Why would I need to convert kWh to therms?

Common reasons to convert kWh to therms include: (1) comparing your UK gas bill against US energy benchmarks or appliance ratings given in therms; (2) working with US-manufactured heating equipment whose specifications are in BTU/hour or therms/hour; (3) reporting energy consumption in commercial gas contracts priced in p/therm or $/therm; (4) energy auditing and benchmarking against international standards that use therms. UK domestic bills always show kWh, so converting to therms is typically done for cross-reference purposes.

What is the difference between therms and dekatherms?

1 dekatherm (Dth) = 10 therms = 293.001 kWh. To convert kWh to dekatherms, divide by 293.001. The UK annual average of 11,500 kWh = 392.5 therms = 39.25 dekatherms. Dekatherms are used in commercial gas contracts and LNG pricing.

Is the kWh to therms conversion affected by calorific value?

No. Both kWh and therms are energy units, so their conversion is a fixed mathematical relationship (1 kWh = 0.034121 therms) that never changes regardless of gas type, calorific value or region. Calorific value is only relevant when converting gas volume (m³ or ft³) to energy (kWh or therms).

kWh to Therms Converter — Convert Kilowatt Hours to Therms 2026

Why Convert kWh to Therms?

UK domestic gas bills have been denominated in kilowatt hours (kWh) since 1999. However, converting kWh to therms is useful in several real-world scenarios: comparing your consumption against US appliance ratings or energy benchmarks, working with M&E engineers specifying US-manufactured heating equipment, reviewing commercial energy contracts that reference therms or dekatherms, and cross-referencing energy audit data from international sources.

0.034121
therms

1 kWh in therms

34.121
therms

1,000 kWh in therms

392.5
therms

UK avg/year (11,500 kWh)

3,412
BTU

1 kWh in BTU

The kWh to Therms Formula

This is the exact reverse of the therms-to-kWh conversion. Both kWh and therms are energy units, so the relationship between them is a fixed mathematical constant — no calorific value, volume correction factor or regional data is required.

⚡ kWh to Therms Formula

therms = kWh ÷ 29.3001

÷ 29.3001Exact conversion factor — always fixed

= × 0.034121Equivalent multiplication form

÷ 293.001Gives dekatherms (Dth) instead

× 3,412.14Gives BTU instead

How to Convert kWh to Therms — Step by Step

Find Your kWh Value

Locate the kWh figure on your UK gas bill — it may be labelled "energy used", "consumption (kWh)" or "units". Smart meter apps and in-home displays also show kWh. For annual consumption, add up all monthly or quarterly bills, or use a 12-month meter reading.

UK bill example: "Gas consumption: 958 kWh" Annual total: "Total this year: 11,500 kWh"

Divide by 29.3001

Divide the kWh value by 29.3001 to get therms. You can also multiply by 0.034121 — both give the same result. For dekatherms (Dth), divide by 293.001 instead.

11,500 kWh ÷ 29.3001 = 392.5 therms 11,500 kWh ÷ 293.001 = 39.25 Dth 958 kWh ÷ 29.3001 = 32.7 therms/month

Quick check: 1,000 kWh ≈ 34.1 therms. Use this to sense-check large conversions.

Interpret Your Result

Compare your therms result against relevant benchmarks. For US household comparison: a typical American home uses 500–700 therms/year. For commercial contracts: most UK Dth contracts specify daily quantities (Dth/day). For appliance ratings: US boiler output is often quoted in BTU/hour or therms/hour.

