How Much CO2 Does Cycling Actually Save? A Sydney Rider's Guide

"Cycling is better for the environment" is one of those claims everyone repeats and almost no one quantifies. So here's the actual math - the same math RideAware runs every time you finish a ride - plus what it adds up to over a real Sydney commute.

Why this is worth measuring at all

Transport is one of the largest single contributors to Australia's greenhouse gas emissions, and it's one of the few sectors where an individual's daily choices - not just policy or infrastructure - move the number directly. Every trip taken by bike instead of car is emissions that simply don't happen, no offset required (DCCEEW National Greenhouse Gas Inventory).

The exact formula RideAware uses

We didn't want to publish a rounded-off, marketing-friendly number, so here's precisely what happens under the hood:

CAR_CO2_GRAMS_PER_KM = 191
co2_saved_grams = round(distance_km × 191)

191 grams of CO2 per kilometre is the Australian national average emissions factor for registered light vehicles, sourced from the Department of Climate Change, Energy, the Environment and Water's National Greenhouse Accounts Factors 2025. It's a flat baseline: for every kilometre you ride, RideAware counts the CO2 an average car would have emitted covering that same distance.

A few things this number deliberately does not account for, in the interest of being transparent rather than generous:

• No adjustment for vehicle type or occupancy - it assumes one average light vehicle, not a shared ride, EV, or larger vehicle
• No accounting for cycling's own footprint - the modest energy cost of the extra food a rider burns isn't subtracted
• No assumption that every ride replaces a car trip - some rides are recreational, not a substituted commute

It's a conservative, single-source-of-truth baseline rather than an optimistic one - which matters if you're going to put a number on a blog post and stand behind it.

What that looks like on a real Sydney commute

Sydney's average one-way commuting distance is around 14 to 15km (BITRE). Using RideAware's formula on a 15km commute:

• One-way ride: 15 km × 191g = 2,865g (2.87 kg) CO2 saved
• Round-trip commute day: 30 km × 191g = 5,730g (5.73 kg) CO2 saved
• A five-day riding week: roughly 28.6 kg CO2 saved
• A working year (46 weeks, allowing for leave): roughly 1,318 kg, over 1.3 tonnes of CO2 saved by riding a commute instead of driving it

That's the same arithmetic running quietly in the background of every ride you log. If you're weighing up whether that commute is realistic, our complete 2026 Sydney cycling safety guide covers the routes and rules side of it.

Where you can see your own number

This isn't just a blog-post calculation - it's live in the app:

• Per ride: your ride summary shows a "CO2 saved vs driving" figure for that specific trip
• All-time: your profile shows a running "CO2 saved all-time" total across every ride you've logged, whether recorded via GPS, manual entry, or Strava sync - all using the same 191g/km baseline, so every number in the app is comparable

Because each ride's saving is calculated and stored the moment you save it, your historical rides keep their original figure even if the underlying national average is updated in a future year - so your all-time total stays an honest record of what was true at the time, not a number that quietly shifts under you.

The bottom line

You don't need to buy an e-bike, join a campaign, or change your whole lifestyle to make a measurable dent - a genuinely ordinary commute, ridden instead of driven, adds up to over a tonne of avoided CO2 a year using Australia's own government emissions data. RideAware just does the arithmetic for you, ride by ride, so the number is sitting there next to your route the next time you open the app.

Riding more also means knowing the law: see our full NSW cycling road rules guide for 2026.

Sources: DCCEEW National Greenhouse Gas Inventory, September 2025, DCCEEW National Greenhouse Accounts Factors 2025, BITRE - Australia's commuting distance: cities and regions.