Earth and Weather Calculators

Earth & Weather Calculators

Use free online Earth and weather calculators to estimate geographic distances, antipodes, azimuth, earthquake magnitude, rainfall volume, snow depth, sun exposure and wind chill.

🌐 Antipode Calculator 🧭 Azimuth Calculator 🌎 Earthquake Calculator 📍 Latitude Longitude Distance 🌧️ Rainfall Calculator ❄️ Rain to Snow Calculator ☀️ Sunbathing Calculator 💨 Wind Chill Calculator

1. Antipode Calculator

Find the point on Earth directly opposite your location.

Latitude (−90 to 90°) Longitude (−180 to 180°)

2. Azimuth Calculator

Calculate the initial compass bearing from one geographic coordinate to another.

Starting latitude (°) Starting longitude (°) Destination latitude (°) Destination longitude (°)

3. Earthquake Calculator

Estimate the energy released by an earthquake using moment magnitude, or calculate the approximate magnitude from energy.

Calculation mode Magnitude → EnergyEnergy → Magnitude Magnitude (Mw) Energy (joules)

Energy is an approximate empirical estimate. Magnitude alone does not determine local shaking or damage.

4. Latitude Longitude Distance Calculator

Calculate the great-circle distance between two points on Earth using the Haversine formula.

Latitude 1 (°) Longitude 1 (°) Latitude 2 (°) Longitude 2 (°)

5. Rainfall Calculator

Estimate the volume of rain collected over a surface area.

Surface area Area unit Square metres (m²)Square feet (ft²)Hectares (ha)Square kilometres (km²)Acres Rainfall depth Rainfall unit Millimetres (mm)Centimetres (cm)Inches (in)

6. Rain to Snow Calculator

Estimate equivalent snow depth from liquid precipitation using a selected snow-to-liquid ratio.

Rain or liquid equivalent Input unit Millimetres (mm)Centimetres (cm)Inches (in) Snow-to-liquid ratio 5:1 — Wet, heavy snow10:1 — Common estimate15:1 — Typical dry snow20:1 — Light, powdery snowCustom ratio Custom ratio (snow : liquid)

Actual snow accumulation varies with temperature, wind, compaction and snow density.

7. Sunbathing Calculator

Estimate a theoretical sunscreen reapplication interval using UV index, SPF and a user-selected skin sensitivity factor. This is not a safe-sun-exposure guarantee.

UV index (0–20) Sunscreen SPF Skin sensitivity factor (minutes) Very sensitive — 5Sensitive — 10Medium — 15Less sensitive — 20

Do not use this result to decide how long to sunbathe. UV damage can occur before sunburn, and no sunscreen blocks all UV radiation. Seek shade, wear protective clothing and reapply sunscreen at least every two hours and after swimming or sweating, following the product label.

8. Wind Chill Calculator

Estimate how cold the air feels on exposed skin using temperature and wind speed. The standard formula applies in cold, windy conditions.

Air temperature Temperature unit Celsius (°C)Fahrenheit (°F) Wind speed Wind speed unit Kilometres/hour (km/h)Miles/hour (mph)Metres/second (m/s)Knots

The standard wind-chill equation is intended for air temperatures at or below 10°C (50°F) and wind speeds above about 4.8 km/h (3 mph).

About Earth & Weather Calculators

These free online tools provide estimates for geography, rainfall, snowfall, earthquake energy, sun exposure and cold-weather conditions. Results depend on the accuracy of your inputs and the assumptions stated for each calculator.

For navigation, use verified maps and location data. For weather alerts, earthquake warnings and health or safety decisions, consult the appropriate official authorities.