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15 categories. Scientific calculator. Exact conversion factors from NIST — not rounded guesses.

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Quick conversions

1 mile = 1.609 km1 lb = 0.454 kg32°F = 0°C1 gal = 3.785 L🔧 SAE ↔ Metric

Conversion Categories

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📏Length8 units⚖️Weight6 units🌡️Temperature3 units📐Area6 units🧪Volume6 units🚀Speed4 units⏱️Time7 units💾Data5 units🍳Cooking8 units🏃Pace5 units⚡Energy8 units🔌Power6 units📜Historical Units9 units⚱️Historical Mass6 units🗺️Historical Area5 units

Popular Conversions

Most searched conversion pages

Cups to Grams Converter
Convert cups to grams (ml-equivalent) for baking and cooking. Quick reference table for flour, sugar, butter and more.
Tablespoons to Milliliters Converter (tbsp to ml)
Convert tablespoons (tbsp) to milliliters (ml) instantly. Includes US tablespoon = 14.7868 ml conversion table.
Teaspoons to Milliliters Converter (tsp to ml)
Convert teaspoons to milliliters (1 tsp = 4.92892 ml). Perfect for recipes and medication doses.
Cups to Milliliters Converter (cup to ml)
1 US cup = 236.588 ml. Convert between cups and milliliters with our quick reference table.
Min/km to Km/h Converter
Convert your running pace from minutes per kilometer to kilometers per hour. Plan races and training instantly.
Min/Mile to Km/h Converter
Convert minutes per mile to kilometers per hour for runners. Quick pace calculator with reference table.
Min/km to Min/Mile Pace Converter
Convert running pace between min/km and min/mile. Essential tool for runners training across metric and imperial units.
Calories to Joules Converter (cal to J)
1 calorie = 4.184 joules. Convert between calories and joules for nutrition, physics and chemistry calculations.
Kcal to Kj Converter
Convert kilocalories (kcal) to kilojoules (kJ) for food labels and nutrition. 1 kcal = 4.184 kJ.
kW to HP Converter
Convert kilowatts (kW) to mechanical horsepower (HP). 1 kW ≈ 1.341 HP. Used for car engines and motors.
HP to kW Converter
Convert horsepower (HP) to kilowatts (kW). 1 HP ≈ 0.7457 kW. Standard for engine power conversions.
Pood to Kg Converter
1 pood ≈ 16.38 kg. Convert the historical Russian mass unit pood to kilograms. Approximate value for historical contexts.
Verst to Kilometers Converter
1 verst ≈ 1.0668 km. Convert the historical Russian length unit verst to kilometers.
Cubit to Centimeters Converter
1 cubit ≈ 45.72 cm. Convert the ancient cubit (forearm length) to centimeters. Approximate historical value.
Desyatina to Hectares Converter
1 desyatina ≈ 1.0925 hectares. Convert historical Russian land area to hectares.
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Scientific Calculator

Trigonometric, logarithmic, exponential functions and more — all in your browser.

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Why ConvertProf?

Most online converters either round silently or bury results in ads. ConvertProf uses exact, sourced factors — verified against NIST and the 1959 international yard and pound agreement.

Exact factors

No rounding tricks. 1 inch = 2.54 cm exactly. 1 lb = 0.45359237 kg.

Instant & offline

All math runs in your browser. No server calls, no data leaves your device.

Context included

Every category explains the formula, history and real-world use cases.

15 categories

From everyday units to historical Russian pood, verst and desyatina.

About this project

ConvertProf started as a personal cheat-sheet for converting US baking recipes to a European kitchen scale. It grew into a public tool when we realised most "top of search" converters quietly use rounded factors — fine for casual use, but unacceptable when filing customs paperwork, registering a car, or measuring medication doses.

We follow simple editorial rules: every formula is sourced, every category page is reviewed before publication, and any reader-reported error is fixed within 48 business hours. Read more on our About page or browse the long-form articles in our blog.

Found a unit we missed or a result that looks wrong? Email hello@convertprof.com or use the Contact form.