Is £41 a year the official UK wash cost?

No. It is 183 × 0.85 kWh × 26.32p, a worked example. Change any of the three inputs and the pounds move. Ofgem publishes the unit rate, not a nappy-wash tariff.

Should I use Eco 40–60 or a 60°C cotton cycle?

Use the programme you run. The Energy Label kWh is for Eco 40–60. Which? describes a cold rinse then a wash at the temperature in the care instructions. A 60°C cycle on the same machine is usually more kWh — read that figure rather than scaling Eco by a guess.

Do I count the household wash I already did on Tuesdays?

Count extra cycles, or the extra kWh if you only made an existing cycle hotter or longer. If nappies replaced a load you already ran, the extra electricity is closer to zero. The honest yearly add-on is the difference, not every spin of the drum.

Can I use last year's 33p/kWh tables?

Only as history. A May 2023 retailer wash table used £0.33/kWh. The Ofgem Direct Debit averages on 10 September 2026 were 26.11p then 26.32p. Rebuild the energy column.

Guides · Nappies · Cost

How much extra do cloth nappy washes cost per year in the UK?

Updated 10 September 2026 · Checked 10 September 2026 · By MayTally research desk — Checked against official UK sources

What is the yearly laundry formula?

Australian calculators (Clean Cloth Nappies) show the right shape and the wrong tariff. A UK yearly add-on is:

Yearly extra = (washes × kWh per wash × £ per kWh) + (washes × m³ per wash × £ per m³, if metered) + (washes × detergent per wash). There is no official 2026 pence-per-wash to copy.

Washes — Which? (11 February 2026): clean them every two to three days. That is about 122 to 183 nappy-specific cycles a year if that drum is extra to the household wash you already ran.
kWh per wash — the Energy Label shows kWh per 100 Eco 40–60 cycles. Divide by 100. A hotter cotton 60 programme uses more; read the manual or a meter, do not guess.
£ per kWh — the unit rate on the bill, or Ofgem's published Direct Debit averages: 26.11p (1 July–30 September 2026) and 26.32p (1 October–31 December 2026).
Water — litres on the same label ÷ 1,000. Only if the home is metered. Unmetered rateable-value bills do not rise with extra litres.
Detergent — pack price ÷ doses on the pack you bought. A May 2023 retailer sheet listed own-brand doses in the low tens of pence; that is a dated shop snapshot, not a 2026 official dose.

How do I run the numbers on my own machine?

Count nappy washes in a typical fortnight Which? every two to three days is 5–7 nappy washes a fortnight. Multiply by 26. NHS change rates (10–12 a day early, 6–8 later) change how full the drum is, not the official kWh on the label.
Read kWh per 100 cycles, then divide Example only: 85 kWh / 100 = 0.85 kWh. Cotton 60 on the same machine may be 1.3–1.8 kWh — use the programme you actually run.
Multiply by the unit rate on the bill 0.85 × 26.32p = 22.4p electricity for that example wash at the October–December 2026 Direct Debit average. Prefer your region's rate if the bill shows one.
Add water only with a meter Thames Water from 1 April 2026: £2.7346/m³ clean + £1.4721/m³ wastewater. A 70-litre wash is 0.07 × £4.2067 = 29.4p. Other companies publish their own charges schemes.
Add detergent from the pack, then annualise Do not publish a made-up 2026 pence-per-wash as the answer. Sum the three lines and multiply by washes per year.

What does a worked electricity year look like?

Swipe sideways for the full table

Worked yearly electricity only (swap in your label kWh)
Washes / year	kWh / wash (example)	Yearly £ at 26.11p (Jul–Sep 2026)	Yearly £ at 26.32p (Oct–Dec 2026)
122 (every third day)	0.85	About £27	About £27
183 (every other day)	0.85	About £41	About £41
183 (every other day)	1.50	About £72	About £72

Unit rates are Ofgem Great Britain Direct Debit averages checked 10 September 2026. kWh values are labelled examples, not a national average wash. Standing charges are excluded. A May 2023 retailer wash table used £0.33/kWh — rebuild those 33p rows before you quote them.

