Metal Roof vs Asphalt Shingle Roof: 30-Year Cost Compared

What does the tie mean?

It means that over 30 years, a 2,000 sq ft roof costs exactly $18,000 whether it is metal or asphalt — one metal roof at $900 a square against two asphalt roofs at $450 a square. The metal roof costs twice as much to install and lasts two and a half times as long, and over 30 years those two facts cancel exactly: $18,000 each, to the dollar. The tie is exact on these defaults, not approximate — it is the arithmetic of 20 × $900 against 2 × 20 × $450. Change any one input and the tie breaks: $1 a year of energy saving flips it to metal, and $1 a square off the metal price flips it to metal too.

Three things to check before you trust the number

The replacement is the whole story. Over 30 years the metal roof is bought once and the asphalt roof twice — the second asphalt roof, bought in year 21, is the $9,000 that erases metal’s install disadvantage. Inside 20 years there is only one roof each, and asphalt wins by $9,000; inside 50 years there are three asphalt roofs, and metal wins by $9,000. The horizon, not the material, decides the winner on these prices — which is why the horizon is an input, not a fixed number.

The prices are mid-range defaults, not quotes. The $900 a square for metal sits inside the published 2026 installed range of about $550 to $1,400+ a square, and the $450 for asphalt sits inside about $280 to $800 a square — but real quotes move with the metal type, the shingle grade, the pitch, the tear-off, the region and the crew. A standing-seam metal roof can run well above $900 a square, and a three-tab shingle roof well below $450. Put your own quotes in: the calculator only needs the two per-square prices, the two lifespans and the horizon.

No saving is assumed in the headline — put your own numbers in. The energy and insurance savings both default to $0, because a metal roof’s cooling saving depends on the climate, the colour and the attic, and its insurance discount depends on the carrier and the state. A metal roof that saves $150 a year on energy wins by $4,500 over 30 years, and one that saves $100 a year on insurance wins by $3,000 — both pull ahead in year 21, when the second asphalt roof is bought. If your insurer offers no discount and your summers are mild, $0 is the honest input.

Worked example

On the defaults: a 2,000 sq ft roof; metal $900 a square with a 50-year life; asphalt $450 a square with a 20-year life; 30 years; no savings, no maintenance.

1. Find the squares: 2,000 ÷ 100 is 20 squares.
2. Find the install cost per roof: metal 20 × $900 is $18,000; asphalt 20 × $450 is $9,000.
3. Find how many roofs each side needs: metal ceil(30 ÷ 50) is 1 roof; asphalt ceil(30 ÷ 20) is 2 roofs.
4. Find the lifetime totals: metal 1 × $18,000 is $18,000; asphalt 2 × $9,000 is $18,000.
5. Find the winner: $18,000 − $18,000 is $0 — an exact tie.
6. Find the cost per year of service: metal $18,000 ÷ 50 is $360 a year; asphalt $9,000 ÷ 20 is $450 a year — metal is cheaper per year of roof, and still ties over 30 years, because the horizon cuts the metal roof’s life short.
7. Find the break-even year: metal is behind by $9,000 until year 21, when the second asphalt roof is bought and the totals meet — so metal never pulls ahead within the horizon.
8. With $150 a year of energy saving: metal drops to $13,500 over 30 years and wins by $4,500, pulling ahead in year 21.

