The deal, in plain language

What the service is

eveneffort is a free calculator that redistributes a goal finish time across a marathon course according to its elevation profile and, where a forecast is available, the expected race-day weather. There is no account to create and nothing to subscribe to. We may change, add or remove features, courses included, at any time, and we may take the site down without notice.

Pacing advice, not medical advice

This is the part worth reading properly. The splits we produce are a mathematical model’s estimate, not a training prescription and not medical advice. They assume the goal time you gave us is one you are actually fit to run; the model has no way to know otherwise, and it will happily build you a beautiful plan for a time beyond your current fitness. Fueling cues are generic guidance based on a carbohydrate target you set, not a nutrition plan for your body.

Running a marathon carries real risk of injury and, in rare cases, worse. You are responsible for your own training, pacing and safety on the day, and for deciding to slow down or stop regardless of what any band on your wrist says. Consult a doctor before starting endurance training, and follow the instructions of race officials and medical staff over ours. Conditions on the day such as heat, wind, a course change or how you slept will always outrank a plan made in advance.

Accuracy

We build each course from published elevation data and we work hard to get it right, but course routes change between editions, GPS elevation carries error, and weather forecasts are forecasts. The underlying energy-cost model is drawn from published research (see our methodology) and is a well-supported approximation of how gradient affects running economy. It is not a law of nature, and it is not tuned to you personally. We do not warrant that any split, adjusted finish time or forecast is accurate, and you should treat all of it as a starting point for your own judgement.

Printed bands

You can print a paceband yourself for free, forever. We also sell a physical one for $9.99, made by hand and posted to you. Payment is handled by Stripe, and placing an order means accepting our shipping & refunds terms, which set out delivery times and how refunds work. Please check your goal time and course before ordering, because each band is printed for one specific plan.

Acceptable use

Use the site for planning your own races. Don’t attempt to disrupt it, scrape it at volume, or hammer the forecast endpoint. It sits on a rate-limited third-party API, and abusing it degrades the site for other runners. Don’t resell the pacing output as your own product. Uploading is rate limited for the same reason.

Courses you upload

You can upload a route file to build a chart for a course we don’t hold. Only the route matters to us: we keep the geometry, the name you give it, and nothing else. Upload only routes you have the right to share.

Your course lives at an unguessable link, and that link is the only way back to it. There are no accounts here, so we cannot recover it for you. It is unlisted: it never appears in the course list, the map or the rankings. It is not secret, though, so anyone you send the link to can see it.

Uploaded courses are kept for 90 days and then deleted. Ordering a printed paceband keeps yours permanently, because the band has the link on it. To limit abuse of an open upload endpoint we store a one-way, salted hash of your IP address alongside the course; it is used only to count recent uploads, cannot be turned back into an address, and is never shared. We may remove an uploaded course that is unlawful or is being used to abuse the service.

Ownership

The site, its design, its written content and our course data compilation belong to us. The pace chart you generate is yours: print it, share it, wear it, no permission needed. The underlying research we build on belongs to its authors and is cited on the methodology page. Race names and trademarks belong to their respective organisers; we are not affiliated with, endorsed by, or sponsored by any marathon or race organisation.

Liability

The service is provided “as is”, without warranties of any kind, to the fullest extent the law allows. We are not liable for injury, a missed goal time, a bad race, or any indirect or consequential loss arising from using the site or a band. Where liability cannot be excluded, it is limited to what you actually paid us, which for most people is nothing. Some jurisdictions don’t allow these exclusions, in which case they apply only as far as they legally can, and nothing here removes your statutory consumer rights.

Governing law and changes

These terms are governed by the laws of the United States. If they change we will update the date at the top of this page, and continuing to use the site means accepting the revised version. Questions go to morenog150@gmail.com. See also our privacy policy.