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Timezone Converter
Convert dated local times between IANA zones while handling daylight saving transitions.
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Tip Calculator
Quickly split a bill with a percentage tip. See the tip amount, total, and per-person amount.
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TOML to JSON Converter
Convert TOML tables, arrays, and values into formatted JSON.
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TOML to YAML Converter
Convert TOML tables, arrays and values into YAML 1.2. Keep exact integers and review how dates are represented.
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Torque Calculator
Torque magnitude = lever arm × force × sin(angle).
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Torque Converter
Convert a quantity using the listed fixed unit factors.
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Torus Surface Area Calculator
Find ring torus area as 4π²Rr.
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Torus Volume Calculator
Find ring torus volume as 2π²Rr².
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Transformer Turns Ratio Calculator
Find ideal transformer secondary voltage from the turns ratio.
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Trapezoid Area Calculator
Trapezoid area = (parallel side a + parallel side b) × height / 2.
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Trapezoid Midsegment Calculator
Find the trapezoid midsegment as the average of the parallel base lengths.
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Triangle Angle Calculator
Find the third interior angle of a plane triangle.
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Triangle Area Calculator
Triangle area = base × perpendicular height / 2.
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Triangle Centroid Calculator
Find the centroid coordinates of three triangle vertices.
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Triangle Circumradius Calculator
Find triangle circumradius R = abc / (4 × area).
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Triangle Height Calculator
Find the perpendicular triangle height as twice area divided by base.
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Triangle Inequality Checker
Check whether three positive side lengths form a nondegenerate triangle.
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Triangle Inradius Calculator
Find triangle inradius r = area / semiperimeter.
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Triangle Perimeter Calculator
Find the perimeter of a valid nondegenerate triangle.
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Triangle Side Calculator
Find the opposite side with the cosine rule.
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