Health and safety

Disclaimer

FunRunGo calculates pace, time, and distance. It does not know your health, your training, the weather, or the course.

Not medical advice

Nothing on this site is medical advice, a diagnosis, or a treatment plan. It is not a medical device. It is not a substitute for a physician, physical therapist, or qualified coach. Talk with a clinician before you start running or before you change how hard you train, especially if you have a heart condition, chest pain, dizziness, diabetes, are pregnant, or are returning from injury or illness.

Running has risks

Distance running can cause muscle and joint injury, heat illness, hyponatremia, and, rarely, sudden cardiac events. Stop and get medical help if you have chest pain, fainting, unusual shortness of breath, or confusion. A pace table cannot tell you to keep going.

What the numbers are

The marathon pace calculator, the marathon pace chart, and the half marathon pace chart assume a flat, accurately measured course. They ignore hills, wind, heat, crowding, and how the day actually feels. Even splits and negative splits are illustrations. A faster second half is not safer, and it is not a promise of a better race. Many events close the course between about 6 and 8 hours. Confirm the time limit with the race.

Schedules

The 12-week half marathon schedule, the 20-week marathon schedule, the beginner marathon schedule, and the custom schedule were written for this site. They are not a personal coach, not a medical plan, and not a promise that you will finish or stay healthy. Skip or shorten a week when you are sore, ill, or short on sleep. A pace range cannot tell you to keep going.

Accounts, payment, and affiliate links

You do not need an account to calculate a pace. This site does not take payment and does not sell a race-day pack. Some pages include gear cards. When a card has an Amazon product ID, that link is an affiliate link and FunRunGo may earn a commission. Cards without a product ID are labeled placeholders and stay on this site. See the affiliate disclosure.

Names and trademarks

FunRunGo is an independent site. Race names, shoe brands, and event organizers mentioned in passing are not sponsors and are not affiliated with this site unless a page says so explicitly. Do not read a pace chart as an official result or a qualifying standard.