Free Tools
Training Tools & Calculators
Fast, private tools that run entirely in your browser — nothing you type is uploaded. Pick one to get started.
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Sports Gadget Review is a research desk. This site does not run a product test fleet and does not invent reader counts. Publisher, not a merchant.
| Page | What it is |
|---|---|
| Sports Gadget Review | The Sports Gadget Review editorial desk |
| Reviews & Guides | Published buying guides already on the site |
| Best Smart Basketball 2026 | Already-published SIQ vs Wilson X guide |
| Best GPS Watches for Youth XC & Track | Already-published youth GPS watch guide |
| Best Adjustable Basketball Hoops | Already-published driveway hoop guide |
| Best Baseball Training Equipment | Already-published youth baseball gear guide |
| Wearables for Kids | Live kids fitness-tracker and GPS hub |
| Baseball Equipment Reviews | Live baseball training-gear hub |
| Training Tools & Calculators | Pace, race-time, and heart-rate tools |
| About the desk | Sports Gadget Review editorial desk |
| How We Make Money | Affiliate funding note from the editorial desk |
Running Pace Calculator
Solve pace, time, or distance — in min/km and min/mile.
Race Time PredictorEstimate another distance from one race, via the Riegel formula.
Heart Rate Zone CalculatorYour five training zones from age and resting heart rate.
GPS Watch Distance Error CalculatorCompare a known course to your watch reading — signed difference, percentage error, and optional pace.
Swim Pace CalculatorPool SCY/SCM/LCM pace per 100, lap splits, and interval send-offs.
Critical Swim Speed CalculatorCSS pace per 100 from 400 & 200 time trials, plus documented training zones.