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THE SUMFIZZ LIBRARY

Sport and recreation calculators

Explore 25 free tools for sport and recreation. Find running pace, race finish time, race split planner and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.

THE SUMFIZZ LIBRARY

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25 calculators

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Running pace

Pace is time per distance, while speed is distance per time.

Sport and recreation

Race finish time

Assumes the same pace over the full distance; stops are excluded.

Sport and recreation

Race split planner

Even-pace splits, including a final partial split.

Sport and recreation

Negative-split planner

The entered difference is between the two half times, not an addition to each half.

Sport and recreation

Race time prediction

Riegel-style empirical extrapolation.

Sport and recreation

Track lap count

Track distance depends on lane and measured course; use the actual lap length.

Sport and recreation

Treadmill pace

Uses stated belt speed without calibration or incline adjustment.

Sport and recreation

Treadmill incline gain

Grade is rise divided by horizontal run; belt distance is along the slope.

Sport and recreation

Cycling cadence and speed

Assumes no tyre slip and continuous pedalling at the stated cadence.

Sport and recreation

Bicycle gear inches

Gear inches describe mechanical gearing, not hill-climbing ability by themselves.

Sport and recreation

Cycling power-to-weight

State whether the denominator includes the bicycle and equipment when comparing results.

Sport and recreation

Cycling climbing work

Only gravitational work; aerodynamic, rolling and drivetrain losses are excluded.

Sport and recreation

Swimming pace

Rest time is included if it is part of the entered elapsed time.

Sport and recreation

Swimming lap planner

One length goes from one end to the other; a return lap is two lengths.

Sport and recreation

Rowing split and power

Uses the Concept2-style pace-power equation.

Sport and recreation

Triathlon finish planner

Adds entered discipline and transition durations without predicting pace.

Sport and recreation

Interval workout duration

Rest is placed between repetitions only, with no final rest appended.

Sport and recreation

Training volume

External load volume is an arithmetic training log, not a measure of physiological effect.

Sport and recreation

Plate loading

Uses the listed plate pairs, each at most once.

Sport and recreation

One-rep-max estimate

Epley estimate, with a single repetition returned unchanged.

Sport and recreation

Training load trend

Sum duration × self-reported effort.

Sport and recreation

Round-robin fixtures

Round count assumes enough venues and no rest restrictions.

Sport and recreation

Knockout bracket

Single elimination without a third-place match.

Sport and recreation

League points scenarios

Assumes losses award zero points and no deductions or bonus points.

Sport and recreation

Tournament court scheduling

Capacity-only estimate without player conflicts, rest rules or bracket dependencies.

Sport and recreation