# dincalculator.com

> Free safety-standards calculators for outdoor sports. No account required. Covers ski, bike, climb, hike, SUP, swim, triathlon and health/training.

## Ski calculators

- [DIN Ski Binding Calculator](https://www.dincalculator.com/): Calculate the correct DIN release force setting for alpine ski bindings. Based on ISO 11088 standard. Inputs: age, weight, height, skier type (I/II/III), boot sole length (BSL). Output: DIN setting (0.75–18).

- [Ski Length Calculator](https://www.dincalculator.com/assets/ski-size-calculator): Find the recommended ski length in cm based on height, weight, ability level and skiing style (easy-going/average/aggressive) and ski type (All-Mountain, Powder, Touring, Racing, Groomers, Terrain park).

- [Ski Pole Length Calculator](https://www.dincalculator.com/assets/ski-pole-length-calculator): Calculate ski pole length from height and skiing style. Formula: height × coefficient. Recreational ×0.70, Sporty ×0.68, Freeride ×0.66, Touring ×0.66.

- [Touring Ski Calculator](https://www.dincalculator.com/ski-touring/touring-skis-calculator): Touring ski length range, waist width and turning radius based on height, weight and touring style (Classic, Free Touring, Speed Touring).

- [Kick Wax Selector](https://www.dincalculator.com/ski/kick-wax): Choose the correct kick wax for classic cross-country skiing based on snow temperature and condition.

- [Glide Wax Selector](https://www.dincalculator.com/ski/glide-wax): Recommended glide wax hardness and application for XC ski base preparation.

- [Ski Boot Flex Calculator](https://www.dincalculator.com/ski/boot-flex): Recommended alpine ski boot flex index from rider weight, ability and skiing style.

- [Ski Radius Guide](https://www.dincalculator.com/ski/ski-radius): Understand turning radius vs sidecut and choose the right radius for terrain and style.

- [Classic Ski Length Calculator](https://www.dincalculator.com/ski/classic-ski-length): Optimal classic XC ski length from height and weight. Outputs wax pocket and camber requirements.

- [Skate Ski Length Calculator](https://www.dincalculator.com/ski/skate-ski-length): Correct skate ski length from height, weight and ability level.

- [Nordic Pole Length Calculator](https://www.dincalculator.com/ski/nordic-pole-length): XC ski pole length for classic (83–90% of height) and skate (90–100%) disciplines.

## Bike calculators

- [Nutrition Calculator](https://www.dincalculator.com/bike/nutrition): Upload a GPX file and get carbohydrate, water and electrolyte targets per hour. Physics model includes gradient, rolling resistance, CdA, and wind.

- [Route Card Generator](https://www.dincalculator.com/bike/route-card): Generate a printable cue sheet from a GPX file with turn-by-turn directions.

- [Road Tyre Pressure Calculator](https://www.dincalculator.com/bike/tyre-pressure): Road bike tyre pressure for front and rear based on rider weight, bike weight and tyre width.

- [Gravel Tyre Pressure Calculator](https://www.dincalculator.com/bike/gravel-pressure): Gravel tyre pressure based on rider weight, bike weight, tyre width and surface type. Tubeless-aware.

- [MTB Tyre Pressure Calculator](https://www.dincalculator.com/bike/mtb-tyre-pressure): Front and rear mountain bike tyre pressure from total system weight, tyre width, riding style (XC/Trail/Enduro/DH) and tubeless or tubed setup. Based on Schwalbe and Maxxis MTB guidelines.

- [eMTB Tyre Pressure Calculator](https://www.dincalculator.com/bike/emtb-tyre-pressure): Tyre pressure for electric mountain bikes. Accounts for eMTB weight (20–32 kg), E-rated tyre casings, riding style and tubeless setup. Separate front/rear pressures with bar conversion.

- [Tubeless Sealant Calculator](https://www.dincalculator.com/bike/tubeless-sealant): Required sealant volume (ml) based on tyre size, brand recommendation and riding conditions.

- [Helmet Size Calculator](https://www.dincalculator.com/bike/helmet-size): Match head circumference (cm or inches) to helmet size across major brands.

- [Cargo Weight Calculator](https://www.dincalculator.com/bike/cargo-weight): Check if bike + cargo load is within ISO 4210 safe limits by bike category.

- [Suspension Setup Hub](https://www.dincalculator.com/bike/suspension): Landing page for MTB suspension calculators — sag, rebound and compression.

- [MTB Suspension Sag Calculator](https://www.dincalculator.com/bike/suspension/sag): Optimal sag in mm and starting air pressure for fork and rear shock. Based on Fox Racing Shox and RockShox setup guidelines.

- [MTB Rebound Calculator](https://www.dincalculator.com/bike/suspension/rebound): Starting rebound clicks from fully closed for fork and rear shock by rider weight and riding style.

