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Engine Horsepower Calculator

Calculate engine horsepower from trap speed or elapsed time.

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Tire Size Calculator

Decode tire sizes and calculate diameter and circumference.

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Bra Size Calculator

Calculate your bra size in US, UK, EU, French, Belgian, Spanish, Australian, and New Zealand formats.…

Fashion & Wearables

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Molecular Weight Calculator

Calculate molecular weight from a chemical formula.

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Resistor Calculator

Decode resistor color bands and calculate resistance values.

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Stair Calculator

Calculate riser height, tread count, and stringer length for staircases.

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Time Card Calculator

Calculate total hours worked from daily time entries.

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GDP Calculator

Calculate GDP using the expenditure approach C+I+G+NX.

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Mileage Calculator

Calculate mileage reimbursement using IRS standard rates.

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URL Encode Decode

Encode and decode URLs using percent encoding.

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Base64 Encode Decode

Encode and decode text to/from Base64 format.

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Time Duration Calculator

Calculate duration between two times.

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