Every calculation you need,
in one place.
Free calculators for home, energy and finance decisions. Estimate materials, plan costs and calculate savings with practical tools.
Building & Renovation
Laminate Flooring
Multi-room support, pack calculator with waste factor and total cost estimate.
Open calculator →Generic Flooring
Universal flooring calculator for any material — parquet, vinyl, carpet.
Open calculator →Tile Calculator
Ceramic, porcelain, or stone. Tile count, grout, and adhesive quantities.
Open calculator →Paint — Walls
Paint volume for walls. Deducts windows and doors automatically.
Open calculator →Paint — Ceiling
Ceiling-specific paint calculator with coverage rates and coats.
Open calculator →Wallpaper
Roll estimator with pattern repeat, offsets, and wall dimensions.
Open calculator →Insulation
Rolls, batts, or loose-fill. Coverage and R-value planning.
Open calculator →Openings
Windows & doors area calculator — for deduction from wall totals.
Open calculator →Roof Area
Footprint × pitch multiplier. Supports degrees and rise:12 ratio.
Open calculator →Roof Materials
Bill of Materials for metal, tiles, shingles, or flat roofs.
Open calculator →Deck & Terrace
Boards, joists, and fasteners for decks and outdoor platforms.
Open calculator →Fence & Railing
Posts, rails, pickets, and concrete for post footings.
Open calculator →Concrete & Screed
Volume, bags, and mix ratios for slabs, paths, and floor screeds.
Open calculator →Energy & Savings
Solar Panel Calculator
System size, panel count, annual savings, and payback period estimate.
Open calculator →Heat Loss Calculator
Estimate heat loss through walls, roof, windows and floor for any room.
Open calculator →Insulation Savings
Calculate annual energy savings and payback period from upgrading insulation.
Open calculator →LED Strip Calculator
Plan LED strip zones, calculate PSU wattage, amperage, and running costs.
Open calculator →Heat Pump ROI Calculator
Calculate annual savings, payback period and 20-year net return from switching to a heat pump.
Open calculator →Electricity Cost Calculator
Track appliance running costs, compare tariffs, and see monthly bill estimates.
Open calculator →Home Energy Savings Calculator
Stack insulation, heat pump, solar, LED and thermostat upgrades to see combined savings, payback and net value.
Open calculator →EV Home Charging Cost Calculator
Calculate your annual EV charging cost, cost per km and savings versus petrol or diesel with multi-year projection.
Open calculator →Home Battery Backup Calculator
Calculate backup duration, peak-shaving savings, solar self-consumption boost and payback for any home battery system.
Open calculator →Window Energy Loss Calculator
Calculate how much heat your windows lose, the annual cost and how much you would save by upgrading to double or triple glazing.
Open calculator →Heat Pump Running Cost Calculator
Calculate the annual running cost of your heat pump and compare it to gas, oil or direct electric heating. See exact savings and payback period.
Open calculator →Solar Battery Savings Calculator
Calculate how much a home battery adds to your solar savings. See self-consumption rate, annual saving vs exporting and payback period.
Open calculator →HVAC Running Cost Calculator
Calculate the annual electricity cost of your air conditioning. Enter cooling capacity, EER and usage hours — see cost per hour, annual total and CO₂ emissions.
Open calculator →Dynamic Electricity Price Calculator
See what it costs to run each appliance at peak, standard and off-peak rates — and how much you save by shifting usage to cheaper hours.
Open calculator →Appliance Electricity Cost Calculator
Calculate running costs for up to 8 appliances — daily, monthly and annual breakdown with bar chart comparison.
Open calculator →Standby Power Cost Calculator
Find out what devices left on standby cost per year — with CO2 estimate and smart plug payback.
Open calculator →Dehumidifier Running Cost Calculator
Daily, monthly, seasonal and annual electricity cost of running a dehumidifier — by wattage, hours and electricity rate.
Open calculator →Air Conditioner Running Cost Calculator
Daily, monthly and seasonal electricity cost of running an air conditioner — by BTU, kW or EER rating.
Open calculator →Underfloor Heating Cost Calculator
Daily, monthly and seasonal electricity cost of running electric underfloor heating — cables, mats and foil.
Open calculator →Water Heater Cost Calculator
Compare annual running costs for electric tank, heat pump, gas and tankless water heaters.
Open calculator →Boiler vs Heat Pump Calculator
Compare annual running costs and payback period for your current boiler against a heat pump.
Open calculator →Radiant Floor Heating Calculator
Electric and hydronic radiant floor heating running costs — separate models for each system type.
Open calculator →Finance & Property
Home Renovation Estimator
Full project budget — room by room, trade by trade, with shopping list.
Open calculator →Mortgage Calculator
Monthly repayments, total interest, and amortisation schedule for any loan.
Open calculator →Renovation ROI Calculator
See if your renovation adds value — profit, ROI %, rental yield and payback period.
Open calculator →Energy Upgrade ROI Calculator
Payback period, lifetime ROI and net savings for solar, heat pumps, insulation and more.
Open calculator →Home Renovation ROI Calculator
Which upgrades add the most value to your home? Estimated resale value return for 11 renovation types.
Open calculator →Solar Panel Payback Calculator
How long before your solar panels pay for themselves? Payback period, lifetime ROI and 25-year net savings.
Open calculator →Heat Pump Payback Calculator
How long before your heat pump pays back its installation cost? Payback period, lifetime ROI and net savings.
Open calculator →EV Charger Payback Calculator
How long before your home EV charger pays for itself? Payback period, lifetime net savings and ROI.
Open calculator →Battery Payback Calculator
Home battery payback via grid arbitrage or solar pairing — with degradation and optional battery replacement.
Open calculator →Room Renovation Cost Calculator
Trade-by-trade planning estimate for a single room. Adjusts for renovation scope and local market cost level.
Open calculator →Bathroom Renovation Cost Calculator
Trade-by-trade planning estimate for a bathroom renovation. Covers plumbing, tiling, electrical and waterproofing.
Open calculator →Kitchen Renovation Cost Calculator
Trade-by-trade planning estimate for a kitchen renovation. Covers cabinetry, plumbing, electrical and tiling.
Open calculator →Renovation Budget Planner
Set a total budget, allocate it across rooms by priority, and see what remains after contingency. A planner, not a cost estimator.
Open calculator →Smart Home
Smart Thermostat Savings
Estimate annual savings from setback schedules and smart heating control.
Open calculator →Smart Home Energy Savings
Select smart devices — thermostat, lighting, plugs and more — and see total annual savings and payback period for your whole smart home setup.
Open calculator →Smart Lighting Savings
Calculate annual savings from switching to smart LED lighting — LED efficiency plus automation (auto-off, dimming, scheduling) with payback period.
Open calculator →Smart Plug Savings
Find out how much standby power costs you — and whether smart plugs will pay for themselves. Per-device breakdown with payback period.
Open calculator →Heat Pump ROI
Coming soon