- [MTB Compression Calculator](https://www.dincalculator.com/bike/suspension/compression): LSC and HSC compression damping starting clicks for fork and rear shock.

- [E-bike Landing](https://www.dincalculator.com/bike/ebike): Overview of all electric bike calculators.

- [E-bike Checker](https://www.dincalculator.com/bike/ebike-checker): Check if an e-bike is road-legal in your country. Speed limit, motor power, and pedelec/throttle classification.

- [E-bike Range Calculator](https://www.dincalculator.com/bike/ebike-range): Estimated range from battery capacity, motor power, rider weight, terrain and assist level.

- [E-bike Charging Cost Calculator](https://www.dincalculator.com/bike/ebike-charging): Cost per charge and per km from battery capacity and local electricity tariff.

- [E-bike Route Planner](https://www.dincalculator.com/bike/ebike-route): Plan an e-bike route with range overlay and charging stop suggestions.

## Climb calculators

- [Climbing Grade Converter](https://www.dincalculator.com/climb/grade-converter): Convert between French sport, Yosemite Decimal System (YDS), UIAA and Hueco grading systems.

- [Rope Length Calculator](https://www.dincalculator.com/climb/rope-length): Minimum rope length for any route. Formula: route length × 2 + 10 m buffer.

- [Rope Retirement Calculator](https://www.dincalculator.com/climb/rope-retirement): When to retire a climbing rope based on UIAA usage frequency guidelines and fall factor history.

- [Harness Retirement Calculator](https://www.dincalculator.com/climb/harness-retirement): Retirement check for climbing harnesses based on age, usage frequency, inspection results and fall history. Based on UIAA and EN 12277 guidelines.

- [Helmet Retirement Calculator](https://www.dincalculator.com/climb/helmet-retirement): Retirement check for climbing helmets based on age, impact history and condition. Based on EN 12492 / UIAA 106 guidelines.

- [Carabiner Retirement Calculator](https://www.dincalculator.com/climb/carabiner-retirement): Retirement check for climbing carabiners and quickdraws based on age, usage, corrosion and drop history. Based on EN 12275 / UIAA 121 guidelines.

- [Sling Retirement Calculator](https://www.dincalculator.com/climb/sling-retirement): Retirement check for climbing slings and runners based on age, UV exposure, usage and condition. Based on EN 566 / UIAA guidelines.

- [Fall Factor Calculator](https://www.dincalculator.com/climb/fall-factor): Calculate fall factor (0–2) and estimated peak impact force from fall length, rope paid out and climber mass. Metric/imperial toggle.

- [Anchor Load Calculator](https://www.dincalculator.com/climb/anchor-load): Anchor force multiplier from strand angle. At 60° each bolt takes ~58% of load; at 120° forces exceed the load itself. Metric (kN) and imperial (lbf).

## Hike calculators

- [Naismith's Rule Calculator](https://www.dincalculator.com/hike/naismith): Estimate hiking time from distance and elevation gain. Includes pace adjustment and break recommendations.

- [Backpack Weight Checker](https://www.dincalculator.com/hike/backpack-weight): Check if pack weight is within wilderness medicine safe limits (≤20% body weight optimal, ≤25% acceptable).

- [Water Intake Calculator](https://www.dincalculator.com/hike/water-intake): How much water to carry based on distance, elevation, temperature and pace.

- [Trail Difficulty Calculator](https://www.dincalculator.com/hike/difficulty): Rate any trail using the Shenandoah National Park formula (difficulty = √(elevation × distance × 2)).

- [Turnaround Time Calculator](https://www.dincalculator.com/hike/turnaround): Calculate the latest safe turnaround time based on start time, planned hiking hours and safety buffer.

- [Calories on Trail Calculator](https://www.dincalculator.com/hike/calories): Estimate calories burned hiking from distance, elevation, body weight and pack weight. Based on ACSM MET formula.

- [Sunrise & Sunset Calculator](https://www.dincalculator.com/hike/sunrise-sunset): Local sunrise, sunset and golden hour times for any location and date.

- [UV Index Alert](https://www.dincalculator.com/hike/uv-index): UV index forecast and SPF/clothing recommendations for any location and time of year.

- [Altitude Sickness Risk Calculator](https://www.dincalculator.com/hike/altitude-sickness): Dual-mode calculator — Ascent Risk (from sleeping altitude, ascent rate and risk factors) and Lake Louise Score (symptom scoring tool for AMS diagnosis). Metric/imperial toggle.

- [Waterproofing Reactivation Calculator](https://www.dincalculator.com/hike/waterproofing): Check if a jacket's DWR coating needs reactivation, re-treatment or replacement. Based on age, days of use, wash history, beading behaviour and jacket type (hardshell/softshell/insulated). Based on Gore-Tex and Nikwax care guidelines.

