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Home Calculators
62 free home calculators with clear, detailed guides.
All Home Calculators
Air Source Heat Pump Savings Calculator
Calculate potential savings from installing an air source heat pump. Compare gas boiler vs heat pump running costs and payback period.
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Appliance Lifespan & Replacement Calculator
Calculate expected lifespan of home appliances and find replacement timing. Compare repair vs replace costs for white goods.
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Bathroom Renovation Cost Calculator UK (2024)
Calculate UK bathroom renovation cost by size, spec, and scope. Suite, tiling, plumbing, electrics, and installation for 2024 prices.
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Boiler Efficiency & Savings Calculator
Calculate how much you could save by upgrading your boiler. Compare old boiler efficiency against a new A-rated condensing boiler.
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Boiler Size Calculator
Calculate the correct boiler size (kW output) for any property. Based on number of radiators, bathrooms, and property size.
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Broadband Speed & Data Usage Calculator
Calculate how much broadband speed you need for your household. Find out how long downloads take and whether your package is fast enough.
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Carpet Calculator
Calculate how much carpet you need for any room. Accounts for room dimensions, roll width, pattern matching, and fitting waste.
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Cavity Wall Insulation Payback Calculator (UK)
Calculate UK cavity wall insulation payback. Annual heating savings, ECO4 grant eligibility, and lifetime ROI for typical homes.
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Compost Bin Volume & Output Calculator
Calculate the right compost bin size for your household and garden. Find composting time, output volume, and ideal C:N ratio.
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Concrete Calculator
Calculate how much concrete you need for any slab, post, or footing. Get volumes in cubic metres and bags needed.
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Condensation Risk & Dew Point Calculator
Calculate dew point, condensation risk on cold surfaces, and relative humidity. Identify surfaces at risk of mould growth in your home.
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Double Glazing Cost & Payback Calculator (UK)
Calculate annual heat loss savings from double or triple glazing replacement. Find the payback period and CO2 savings.
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Double Glazing Savings Calculator
Calculate annual energy savings from installing or upgrading double glazing. Compare single glazing, standard double glazing, and triple glazing.
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Driveway Cost Calculator UK (Block Paving, Tarmac, Gravel)
Calculate UK driveway cost by material and area. Block paving, tarmac, resin, gravel, and concrete prices with installation for 2024.
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EV Home Charging Cost Calculator
Calculate the cost of charging your electric vehicle at home. Compare home charging vs public chargers and see your annual fuel cost saving vs petrol.
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Electric Car vs Petrol Running Cost Calculator (UK)
Compare UK running costs of an electric car vs petrol or diesel equivalent. Annual fuel, road tax, servicing, depreciation.
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Electricity Cost Calculator
Calculate the electricity cost of any appliance. Enter wattage, usage hours, and your unit rate to find daily, monthly and annual running costs.
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Firewood Calculator (Cords, Volume & Cost)
Calculate firewood quantity and cost. Convert between cords, cubic metres, and loads, and estimate how long a wood supply will last.
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Flooring Calculator
Calculate how much flooring, laminate, hardwood, or carpet you need for any room. Includes waste allowance and pack coverage.
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Garden Area Calculator
Calculate the area of any garden, lawn, or plot. Add multiple sections including circles, rectangles, and triangles for an accurate total.
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Garden Fence Length & Cost Calculator
Calculate total fence length, number of panels and posts, and total cost for fencing any garden perimeter.
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Garden Pond Volume & Pump Size Calculator
Calculate garden pond volume, the right pump size for circulation and filtration, fish stocking capacity, and liner size needed.
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Garden Room Cost Calculator (UK 2026) — vs Extension
Calculate garden room costs in 2026 by size and spec, including foundations and electrics. See whether a garden room is cheaper than a house extension.
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Garden Shed — Material & Cost Calculator
Calculate materials, cost, and planning permission requirements for a garden shed or outbuilding. Timber, roofing felt, and concrete base quantities.
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Gas Boiler & Central Heating Running Cost Calculator
Gas boiler and central heating running cost calculator: work out the cost per hour and per day to run your heating based on boiler power and energy price.
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Greenhouse Heating Calculator (Heater Size & Cost)
Calculate the heater size needed to keep your greenhouse frost-free or warm. Heat loss by glazing, area, and target temperature, plus running cost.
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Heat Pump vs Gas Boiler Payback Calculator (UK)
Calculate UK heat pump installation payback vs gas boiler. Includes BUS grant, COP, electricity vs gas costs, and lifetime running cost.
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Heating Cost Calculator (Gas & Electric)
Calculate your annual gas central heating cost and compare with electric heat pump costs. Based on Ofgem price cap rates and real home sizes.
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Home Battery Storage Payback Calculator (UK)
Calculate UK home battery storage payback with solar. Self-consumption, off-peak charging, and lifetime savings for Tesla Powerwall and similar.
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Home Heating Cost & Comparison Calculator
Calculate annual home heating costs for gas boiler, heat pump, electric, and oil. Compare heating systems and find the cheapest option for your home.
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House Extension Cost Calculator UK
Calculate the estimated cost of a house extension in the UK. Covers single-storey, double-storey, kitchen extensions, and loft conversions with regional.
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Insulation R-Value & U-Value Calculator
Calculate R-value (thermal resistance) and U-value (heat transfer coefficient) for wall, roof, and floor constructions.
