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Outdoors & Recreation Tools
920 free calculators, converters and checkers — built for SG, MY and the region, reviewed with current figures. No accounts, no paywalls.
Rode length to let out for safe anchoring
Wind components from runway heading
Density altitude with humidity, from QNH in hPa or inHg
How muggy will it feel? Dew point from temperature and humidity
Calories burned hiking — with pack weight, grade and terrain
Flash-to-bang distance in km, for the air you are in
Estimate walking time over distance + ascent
Sunrise, sunset, golden hour and day length for anywhere
TAS from CAS, altitude and temperature
The heat number outdoor work and sport rules are actually written against — and an honest refusal when it cannot be estimated.
Feels-like temperature, hot or cold