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MethodologyVisible assumptions
Calculator shelf

Sports & Hobby Calculators

Use jump-airtime, pace, split, and sizing tools that show the formulas and explain the assumptions before you act on the result.

Updated 2026-07-22Jump airtime and running paceVisible assumptions
See methodology

Availability

Use listed tools as planning aids and read each page's formula, example, assumptions, and limits.

Start here paths

Choose the sports or hobby decision

Start with the question you are trying to answer, then open the calculator that matches the distance, split, or sizing decision.

Plan race pace

Turn a 5K, 10K, half marathon, marathon, or custom distance into pace per mile, pace per kilometer, and a same-pace finish estimate.

Interactive calculator.

Choose ski length

Estimate a starting range from height, weight, style, and flex need before comparing a manufacturer chart.

Planning aid.

Estimate jump airtime or height

Convert measured airtime into vertical rise and takeoff speed, or start with vertical speed to estimate airtime.

Interactive calculator.

Running calculators

Use pace math to compare finish goals, race results, and split plans.

Interactive calculatorFormula shown

Run Race Pace Calculator

Calculate pace per mile, pace per kilometer, average speed, and same-pace finish time from a race distance and finish time.

Interactive calculator · Updated 2026-07-08

Jump airtime

Use same-height projectile motion to relate total airtime, vertical rise, and takeoff speed.

Interactive calculatorFormula shown

Hang Time Calculator

Convert measured airtime into estimated vertical rise and takeoff speed, or calculate airtime from vertical speed.

Interactive calculator · Updated 2026-07-22

Ski sizing

Estimate ski length from height, weight, style, and flex needs before comparing a manufacturer chart.

Planning aidFormula shown

Cross Country Ski Size Calculator

Estimate classic, skate, or backcountry ski length from height, weight, style, and flex preference.

Planning aid · Updated 2026-06-24

Methodology notes

  • Jump airtime uses constant-gravity vertical motion and requires matching takeoff and landing height for the symmetric result.
  • Running pace uses time divided by distance and shows both mile and kilometer pace.
  • Sports sizing tools are starting points; manufacturer charts, race conditions, terrain, and personal fit can override a general result.
  • Each tool includes examples, limits, and source notes so you can compare the result with event conditions and manufacturer guidance.