Free tools · Updated 5 August 2026

Free heating oil
calculators.

Fourteen free calculators built on today’s surveyed UK average of 92.5p per litre (5 August 2026). Start with the cost calculator (500 litres currently costs about £486 including VAT), the run-out date calculator, and the order timing tool, which tells you whether to buy now or wait.

Work out what you have

Tank capacity calculator

Measure your tank and get its true capacity, including part-full cylinders.

Uses proper circular segment maths for horizontal cylinders

Tank dip chart

Convert your dipstick reading in cm straight into litres.

Preset charts for 1000, 1200, 1360 and 2500 litre tanks

Run-out date calculator

See the date your oil runs out and the date to order by.

Seasonal usage model: winter burns around half your annual oil

Work out what it costs

Heating oil cost calculator

Litres in, delivered cost out, with VAT handled correctly.

500 litres costs about £486 at today’s average of 92.5p

Oil usage calculator

Estimate how many litres a house like yours burns per year.

A typical 3-bed detached home uses 1,500 to 1,900 litres a year

Annual heating cost calculator

Your yearly oil heating bill from your usage and county.

Based on today’s average of 92.5p per litre

VAT threshold checker

Check whether your order gets the 5% or 20% VAT rate.

Orders up to 2,300 litres qualify for 5% VAT

Decide when to order

Order timing calculator

Order now or wait? A decision aid built on your deadline and the recent trend.

Prices moved -0.5p in the last week

Delivery deadline planner

Work back from the date you need oil by to the date to order.

Standard lead time is about 7 days plus a 3 day buffer

Compare your options

Oil vs heat pump calculator

Honest running cost and payback comparison, either way.

Oil heat costs about 9.7p/kWh today; a heat pump about 8.9p/kWh

Heating fuel comparison

Oil vs mains gas vs LPG vs electric vs pellets, per kWh of heat.

Electricity unit rate 25.7p/kWh under the current Ofgem cap

Price per litre comparer

Normalise two or three quotes to a true pence per litre.

Today’s UK average: 92.5p per litre

Additive savings calculator

Do fuel additives actually pay for themselves? Usually not.

Manufacturer efficiency claims are unverified; we default conservative

Boiler service cost calculator

Annual service cost versus the cost of a breakdown.

A standard service runs £80 to £150

Ready to order?

Compare quotes from local suppliers for your postcode. UK average today: 92.5p per litre.