Useful Online Calculators for Home, Garden & Life
Fast, free tools for garden, home, energy, household and pets – no sign-up required.
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Garden & Outdoor
Pool Chemistry Calculator
Calculate the amount of chlorine your pool needs based on volume, current and target level – for safe pool water.
Open tool →Lawn Seed Calculator
Calculate how much lawn seed you need for your area, matched to the site (sun, shade or sports lawn).
Open tool →Garden Soil Calculator
Calculate how much soil or mulch you need for your garden beds, based on area and desired layer depth.
Open tool →Lawn Irrigation Calibrator
Calculate your sprinkler's precipitation rate and the ideal run time for an evenly watered lawn – free, no sign-up required.
Open tool →Garden Hose Pressure Calculator
Estimate the water pressure at the hose end based on length, diameter and source pressure – ideal for sprinklers & irrigation.
Open tool →Compost Maturity Calculator
Estimate when your compost will be ready to use based on material, moisture and turning frequency.
Open tool →Garden Waste Container Calculator
Calculate how many containers or bags you need for your green waste, sorted by amount and material.
Open tool →Watering Interval Planner
Plan your watering interval and amount based on soil type, plant type and weather – healthy plants without guesswork.
Open tool →Potting Soil Mix Calculator
Calculate the right amounts for your soil-compost-sand mix – tailored to beds, raised beds or planters.
Open tool →Paving Stone Calculator
Calculate how many paving stones you need for a patio or driveway, including joints, waste and bedding material.
Open tool →House & Renovation
Paint Calculator
Calculate how much paint you need for your walls, including deductions for windows and doors.
Open tool →Tiles Calculator
Calculate how many tiles you need for your project, including cutting waste for a clean layout.
Open tool →Grout Quantity Calculator
Calculate the grout you need based on tile format, joint width and depth – buy exactly the right amount.
Open tool →Anchor Load Calculator
Estimate the allowable load of an anchor based on base material and anchor type – for safe home fixings.
Open tool →Wall Filler Calculator
Calculate the amount of filler compound needed for smooth walls before painting or wallpapering.
Open tool →Screw Requirement Calculator
Calculate the number of screws needed for your project, based on area, spacing or pieces per element.
Open tool →Luminous Flux Calculator
Calculate the lumen output your room needs for the right brightness when choosing new lights.
Open tool →Lumen Lux Watt Calculator
Convert watts to lumens (old bulb to LED) and calculate the illuminance (lux) for your room.
Open tool →Radiator Sizing Calculator
Determine the right radiator heating output for your room based on area, insulation and ceiling height.
Open tool →Craft & DIY
Wood Cutting Cost Calculator
Calculate material and cutting costs for your wood project for a realistic budget before you start.
Open tool →Concrete Mix Calculator
Calculate the cement, sand, gravel and water you need for your concrete project by volume and mix type.
Open tool →Threaded Rod Load Calculator
Estimate the allowable tensile load of a threaded rod based on diameter and strength class.
Open tool →Roof Batten Requirement Calculator
Calculate the number of roof battens you need based on roof area and batten spacing.
Open tool →Corrugated Roof Sheet Calculator
Calculate the number of corrugated roof sheets you need for a roof or wall based on area, sheet width and overlap.
Open tool →Deck Substructure Planner
Plan the joist count and spacing for your deck substructure for a stable, safe terrace.
Open tool →Decking Boards Calculator
Calculate how many decking boards you need for your area, including waste and fixing material.
Open tool →Energy & Climate
Electricity Cost Calculator
Calculate the electricity cost of your devices per day, month and year based on wattage, use and price.
Open tool →Heat Pump COP Calculator
Calculate your heat pump's efficiency (COP) and cost per kWh of heat to check if it runs efficiently.
Open tool →Live Power Usage Estimator
Estimate the current power consumption and cost of a running device based on wattage and electricity price.
Open tool →Heating Cost Optimizer
Compare your heating costs against average values and find your savings potential by heating type.
Open tool →PV Battery Storage Calculator
Calculate the recommended battery storage size for your solar system based on usage and generation.
Open tool →Air Purifier CADR Calculator
Calculate the CADR output your room needs to make sure your air purifier is actually powerful enough.
Open tool →E-Mobility
EV Range Calculator
Calculate the real-world range of your EV at speed, in the cold, uphill and towing a trailer – with WLTP comparison and 26 popular models.
Open tool →EV Towing Check
Can your EV tow the trailer over your route? Towing limit, nose weight, charging stops and trip time for horse trailers, caravans and more.
Open tool →Household & Daily Life
Detergent Dosage Calculator
Calculate the correct detergent dosage based on load size, soil level and water hardness.
Open tool →Dishwasher Salt Calculator
Calculate the right dishwasher salt dosage for your machine based on your local water hardness.
Open tool →Dryer Time Calculator
Estimate your dryer's drying time based on load size, program and fabric type.
Open tool →Fridge Temperature Optimizer
Check whether your fridge temperature is set ideally for longer food life and lower power use.
Open tool →Room Volume Calculator
Calculate the volume of a room for AC units, air purifiers and more from length, width and height.
Open tool →Humidity Risk Calculator
Calculate the dew point and mold risk in your room based on temperature and relative humidity.
Open tool →Pets
Dog Food Calorie Calculator
Calculate your dog's daily calorie needs based on weight, age and activity level.
Open tool →Aquarium Filter Calculator
Calculate the right filter flow rate for your aquarium based on tank volume and stocking level.
Open tool →Terrarium Humidity Planner
Determine the right target humidity for your terrarium based on species and native climate.
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