Oddly Measured

How many kilometres of spaghetti have I eaten?

Spaghetti is sold by weight but eaten by length. Here is how far yours would stretch.

Real maths • Your answers stay on your device

What you'll need

  • Roughly how long you have been eating spaghetti
  • How many spaghetti meals you have in a month
  • How much dry spaghetti goes in per serve

Dry weight, before cooking. The presets show their gram values.

Your number appears here.

Answer the questions and press Show me my weird number. Everything is worked out on your own device.

How we work this out

We count your spaghetti meals, multiply by the dry weight you cook per serve, then convert weight into length using a measured reference strand. The conversion treats a strand as a cylinder and uses a published measured diameter and dry density.

Step by step

  1. Work out lifetime meals: years × 12 months × meals per month.
  2. Multiply by dry grams per meal to get total dry pasta.
  3. Divide by 3.5834 g per metre, the lineal mass of the reference strand.
  4. Divide by 1,000 to get kilometres.

What this does not claim

  • Spaghetti thickness varies by brand and by number. The reference strand is one measured 1.78 mm Barilla spaghetti, not a universal standard.
  • Dry weight is used throughout. Cooked pasta weighs roughly two to three times more because of the water it absorbs.
  • Portion size is your own estimate, weighed before cooking.

Sources

Every externally sourced value used by this calculator, with its full derivation and its limits.

about 3.58 g per metre

Lineal mass of one reference dry spaghetti strand, derived from a measured 1.78 mm diameter and a measured apparent dry density of 1.440 g/cm³.

Treat a strand as a cylinder.
diameter = 1.78 mm = 0.178 cm, so radius = 0.089 cm
volume per metre = π × 0.089² cm² × 100 cm
mass per metre = volume × 1.440 g/cm³ ≈ 3.5833759789 g/m

Limits: Spaghetti thickness varies by brand and shape. This uses one representative measured reference strand rather than implying every spaghetti product has the same lineal density.

Status: verified · next review 2027-08-17