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Kitchen Cabinet & Unit Cost Calculator
Calculate how many kitchen units you need and estimate total kitchen cost. Works for any kitchen layout — straight, L-shape, U-shape, and galley.
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Kitchen Renovation Cost Calculator UK (2024)
Calculate UK kitchen renovation cost by spec, size, and finish. Units, worktops, appliances, plumbing, electrics, and installation.
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Lawn Care Calendar & Feed Calculator (UK)
Calculate lawn fertiliser quantities and find the right time for feeding, scarifying, aerating, and seeding through the UK year.
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Lawn Seed Calculator
Calculate how much grass seed you need for any lawn area. Covers new lawns, overseeding, and bare patch repair.
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Loft Conversion Cost Calculator
Estimate the cost of a loft conversion in the UK by type — Velux, dormer, hip-to-gable, or mansard. Based on current 2024 UK builder rates.
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Loft Insulation Calculator
Calculate how much loft insulation you need and estimate the annual heating savings from insulating to 270mm depth.
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Loft Insulation Payback & Savings Calculator
Calculate the payback period and annual savings from loft insulation. Find if you qualify for free insulation through ECO4 or the Great British Insulation.
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Moving House Cost Calculator
Calculate the total cost of moving house — removals, stamp duty, conveyancing, surveys, and all hidden costs that buyers overlook.
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Paint Calculator
Calculate how many litres of paint you need for any room. Works for walls, ceilings, doors, and trim. Covers single and double coat requirements.
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Paint Coverage Calculator
Calculate exactly how many litres of paint you need for any room. Accounts for doors, windows, coats, and waste to give you a precise quantity.
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Paint Mixing Ratio Calculator
Calculate how much of each colour to mix when creating custom paint shades. Work out tint ratios and quantities for any batch size.
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Petrol vs Electric Car Cost Calculator
Compare the total cost of owning a petrol, diesel, hybrid, or electric car over 3 and 5 years. Includes purchase price, fuel, insurance, and depreciation.
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Pipe Flow Rate & Pressure Drop Calculator
Calculate water flow rate through pipes, pressure drop, and minimum pipe size for domestic plumbing. Based on Hazen-Williams and Darcy-Weisbach equations.
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Radiator BTU / Output Calculator
Calculate the BTU output required for any room. Find the correct radiator size based on room dimensions, construction, and heat loss factors.
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Radiator Size Calculator (BTU & kW)
Calculate the correct radiator size in BTU and kW for any room. Based on room dimensions, insulation, and window size for accurate heat output.
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Rainwater Collection Yield Calculator
Calculate how much rainwater you can harvest from your roof. Annual litres from roof area and rainfall, with collection efficiency factored in.
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Rainwater Harvesting Tank Size Calculator
Calculate how much rainwater you can collect from your roof and the right tank size for your garden irrigation needs.
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Room Area Calculator
Calculate the floor area and perimeter of any room shape. Rectangular, L-shaped, and irregular rooms all supported.
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Secondary Glazing Cost Calculator (UK)
Estimate the cost of secondary glazing per window and for your whole home. Compare secondary glazing prices against double glazing for insulation and noise.
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Smart Meter & Time-of-Use Tariff Savings Calculator
Calculate savings from switching to a smart time-of-use electricity tariff. Find how much you can save by shifting usage to cheaper hours.
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Smart Meter Tariff & Peak vs Off-Peak Savings Calculator
Calculate savings from switching to a smart time-of-use electricity tariff like Octopus Agile or Go. Compare peak vs off-peak usage costs for EV charging.
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Solar Panel Payback & Savings Calculator
Calculate solar panel payback period, annual savings, and 25-year ROI for any UK home. Includes Smart Export Guarantee rates.
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Swimming Pool Volume Calculator
Calculate the volume of any swimming pool in litres and gallons. Works for rectangular, circular, and L-shaped pools. Includes chemical dosing guidance.
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TV Size & Viewing Distance Calculator
Calculate the ideal TV screen size for your room, or the optimal viewing distance for your TV. Based on resolution and recommended viewing angles.
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Tile Calculator
Calculate how many tiles you need for any floor or wall. Accounts for tile size, grout spacing, and waste percentage.
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UK Council Tax Band & Annual Bill Estimator
UK: Calculate your expected council tax bill based on band and local authority area. Find discounts, exemptions, and how to challenge your band.
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Wallpaper Calculator
Calculate how many rolls of wallpaper you need for any room. Accounts for pattern repeat, drops, doors, and windows.
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Water Butt Size Calculator
Work out what size water butt you need for your garden. Match storage capacity to roof collection and garden watering demand.
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Water Meter Savings Calculator
Calculate whether you would save money by switching to a water meter. Compare water meter bills vs rateable value billing for your household.
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Window Blind & Curtain Size Calculator
Calculate the correct blind or curtain dimensions for any window. Covers roller, venetian, Roman blinds, and full-length curtains with exact measurement guide.
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About our home calculators
These home calculators help with renovation, decorating, and running a household: paint coverage, flooring and carpet area, tiling, room dimensions, energy and heating costs, garden rooms, double glazing, and more. Each gives a clear quantity or cost estimate with the method explained.
Getting quantities right saves money and second trips to the merchants, so these tools include sensible waste allowances and the guides share the practical know-how — how paint coverage varies by surface, why area not diameter matters, and what hidden costs to budget for on bigger projects.
Every calculator is free and needs no sign-up, giving you a reliable starting estimate for planning and budgeting home projects.