UK avg home: 392.5 therms/year (11,500 kWh) US avg home: ~600 therms/year (~17,580 kWh) 1 Dth/day: ~10.2 kWh/hour continuous flow

Worked Examples

Monthly Low

175 kWh (summer)

5.97 therms

175 ÷ 29.3001 = 5.97 therms
≈ 0.597 Dth

Monthly Average

958 kWh

32.70 therms

958 ÷ 29.3001 = 32.70 therms
UK avg monthly

Monthly Winter

1,800 kWh (Jan)

61.43 therms

1800 ÷ 29.3001 = 61.43 therms
≈ 6.14 Dth

Annual Low

8,000 kWh

272.9 therms

8000 ÷ 29.3001 = 272.9 therms
Ofgem low benchmark

Annual UK Average

11,500 kWh

392.5 therms

11500 ÷ 29.3001 = 392.5 therms
Ofgem medium 2026

Annual High

17,000 kWh

580.3 therms

17000 ÷ 29.3001 = 580.3 therms
Ofgem high benchmark

kWh to Therms Conversion Table 2026

Full reference table for converting kWh to therms and dekatherms. Highlights show Ofgem consumption benchmarks. For the reverse, see our therms to kWh converter.

kWh	Therms	Dekatherms (Dth)	BTU	MJ	Equiv. m³ (CV 39.5)
1	0.03412	0.003412	3,412	3.600	0.089 m³
10	0.3412	0.03412	34,120	36.00	0.894 m³
50	1.706	0.1706	170,600	180.0	4.47 m³
100	3.412	0.3412	341,200	360.0	8.94 m³
250	8.531	0.8531	853,100	900.0	22.4 m³
500	17.06	1.706	1,706,000	1,800	44.7 m³
958 (UK avg/month)	32.70	3.270	3,269,000	3,449	85.7 m³
1,000	34.12	3.412	3,412,000	3,600	89.4 m³
2,000	68.24	6.824	6,824,000	7,200	178.9 m³
5,000	170.6	17.06	17,060,000	18,000	447.3 m³
8,000 (Ofgem low)	272.9	27.29	27,290,000	28,800	715.7 m³
11,500 (Ofgem medium)	392.5	39.25	392,500,000	41,400	1,029 m³
15,000	511.8	51.18	511,800,000	54,000	1,342 m³
17,000 (Ofgem high)	580.3	58.03	580,300,000	61,200	1,521 m³
20,000	682.5	68.25	682,500,000	72,000	1,789 m³
50,000	1,706	170.6	1,706,000,000	180,000	4,473 m³

m³ equivalent uses CV 39.5 kWh/m³, VCF 1.02264. Ofgem benchmarks highlighted. Source: Ofgem TDCVs 2026.

UK vs US Gas Consumption in Therms — 2026

Converting UK kWh to therms lets you meaningfully compare British and American household gas consumption. The difference is striking: US homes are generally larger, less well insulated, and often use gas for clothes drying and air conditioning backup heating — resulting in roughly 50–70% higher gas use than the UK average.

🇬🇧 UK Benchmarks (Ofgem 2026)

Low household273 therms/yr

Medium (average)392 therms/yr

High household580 therms/yr

Monthly average32.7 therms/mo

Daily average1.07 therms/day

🇺🇸 US Benchmarks (EIA 2026)

Low household~350 therms/yr

Medium (average)~600 therms/yr

High household~900+ therms/yr

Monthly average~50 therms/mo

Daily average~1.64 therms/day

🔥 Need the Reverse? Convert Therms Back to kWh

Use our therms to kWh converter — or see your full UK gas usage breakdown with our usage calculator.

🔥 Therms to kWh → 📊 Gas Usage Calc 💷 Gas Bill Calc

UK Regional Calorific Values 2026

If you also need to convert your therms result into approximate gas volume (m³), the table below shows regional UK calorific values for 2026. Use the mid-range CV for your region to estimate how many cubic metres correspond to your kWh or therms figure.

