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Garden Watering Cost Calculator
How much does it really cost to water your garden? Our free garden watering cost calculator works it out in seconds. Enter your garden size, how often you water and your water rate, and you will see your seasonal watering bill in pounds and litres — plus how much of it you could wipe out by harvesting free rainwater in a water butt. No sign-up, no email required, and it works in metric or imperial. Built for UK gardens, UK water prices and UK weather.
What does watering your garden really cost?
Enter your garden details to see your summer watering bill — and how much of it a water butt could wipe out. Rainwater is free, plants prefer it, and hosepipe bans don’t apply to it.
Lawn, beds and pots you actually water — a typical UK lawn is 50–150 m².
UK metered average incl. sewerage ≈ £2.46. Check your bill for the exact rate.
–of mains water used per season
–your seasonal watering bill
–you could save with rainwater
Pick a water butt setup to see your saving.
Shop water butt & linking kits →How we work this out
Sessions per season = weekly sessions × 4.33 weeks × months. Water per session = area × litres per m². Cost uses your £/m³ rate (1 m³ = 1,000 litres). Rainwater saving assumes each butt refills about 10–16 times per season depending on region, capped at your actual usage. Estimates only — your garden, weather and tariff will vary.How to cut your garden watering bill
If the number above made you wince, the fix is simpler than you might think. Rainwater is free, your plants actually prefer it to treated tap water, and collecting it is a one-afternoon job. A single 210-litre water butt refills many times over a British summer, and linking two or three butts together multiplies what you can store — our water butt kits include the connectors, diverters and linking sets to do exactly that. Best of all, hosepipe bans do not apply to stored rainwater, so a well-planned setup keeps your garden green even during restrictions. And if your watering setup itself needs an upgrade, from hoses and spray guns to sprinklers and timers, browse our garden watering equipment to put every litre exactly where it is needed.
Garden watering costs — your questions answered
How much does it cost to water a garden in the UK?
For a metered household paying around £2.46 per cubic metre (water plus sewerage), watering a typical 60 m² garden twice a week from May to September uses roughly 26,000 litres and costs in the region of £60-£65 per season. A larger garden, daily watering or a thirsty lawn can push that well past £200. Use the calculator above with your own tariff for a personalised figure.
Do hosepipe bans apply to water butts?
No — temporary use bans restrict hosepipes connected to the mains supply. Water you have collected in a water butt is yours to use, including through a hosepipe or watering can, so rainwater harvesting is the simplest legal way to keep watering during a ban.
How much water does a garden hose use?
A typical garden hose delivers around 500-1,000 litres per hour depending on pressure and nozzle — which is why even short watering sessions add up quickly on a metered supply. Watering with a rose or spray gun at the roots, early in the morning or in the evening, wastes far less to evaporation.
How much money can a water butt save?
It depends on your usage and rainfall in your region. A single 210-litre butt that refills a dozen times over the season captures around 2,500 litres — roughly £6 of mains water — while two or three linked butts on a decent roof area can cover a third or more of a typical garden’s watering. The calculator above shows the saving for your exact setup.
How accurate is this calculator?
It is an estimate built on sensible UK averages: 4.33 weeks per month, your chosen litres per square metre, and regional refill rates for water butts. Your real bill depends on your tariff, the weather and how you water — so treat the result as a good guide, not a quote. Your exact water rate is on your bill, and you can type it straight into the calculator.