Công cụ khoa học Trái Đất

Máy tính địa chất, địa chấn và hệ thống Trái Đất.

Free earth science calculators for students, educators, and anyone curious about our planet. Convert between earthquake magnitude scales, estimate seismic energy and TNT equivalents, and explore geology and environmental tools — all using standard seismological relationships. Every calculator runs instantly in your browser with clear steps and no signup.

Popular Công cụ khoa học Trái Đất

Altitude Pressure Calculator

Convert between altitude and atmospheric pressure using the barometric formula or ISA standard atmosphere. Pressure in hPa, inHg, kPa, and more. Free, browser-based.

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Công cụ khoa học Trái Đất

Rock Density Calculator

Calculate rock bulk density from mass and volume, rectangular blocks, or drill cores. Porosity from grain density. Compare to typical granite, basalt, limestone, and more. Free, browser-based.

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Công cụ khoa học Trái Đất

Humidity Calculator

Calculate relative humidity, dew point, wet-bulb temperature, vapor pressure, absolute humidity, and mixing ratio from dry-bulb readings. Free, browser-based.

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Công cụ khoa học Trái Đất

Steel Weight Calculator

Calculate steel weight for round bar, rebar, square bar, flat bar, plate, and pipe. Enter dimensions and quantity — get total kg or lb, weight per meter, and volume. Carbon steel density 7850 kg/m³. Metric and imperial units. Free, browser-based.

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Công cụ khoa học Trái Đất

Air Density Calculator

Calculate air density from temperature, pressure, and humidity, or from altitude. Shows kg/m³, virtual temperature, speed of sound, and comparison to sea-level standard. Free, browser-based.

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Công cụ khoa học Trái Đất

Earthquake Magnitude Converter

Convert between earthquake magnitude scales — Mw, Ms, ML (Richter), mb, and Md. Estimates seismic moment, energy in joules, and TNT equivalent. Free, browser-based.

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Công cụ khoa học Trái Đất

Rainfall Calculator

Calculate rainfall volume from catchment area and depth, estimate storm runoff with a runoff coefficient, or compute rainfall intensity (mm/hr). Metric and imperial units. Free, instant, browser-based.

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Công cụ khoa học Trái Đất

Water Flow Calculator

Calculate volumetric flow rate Q = A × v for pipes and open channels, estimate flow with Manning's equation, or convert between L/s, GPM, CFS, and m³/s. Metric and imperial units. Free, instant, browser-based.

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Công cụ khoa học Trái Đất

River Discharge Calculator

Calculate river discharge Q from channel width, depth, and mean velocity (velocity–area method), trapezoidal cross-sections with bank slope, or Manning's equation. Results in m³/s, L/s, and CFS with river size classification. Free, browser-based.

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Công cụ khoa học Trái Đất

Bearing Capacity Calculator

Calculate ultimate and allowable soil bearing capacity using Terzaghi's equation for strip, square, and circular footings. Enter cohesion, friction angle φ, unit weight, depth, and footing width. Compare applied pressure to q_allow. Metric and imperial units. Free, browser-based.

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Công cụ khoa học Trái Đất

Pump Power Calculator

Calculate pump hydraulic power, shaft power, and motor sizing from flow rate and head. Modes: hydraulic power (ρgQH), brake power with pump efficiency, motor input with motor efficiency, and power from pressure rise. Results in kW, hp, and W. Water and custom specific gravity. Metric and imperial units. Free, browser-based.

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Công cụ khoa học Trái Đất

Concrete Mix Calculator

Calculate cement, sand, aggregate, and water quantities for concrete mixes. Design by volume, cement bags, or grade presets (M10–M25). Enter mix ratio 1:S:A and water–cement ratio. Metric (m³, kg) and imperial (yd³, lb) units. Free, browser-based.

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