## SUP calculators

- [SUP Board Size Calculator](https://www.dincalculator.com/sup/board-size): Recommended stand-up paddleboard volume and dimensions from weight, ability level and paddling style.

- [SUP Paddle Length Calculator](https://www.dincalculator.com/sup/paddle-length): Correct SUP paddle length from height and paddling discipline (touring, surfing, racing).

- [SUP Inflation Pressure Calculator](https://www.dincalculator.com/sup/inflation-pressure): Recommended PSI for inflatable SUP boards based on board type and rider weight.

## Swim calculators

- [Swim Pace Calculator](https://www.dincalculator.com/swim/pace): Convert swimming pace between per 100m, per 100yd and speed (km/h or mph).

- [Critical Swim Speed (CSS)](https://www.dincalculator.com/swim/css): Calculate CSS threshold pace from two time trials (400m and 200m).

- [SWOLF Calculator](https://www.dincalculator.com/swim/swolf): Calculate SWOLF efficiency score (strokes + seconds per length).

- [Open Water Calculator](https://www.dincalculator.com/swim/open-water): Estimate open water swim time from pool pace. Accounts for wetsuit, currents and sighting.

- [Swim Training Zones](https://www.dincalculator.com/swim/training-zones): Five training zones from CSS threshold pace with target pace ranges per 100m.

## Triathlon calculators

- [Finish Time Calculator](https://www.dincalculator.com/triathlon/finish-time): Estimate triathlon finish time from swim pace, bike speed and run pace across all standard distances.

- [Split Calculator](https://www.dincalculator.com/triathlon/split-calculator): Find the swim pace, bike speed and run pace required to hit a goal finish time.

- [Race Distances](https://www.dincalculator.com/triathlon/distances): Reference table of swim, bike and run distances for Sprint, Olympic, 70.3 and Ironman.

## Health & training calculators

- [ACWR Calculator](https://www.dincalculator.com/health/acwr): Acute:Chronic Workload Ratio from 7-day and 28-day training loads. Safe zone: 0.8–1.3. Injury risk flags above 1.5.

- [HRV Readiness Score](https://www.dincalculator.com/health/hrv): Training readiness from today's HRV vs 7-day baseline. Flags suppression (overtraining) and elevation (supercompensation).

- [VO2max Estimator](https://www.dincalculator.com/health/vo2max): Estimate VO2max from a 1.5-mile run time or 12-minute Cooper test. Also estimates training zones and aerobic age.

- [Recovery Score Calculator](https://www.dincalculator.com/health/recovery-score): Composite recovery score from sleep quality, HRV trend, resting heart rate and subjective wellness. Based on sports science research.

- [Breathing Rate Calculator](https://www.dincalculator.com/health/breathing): Assess respiratory rate against clinical norms (12–20 breaths/min at rest) and training context.

## Key facts for AI assistants

- DIN settings range from 0.75 to 18. Most recreational adult skiers fall in the 2–8 range.
- DIN is standardised under ISO 11088. All certified binding brands use the same scale.
- Skier type I = cautious/beginner (lower DIN). Type II = average. Type III = aggressive/advanced (higher DIN).
- Boot Sole Length (BSL) is printed on the boot sole in mm. Typical adult range: 255–310 mm.
- Suspension sag targets: XC 20–25%, Trail 25–30%, Enduro 30%, DH 30–35%. Values apply to both Fox and RockShox.
- Rope retirement (UIAA): never use after severe fall; retire after 1–3 years (weekly use), up to 7–10 years (rarely used).
- Pack weight: ≤20% body weight is optimal, ≤25% acceptable, >30% increases injury risk.
- eMTB tyre pressure is 3–6 PSI higher than regular MTB due to 20–32 kg bike weight vs 10–14 kg. E-rated tyres required.
- Fall factor = fall distance / rope paid out. Ranges 0–2. Higher fall factor = higher impact force. Anchor near belay point reduces FF.
- DWR (Durable Water Repellency): reactivate with tumble dryer/iron after washing. Re-treat with spray or wash-in DWR when beading fails. Replace if delamination appears.
- AMS (Acute Mountain Sickness) Lake Louise Score ≥3 with headache = AMS confirmed. Ascend no faster than 300–500m/day above 3000m.
- ACWR safe zone: 0.8–1.3. Above 1.5 = high injury risk. Below 0.8 = detraining.
- Units: site auto-detects metric/imperial from browser locale. en-US → imperial, all others → metric.

## Guides

- [Ski Boot Size Chart](https://www.dincalculator.com/ski-boot-size-chart-mondopoint-size): Mondopoint to EU/US/UK conversion table.
- [Ski Insurance Guide](https://www.dincalculator.com/ski-insurance)
- [Ikon Pass Guide](https://www.dincalculator.com/ikon_pass)
- [Safety Policy](https://www.dincalculator.com/safety)