Electricity is often the smaller cash line once you stop using 2023's 33p/kWh. Metered water at 20–40p a wash can match it. Detergent depends on the pack. A tumble dryer is a fourth line — see dryer savings.

Does extra laundry raise an unmetered water bill?

No volumetric line. Unmetered households pay a fixed charge. Extra nappy litres do not print on that bill. Metered households pay the company's £/m³ on every extra cubic metre.

Swipe sideways for the full table

Worked Thames Water volumetric add-on (metered only, from 1 April 2026)
Litres per wash (from the machine label)	m³	£ per wash at £4.2067/m³	£ per year at 183 washes
50	0.050	About 21p	About £38
70	0.070	About 29p	About £54
100	0.100	About 42p	About £77

£4.2067/m³ is Thames Water's published £2.7346 clean + £1.4721 wastewater from 1 April 2026, checked 10 September 2026. Other water companies set different volumetric rates. Unmetered homes should treat this table as £0. Fixed standing water charges are not extra laundry.

Which laundry figures should I not copy across?

A$ yearly examples from Clean Cloth Nappies — different electricity and water markets.
4.78p per nappy wash from a May 2023 UK retailer table that used 33p/kWh, own-brand detergent and 14 nappies per load. Recalculate.
A single 2026 pence-per-wash sold as national fact. The formula is the fact.
Standing charges on energy or water — they do not start because you bought cloth nappies.

In shortThe yearly extra is washes × labelled kWh × the Ofgem or bill unit rate, plus metered litres × your company's £/m³, plus detergent. Show the working. Do not publish a made-up 2026 wash price.

How do I sit this yearly add-on next to disposable packs?

MoneyHelper 2024, via Which?, already folded laundry into a £400 reusable total over 2.5 years. This page isolates the annual add-on so you can park it beside your own supermarket spend. Against Aldi Mamia the laundry line is the whole contest once the kit is paid. Against leading-brand packs the laundry line is usually the smaller number.

NHS Best Start's ~4,500 changes before potty training tell you how many changes you avoid buying as packs. They do not set the kWh.

Questions parents ask

Is £41 a year the official UK wash cost?: No. It is 183 × 0.85 kWh × 26.32p, a worked example. Change any of the three inputs and the pounds move. Ofgem publishes the unit rate, not a nappy-wash tariff.
Should I use Eco 40–60 or a 60°C cotton cycle?: Use the programme you run. The Energy Label kWh is for Eco 40–60. Which? describes a cold rinse then a wash at the temperature in the care instructions. A 60°C cycle on the same machine is usually more kWh — read that figure rather than scaling Eco by a guess.
Do I count the household wash I already did on Tuesdays?: Count extra cycles, or the extra kWh if you only made an existing cycle hotter or longer. If nappies replaced a load you already ran, the extra electricity is closer to zero. The honest yearly add-on is the difference, not every spin of the drum.
Can I use last year's 33p/kWh tables?: Only as history. A May 2023 retailer wash table used £0.33/kWh. The Ofgem Direct Debit averages on 10 September 2026 were 26.11p then 26.32p. Rebuild the energy column.

Sources

Official pages first. If this page and the official page disagree, the official page wins.

Ofgem — Energy price cap unit rates and standing charges — checked 10 September 2026
Which? — Are reusable nappies worth it? — checked 10 September 2026
NHS — How to change your baby's nappy — checked 10 September 2026
NHS Best Start — Changing a nappy — checked 10 September 2026
Thames Water — Metered customers (volumetric rates from 1 April 2026) — checked 10 September 2026
The Nappy Lady — Do reusable nappies really save you money? (May 2023 wash table) — checked 10 September 2026

This is information, not a guarantee of any payment, and not medical, legal or product-safety advice for your home. Prices and rules change; figures carry the date they were checked. Recall status comes from official records only — a product we cannot find is not a safety all-clear. Tell us if we got a fact wrong.