UK Region	CV Range (kWh/m³)	Band	kWh per m³	Therms per m³
🇬🇧 UK National Average	38.5 – 40.5	Average	≈ 11.18 kWh	≈ 0.381 therms
London & South East	39.0 – 41.5	Above Avg	≈ 11.44 kWh	≈ 0.390 therms
South West England	38.8 – 41.0	Average	≈ 11.34 kWh	≈ 0.387 therms
East Midlands	39.0 – 40.8	Average	≈ 11.34 kWh	≈ 0.387 therms
West Midlands	38.5 – 40.5	Average	≈ 11.18 kWh	≈ 0.381 therms
Yorkshire & Humber	38.0 – 40.2	Average	≈ 11.11 kWh	≈ 0.379 therms
North West England	37.8 – 40.0	Below Avg	≈ 11.06 kWh	≈ 0.377 therms
North East England	37.5 – 39.8	Below Avg	≈ 10.98 kWh	≈ 0.374 therms
Scotland	37.2 – 40.0	Below Avg	≈ 11.01 kWh	≈ 0.376 therms
Wales	38.0 – 40.2	Average	≈ 11.11 kWh	≈ 0.379 therms

Therms/m³ = (CV × 1.02264 ÷ 3.6) ÷ 29.3001. Mid-range regional CV used. Source: National Grid / Xoserve 2026.

Frequently Asked Questions

How many therms is 1 kWh?

1 kWh = 0.034121 therms (exactly 1 ÷ 29.3001). This is a fixed mathematical relationship between two energy units — it never changes regardless of gas type, region or supplier. To convert any kWh to therms, divide by 29.3001. Use the converter above for any value.

How do I convert kWh to therms?

Divide your kWh value by 29.3001. Equivalently, multiply by 0.034121. Formula: therms = kWh ÷ 29.3001. Key examples: 1,000 kWh = 34.12 therms; 11,500 kWh = 392.5 therms; 17,000 kWh = 580.3 therms. For dekatherms, divide by 293.001 instead.

How many therms does a UK home use per year?

Converting Ofgem's 2026 benchmarks: Low = 273 therms/year (8,000 kWh); Medium/average = 392.5 therms/year (11,500 kWh); High = 580 therms/year (17,000 kWh). For a monthly average, divide by 12: the UK average works out to ~32.7 therms/month.

Why would I convert kWh to therms?

Common reasons include: comparing your UK bill against US household benchmarks; specifying or comparing US-manufactured heating equipment rated in BTU/hr or therms/hr; commercial UK gas contracts priced in p/therm; international energy benchmarking; and energy auditing across UK and US building standards. UK domestic consumers rarely need therms day-to-day — kWh is the standard UK billing unit.

How many therms is 1,000 kWh?

1,000 kWh = 34.12 therms (1,000 ÷ 29.3001 = 34.121). Other key conversions: 500 kWh = 17.06 therms; 2,000 kWh = 68.24 therms; 5,000 kWh = 170.6 therms; 10,000 kWh = 341.2 therms; 11,500 kWh (UK avg) = 392.5 therms. Full table is above.

What is a dekatherm (Dth) and how do I convert kWh to Dth?

A dekatherm (Dth) = 10 therms = 293.001 kWh. To convert kWh to dekatherms, divide by 293.001. The UK annual average of 11,500 kWh = 39.25 Dth. Dekatherms are used in commercial and wholesale gas contracts — most UK Dth pricing is for daily flow rates (Dth/day).

Does the kWh to therms conversion depend on calorific value?

No. Both kWh and therms are energy units — their conversion is a fixed constant (1 kWh = 0.034121 therms) that never changes. Calorific value only comes into play when converting gas volume (m³ or ft³) to energy. If you need to convert a UK meter reading to therms, first convert m³ to kWh using our M3 to kWh calculator, then divide by 29.3001.

How do I convert kilowatts (kW) to therms per hour?

Divide kW by 29.3001 to get therms/hour. Example: 100 kW ÷ 29.3001 = 3.413 therms/hour. This is because 1 kW = 1 kWh/hour, so the same conversion factor applies to power as to energy. Used when comparing UK (kW) rated boilers and heating plant against US (therms/hr) specifications.

kWh toTherms Converter