Marathon pacing is linear math at a fixed distance: total time divided by marathon length gives pace; pace multiplied by length gives time. Our tool uses the standard fitness marathon distance so your splits match what a certified course measures.

Training notes

• Long-run pace is usually slower than marathon race pace; this tool does not replace a coaching plan.
• Hills, heat, and wind change effort at the same split—adjust expectations on hard courses.
• Negative splits and walk breaks change average pace but not the basic time = pace × distance relationship.

Sources & references