Sportprestaties Rekenmachines

Estimate aerobic capacity from race time. Based on WHO and clinical guidelines. Instant result with healthy range chart and interpretation.

US Army body fat percentage method. Based on WHO and clinical guidelines. Instant result with healthy range chart and interpretation.

Calculate pace needed to finish a 5K in your target time. Enter goal time — see required pace per km and per mile with splits. Free.

Predict marathon time from shorter race results. Based on sports science. Instant result with training zone chart and performance guide.

Pace and finish time for a half marathon. Based on sports science. Instant result with training zone chart and performance guide.

Estimated cycling power output in watts. Based on sports science. Instant result with training zone chart and performance guide.

Calculate swimming pace per 100m or 100 yards. Enter total time and distance — see pace per 100m/y and equivalent open water pace. Free.

Post-exercise HRR fitness level indicator. Based on WHO and clinical guidelines. Instant result with healthy range chart and interpretation.

Weekly training stress and recovery balance. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Rowing pace split time and wattage. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Estimate hiking time by distance and elevation gain. Enter km and metres of ascent — see time using Naismith's Rule. Free.

Calculate sport nutrition for dietary planning. Enter food items or amounts — see nutritional breakdown with recommended daily values. Free.

Calculate pace, finish time, or distance for any run. Enter two of three values — see the third with kilometre and mile splits. Free.

Convert step count to miles and kilometres. Enter your steps and stride length — see distance, calories burned, and active time. Free.

One-rep max from any weight and reps. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Calculate pace and split times for marathon distance (42.195km). Enter goal time — see pace per km/mile with every 5km split. Free.

Calculate pace for half marathon (21.1km). Enter goal time — see required pace with 5km and mile split targets. Free.

Calculate swimming pace per 100m or 100 yards. Enter distance and time — see pace, CSS threshold, and training zone guidance. Free.

Calculate calories burned walking per mile or km. Enter body weight and distance — see calories with pace and terrain adjustments. Free.

Maximum heart rate by age and fitness level. Based on WHO and clinical guidelines. Instant result with healthy range chart and interpretation.

Calculate power-to-weight ratio for cycling or running. Enter FTP or power output and bodyweight — see W/kg and performance category. Free.

Interpret your HRV reading against age-based norms and training readiness. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Calculate the Acute:Chronic Workload Ratio (ACWR) for injury risk. Enter recent and baseline training loads — see risk zone and guidance. Free.

Predict triathlon finish time from individual discipline paces. Enter swim, bike, and run times — see total prediction with transition. Free.

Convert between French, YDS, UIAA, and V-scale climbing grades. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Predict 2000m ergometer time from training splits and body weight. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Calculate Wilks score for comparing powerlifting performance across bodyweights. Enter total lifted and bodyweight — see score and ranking. Free.

Look up beginner to elite strength standards by lift, weight, and sex. Enter your value and unit — see the converted result with formula and equivalents. Free.

Analyse tennis serve speed, spin rate, and break-even performance metrics. Enter your figures — see the result with formula and year-by-year breakdown. Free.

Adjust golf carry distance for altitude, temperature, and wind conditions. Enter your values — see the result with formula, examples, and step-by-step working. Free.

Calculate archery round scores and classification level from end averages. Formula, variable legend, diagram and worked example included. Instant geometry result.

Calculate athletic or engine performance at altitude. Enter elevation — see air density, oxygen partial pressure, and performance adjustment. Free.

Calculate weekly swim training volume and progression rate targets. Formula, variable legend, diagram and worked example included. Instant geometry result.

Optimise nutrient timing around training. Enter workout time and type — see pre, during, and post-workout nutrition recommendations. Free.

Assess the safety of a combat sports weight cut and rehydration plan. Enter your values — see the result with formula, examples, and step-by-step working. Free.