Year by year: cumulative cost

Every branch, checked

• 2,000 sq ft, headline defaults: 2,000 sq ft, headline defaults: Metal $18,000.00 vs asphalt $18,000.00 over 30 years; tie at $18,000.00 (never ahead within the horizon). 2,000 sq ft, headline defaults — one metal roof at $18,000 against two asphalt roofs at $9,000 each: an exact tie at $18,000 over 30 years.
• Metal saves $150/yr on energy: Metal saves $150/yr on energy: Metal $13,500.00 vs asphalt $18,000.00 over 30 years; metal wins by $4,500.00 (break-even year 21). Metal saves $150 a year on energy — thirty years of $150 is $4,500, so metal wins by $4,500, pulling ahead in year 21, when the second asphalt roof is bought.
• Asphalt $550/sq: Asphalt $550/sq: Metal $18,000.00 vs asphalt $22,000.00 over 30 years; metal wins by $4,000.00 (break-even year 21). Asphalt $550 a square — two asphalt roofs at $11,000 each is $22,000, so metal wins by $4,000, pulling ahead in year 21.
• Metal $800/sq: Metal $800/sq: Metal $16,000.00 vs asphalt $18,000.00 over 30 years; metal wins by $2,000.00 (break-even year 21). Metal $800 a square — one metal roof at $16,000 against two asphalt roofs at $18,000, so metal wins by $2,000, pulling ahead in year 21.
• 20-year horizon: 20-year horizon: Metal $18,000.00 vs asphalt $9,000.00 over 20 years; asphalt wins by $9,000.00 (never ahead within the horizon). 20-year horizon — one roof each inside 20 years: metal $18,000 against asphalt $9,000, so asphalt wins by $9,000. The metal roof has not had time to earn its keep.
• 50-year horizon: 50-year horizon: Metal $18,000.00 vs asphalt $27,000.00 over 50 years; metal wins by $9,000.00 (break-even year 41). 50-year horizon — one metal roof at $18,000 against three asphalt roofs at $27,000, so metal wins by $9,000, pulling ahead in year 41, when the third asphalt roof is bought.
• Asphalt lifespan 30 years: Asphalt lifespan 30 years: Metal $18,000.00 vs asphalt $9,000.00 over 30 years; asphalt wins by $9,000.00 (never ahead within the horizon). Asphalt lifespan 30 years — one asphalt roof lasts the whole horizon, so asphalt wins by $9,000: $9,000 against $18,000.
• Metal saves $100/yr on insurance: Metal saves $100/yr on insurance: Metal $15,000.00 vs asphalt $18,000.00 over 30 years; metal wins by $3,000.00 (break-even year 21). Metal saves $100 a year on insurance — thirty years of $100 is $3,000, so metal wins by $3,000, pulling ahead in year 21.
• Asphalt maintenance $200/yr: Asphalt maintenance $200/yr: Metal $18,000.00 vs asphalt $24,000.00 over 30 years; metal wins by $6,000.00 (break-even year 21). Asphalt maintenance $200 a year — thirty years of $200 is $6,000 on top of the two roofs, so metal wins by $6,000, pulling ahead in year 21.
• 3,000 sq ft roof: 3,000 sq ft roof: Metal $27,000.00 vs asphalt $27,000.00 over 30 years; tie at $27,000.00 (never ahead within the horizon). 3,000 sq ft roof — everything scales by half again: metal $27,000 against asphalt $27,000, still an exact tie. Roof size changes the dollars, not the winner.

The reverses, worked backwards

• Largest whole metal price ($/sq) for metal to win over 30 years: 899 — at 899 the figures are Metal $17,980.00 vs asphalt $18,000.00 over 30 years; metal wins by $20.00 (break-even year 21); at the lower neighbor the figures are Metal $17,960.00 vs asphalt $18,000.00 over 30 years; metal wins by $40.00 (break-even year 21); at the upper neighbor the figures are Metal $18,000.00 vs asphalt $18,000.00 over 30 years; tie at $18,000.00 (never ahead within the horizon) — verdict: STEP.
• Smallest whole annual energy saving ($/yr) for metal to win: 1 — at 1 the figures are Metal $17,970.00 vs asphalt $18,000.00 over 30 years; metal wins by $30.00 (break-even year 21); at the lower neighbor the figures are Metal $18,000.00 vs asphalt $18,000.00 over 30 years; tie at $18,000.00 (never ahead within the horizon); at the upper neighbor the figures are Metal $17,940.00 vs asphalt $18,000.00 over 30 years; metal wins by $60.00 (break-even year 21) — verdict: STEP.
• Smallest whole horizon (years) for metal to win: 41 — at 41 the figures are Metal $18,000.00 vs asphalt $27,000.00 over 41 years; metal wins by $9,000.00 (break-even year 41); at the lower neighbor the figures are Metal $18,000.00 vs asphalt $18,000.00 over 40 years; tie at $18,000.00 (never ahead within the horizon); at the upper neighbor the figures are Metal $18,000.00 vs asphalt $27,000.00 over 42 years; metal wins by $9,000.00 (break-even year 41) — verdict: STEP.
• Largest whole asphalt price ($/sq) for asphalt to still win over 30 years: 449 — at 449 the figures are Metal $18,000.00 vs asphalt $17,960.00 over 30 years; asphalt wins by $40.00 (never ahead within the horizon); at the lower neighbor the figures are Metal $18,000.00 vs asphalt $17,920.00 over 30 years; asphalt wins by $80.00 (never ahead within the horizon); at the upper neighbor the figures are Metal $18,000.00 vs asphalt $18,000.00 over 30 years; tie at $18,000.00 (never ahead within the horizon) — verdict: STEP.
• Smallest whole asphalt lifespan (years) for asphalt to win over 30 years: 30 — at 30 the figures are Metal $18,000.00 vs asphalt $9,000.00 over 30 years; asphalt wins by $9,000.00 (never ahead within the horizon); at the lower neighbor the figures are Metal $18,000.00 vs asphalt $18,000.00 over 30 years; tie at $18,000.00 (never ahead within the horizon); at the upper neighbor the figures are Metal $18,000.00 vs asphalt $9,000.00 over 30 years; asphalt wins by $9,000.00 (never ahead within the horizon) — verdict: STEP.
• Largest whole horizon (years) for asphalt to win: 60 — at 60 the figures are Metal $36,000.00 vs asphalt $27,000.00 over 60 years; asphalt wins by $9,000.00 (never ahead within the horizon); at the lower neighbor the figures are Metal $36,000.00 vs asphalt $27,000.00 over 59 years; asphalt wins by $9,000.00 (never ahead within the horizon); at the upper neighbor the figures are Metal $36,000.00 vs asphalt $36,000.00 over 61 years; tie at $36,000.00 (never ahead within the horizon) — verdict: STEP.

