Converters

Learn how currency exchange rates work, what the mid-market rate is, and how to use a free currency converter to get better rates on remittances, travel money, and international payments.

The rate Google shows for USD/EUR is not the rate you'll get from your bank. Here's how the mid-market rate works, what the bid-ask spread costs you, and why the gap between the two can be 3–5% at a bank or 10%+ at an airport kiosk.

The exchange rate on news sites is the interbank rate — traded in million-dollar volumes between major banks. A traveller at an airport or a small business buying forward both pay derivatives of this rate, with markup layers that range from 0.1-0.2% at specialist brokers to 3-7% at airport bureaux de change. Here's the full markup chain from interbank to airport rates, why the spread exists, and how forward rates are calculated (not predicted) from interest rate differentials.

Acres, hectares, mu, tsubo, and rai all measure land — but each unit reflects different agricultural histories and property cultures. Here's what each unit means in practical context, where they're used globally, and a complete conversion reference for international property and agricultural research.

Learn how weight units from milligrams to maunds relate to each other — including troy ounces, tolas, and stones — with real examples for gold, cooking, shipping, and body weight.

The hectare was deliberately designed as a human-scale agricultural unit (100m × 100m = 10,000 m²), sitting between the too-small square metre and too-large square kilometre for farm use. Here's why carbon sequestration and deforestation rates are expressed in hectares, why US bushel-per-acre and international tonne-per-hectare crop yield data require crop-specific conversion factors, and why urban density comparisons break down when cities use different area boundary definitions.

Fan oven vs conventional oven differs by 20°C of cooking power — a recipe at 200°C conventional should be 180°C in a fan oven. Here's the complete Celsius/Fahrenheit/Gas Mark conversion table, why domestic ovens typically run 10-25°C off from their dial, the Maillard reaction temperature thresholds that explain why cooking temperature matters beyond "cooked through," and why 350°F became America's default baking temperature.

Nanoseconds define CPU cache speeds; milliseconds define user experience; microseconds determine whether distributed database clocks can be trusted. Here's the computing time hierarchy, NTP clock synchronisation, why leap seconds cause outages, and what P99 latency means.

A 500 MW wind farm doesn't deliver 500 MW continuously — its 40% capacity factor means average output closer to 200 MW. Here's how capacity factors compare across energy sources, what "homes powered" claims actually mean, how grids balance intermittent renewables, and solar panel output calculations.

At 10 metres underwater, pressure doubles. Every additional 10 metres adds another atmosphere. Here's Boyle's Law and why air spaces squeeze on descent, nitrogen narcosis and partial pressures, decompression sickness mechanics, and what NDL limits mean for recreational divers.