpaper Calculator
Find the number of wallpaper rolls needed for a room or feature wall, allowing for pattern repeat.
Paint Calculator
Work out how much paint you need for a room, including multiple coats and deductions for doors and windows.
Decking Calculator
Find how many deck boards you need for a new deck, based on its size and the boards you plan to use.
Brick Calculator
Work out how many bricks you need for a single-skin wall, including mortar joints and a breakage allowance.
Plasterboard & Drywall Calculator
Find how many plasterboard (drywall) sheets you need for walls or a ceiling.
Sand & Cement Calculator
Work out the cement bags and sand needed for a floor screed, render or mortar bed.
Patio Calculator
Calculate the paving slabs, sub-base and bedding sand for a new patio.
Turf & Sod Calculator
Find how many rolls of turf, sod or artificial grass you need for a new lawn.
Fence Paint Calculator
Calculate litres or gallons of fence paint or stain for your garden fence.
Plant Spacing Calculator
Find how many plants you need for a bed or border at a given spacing.
Pets
Health, age and feeding tools for dog and cat owners.
Dog Pregnancy Calculator
Estimate when your dog's puppies are due, plus the key milestones of canine pregnancy.
Cat Pregnancy Calculator
Estimate your cat's due date and the main stages of feline pregnancy.
Dog Age Calculator
Convert your dog's age into human years — taking size into account, because big dogs age faster.
Cat Age Calculator
Find out how old your cat is in human years and which life stage they're in.
Puppy Weight Calculator
Estimate how big your puppy will be as an adult, based on its current weight and age.
Dog Food Calculator
Find out how many calories — and cups of food — your dog needs each day.
Why use HandyCalc?
Ordering too little material means a second delivery fee; ordering too much wastes money. Each calculator here explains the formula it uses, works in both imperial and metric units, and includes a sensible waste allowance so your estimate matches what suppliers actually sell.
Results are estimates. For structural work, confirm quantities with your builder or supplier, and for pet health questions always speak with your vet.