What the defaults assume

The defaults are a 2,000 sq ft roof (20 squares), metal at $900 a square with a 50-year life against asphalt at $450 a square with a 20-year life, over 30 years, with no energy or insurance saving and no maintenance either side. They are a starting point, not a quote: your roof may be bigger or smaller, your quotes will differ, and the right answer for you is the one your numbers describe. There is no inflation, no discounting and no residual value in the model — a roof bought in year 21 costs the same as one bought today — and tear-off, permits and decking repairs are not separate line items: the per-square price is the all-in installed quote. The lifespans, 50 and 20 years, sit inside the published ranges of about 40 to 70 years for metal and 20 to 30 for asphalt. Put your numbers in, read the answer, and check the working before you use it.

These notes repeat in every explainer section because this page is built to be read start to finish: the replacement is the whole story; the prices are mid-range defaults, not quotes; and no saving is assumed in the headline.

Output · formula · meaning

Who uses this

• A homeowner choosing between two quotes — $18,000 once against $9,000 twice, and the horizon is the number that decides it.
• A homeowner staying put for decades — over 50 years metal wins by $9,000, because the asphalt roof is bought a third time.
• A homeowner selling soon — over 20 years asphalt wins by $9,000, because the metal roof never gets the time to earn its keep.
• A buyer comparing quotes — two per-square prices, two lifespans and a horizon, and the lifetime gap follows from them.

Accuracy & limitations

The arithmetic is exact on the numbers you type: 20 squares at $900 is $18,000, two asphalt roofs at $9,000 is $18,000, and the tie is exact. What the calculator cannot do is quote your roof: installed prices in 2026 run about $550 to $1,400+ a square for metal and about $280 to $800 a square for asphalt, and real quotes move with the metal type, the shingle grade, the pitch, the tear-off, the region and the crew. Lifespans are published ranges, about 40 to 70 years for metal and 20 to 30 for asphalt, not guarantees — hail, wind and installation quality move them. There is no inflation, no discounting and no residual value: a replacement in year 21 is priced at today’s dollars, and the metal roof’s remaining 20 years at the end of a 30-year horizon are worth nothing in the totals — which is why the cost per year of service ($360 against $450) tells a different story from the 30-year tie. Energy and insurance savings default to $0; get them from your utility bills and your insurer, not from this page. Treat the answer as a comparison of two quotes, not a quote itself.

Cite this calculator

Over 30 years a metal roof and an asphalt shingle roof cost exactly the same on a 2,000 sq ft roof — $18,000.00 each: one metal roof at $900 a square against two asphalt roofs at $450 a square. Metal saves $150 a year on energy and it wins by $4,500; a 50-year horizon and it wins by $9,000; a 20-year horizon and asphalt wins by $9,000. Largest whole metal price ($/sq) for metal to win over 30 years: 899. Smallest whole annual energy saving ($/yr) for metal to win: 1. Smallest whole horizon (years) for metal to win: 41. Largest whole asphalt price ($/sq) for asphalt to still win over 30 years: 449. Smallest whole asphalt lifespan (years) for asphalt to win over 30 years: 30. Largest whole horizon (years) for asphalt to win: 60. Source: Bright Side Kit, brightoolbox.com.

Frequently asked questions