Free tools for homeowners and diyers
Know how much to buy and what it will cost, before you start your first project.
If you have never done a big job on your house, the first questions are practical. How much paint? How many tiles, with the ones that break? How much concrete for a slab, or gravel for a drain? What will the whole project cost once the small things are added up? And is it really cheaper to do it yourself? These tools answer those, with the working shown.
They are written for people new to DIY, and they work in metric or imperial and in any currency. You bring your own measurements, prices and quotes. The tools give estimates and general information, and they never tell you what your project needs by law. Rules on permits, building regulations and which work needs a qualified person differ by country and place, so check yours first.
Made for homeowners and diyers
Money & Pay
Renovation Budget Calculator
Plan a home project step by step, with the cost of each stage and a running total: garage conversion, bathroom, kitchen, patio, raised beds and more.
Money & Pay
DIY vs Hire Calculator
Is it cheaper to do it yourself? Counts materials, tools, mistakes and the value of your time against a quote.
Quantities & Measurement
Room Paint Calculator
How much paint a room needs from its size, doors, windows and coats, using the coverage on the tin.
Quantities & Measurement
Tile Calculator
How many tiles and boxes to buy for a floor or wall, with an allowance for cuts and breakages.
Quantities & Measurement
Flooring Calculator
How much laminate, vinyl or wood flooring to buy, with waste included, in whole packs.
Quantities & Measurement
Concrete Slab Calculator
How much concrete for a slab, path or base from its length, width and thickness, in cubic metres or yards.
Quantities & Measurement
Mulch and Topsoil Calculator
How much mulch, topsoil or compost a garden bed needs from its area and depth, and how many bags.
Quantities & Measurement
Pond Planner: Liner and Cost Calculator
Plan a garden pond step by step: liner size, the cost of each stage, the pump to look for, a fish check and running costs.
Quantities & Measurement
Epoxy Resin Calculator
How much epoxy resin a river table, countertop or mould needs, with waste, layers and the mix ratio.
Quantities & Measurement
French Drain Gravel Calculator
How much gravel a French drain needs from the trench size, minus the pipe and the topsoil on top.
Quantities & Measurement
Firewood Cord Calculator
How many cords a firewood stack or woodshed holds, and how big a shed you need.
Quantities & Measurement
Loft Insulation Calculator
How many rolls of loft insulation for one or two layers, and the depth they build up to.
Plan a whole project
Project budget
Garage Conversion Budget Planner
Work through a garage conversion in the order it happens, with the cost of each stage as you go.
Project budget
Bathroom Renovation Budget Planner
Work through a bathroom refit in the order it happens, with the cost of each stage as you go.
Project budget
Patio Cost Calculator
Work through a patio in the order you will build it, with the stone, sand and slabs worked out for you.
Project budget
Raised Bed Garden Cost Calculator
Work through building raised beds in order, with the soil and frames worked out for the size you choose.
How these fit the working year
Planning and budgeting
Plan a whole project stage by stage, from a garage conversion to a patio or raised beds, with a running total and a safety margin, and work out whether doing it yourself really saves money.
Decorating
Work out how much paint a room needs, how many tiles to buy with the ones that break, and how much flooring with the waste.
🎨 Room Paint Calculator🧱 Tile Calculator🪵 Flooring Calculator
Groundwork and building
Find the volume of concrete for a slab or path, and the gravel for a French drain.
Garden and outdoors
Size and cost a garden pond with its pump and fish, order mulch or topsoil for a bed, and plan a woodshed.
🐟 Pond Planner: Liner and Cost Calculator🌿 Mulch and Topsoil Calculator🔥 Firewood Cord Calculator
Comfort and making
Work out loft insulation rolls and how much epoxy resin a river table or countertop needs.
More tools homeowners and diyers use
Quantities & Measurement
Land Area Calculator
Area of a plot from its measurements, in acres, hectares, square feet and square metres. Rectangles, triangles, circles and any corners.
Money & Pay
Percentage Calculator
Percentage increase, decrease, change and difference, plus X% of a number, discounts, tips, marks, weight loss, pay rises and win rate.
Research & History
Historical Inflation Calculator
What was money worth in the past? US CPI data from 1913, UK RPI from 1948.
Time & Dates
Date Calculator
Add or subtract days from any date, or count the days between two dates.
Time & Dates
Week Number Calculator
Find the ISO week number for any date, with start and end dates for that week.
Time & Dates
Countdown Timer
Live countdown to any date or event, with a shareable link to send to your team.
Questions
I have never done a home project. Where do I start?
Start with the renovation budget calculator for your kind of project, so you see every cost before you spend. Then work out the quantities with the paint, tile, flooring or concrete calculators, and check whether DIY really saves you money.
Do these tools tell me what permits or building rules apply?
No. Rules on permits, building regulations and which work needs a qualified person differ by country and place, and they change. Check with your local authority before you start, especially for structural, electrical, plumbing and gas work.
Do they work in metric and imperial, and in my currency?
Yes. Choose metres, centimetres and litres or feet, inches and gallons, and pick a currency from the list. Your choices are remembered in this browser only.
Do they give prices for materials or labour?
No. Prices vary too much by place and time. The boxes show faint example numbers, and you type your own quotes and prices.
Is anything stored or sent?
The calculators run in your browser, so what you type stays on your device. Your unit and currency choices are remembered in this browser.
These are estimates and general information, not building, legal or professional advice. Costs, rules, permits and building regulations differ by country and place, so use your own figures and check the rules where you live. Structural, electrical and gas work should be done by a qualified person.