noughts CALCULATOR
Tap a field, then type or use the keys. Editing: Stake
Return includes your stake. Implied chance is derived from the price, not a prediction. No commission or deductions. Amounts use the currency of your stake.
How these calculations work
Decimal odds include the returned stake. Profit = stake × (decimal odds − 1). Implied probability = 100 ÷ decimal odds. Fair decimal odds = 1 ÷ probability as a fraction. Accumulator decimal prices multiply together. Each-way is two equal stakes, with reduced profit odds for the place part. Margin uses the sum of the implied probabilities minus 100%.
This calculator covers singles, win accumulators, single each-way bets, isolated lays, probability and complete-market overround. It does not settle system bets, each-way accumulators, dead heats, free bets or bookmaker deductions.
Formula references: Odds & probability · Each-way · Market margin.
Roll the knurled end or swipe to choose · tap arrows to step
Tap an input, then type or use the keys below.
Convert between the labelled units in either direction. Results display up to 12 significant figures.
Units & definitions
International mile = 1,609.344 m; inch = 25.4 mm; pound = 0.45359237 kg. UK gallon = 4.54609 L; US liquid gallon = 3.785411784 L. Temperature uses scale offsets. Fuel consumption uses a reciprocal calculation. Months and years are not treated as fixed durations.
Standard conversion factors: NIST Guide to the SI. Calculations use floating-point arithmetic and rounded display values.
No rate loaded
Rates from Frankfurter, using daily central-bank and official-source reference data. These are indicative rates, not live quotes; banks and exchange services may apply different rates and fees. Dates may differ by currency. Saved rates are labelled if a refresh fails.
Rate slider: 0 to 100 percent. The first half covers 0 to 25 percent for finer control. UK VAT starts at 20%. Your chosen rates are remembered. Net excludes tax; gross includes tax. Minus removes tax already included.
Split the bill People + tip
Enter the bill including any tax. Tip is calculated on that total; no extra tax is added.
Amounts stay in the currency of your bill. People and tip settings are remembered.
Calculation history
Your last 20 calculations appear here. Saved in this browser.
Five ways to work things out.
Handy keeps everyday arithmetic close at hand. Scientific adds powers, roots, trigonometry, logarithms and factorials. Bases converts whole numbers between binary, octal, decimal and hexadecimal. Odds includes returns, probability, each-way, accumulators, bookmaker margin and lay calculations. Enter fractional, decimal or American odds, or work from probabilities and outcome counts. Tap a field and use the keypad or type directly. Convert covers metric and imperial length, area, volume, weight, speed, temperature, energy, power, pressure, time, digital storage and fuel economy, plus power-and-time energy calculations. Switch from Units to Currency for 21 major currencies using dated daily reference rates.
Use × for multiplication and brackets to group a calculation. Powers are evaluated before a leading minus: −2² = −4; (−2)² = 4. Percent divides a value by 100, so 200 × 10% = 20. Scientific calculations use standard floating-point arithmetic; displayed answers are rounded to 12 significant figures.
Use + VAT to add tax and − VAT to extract included tax. UK VAT starts at 20%; the thin rate slider adjusts from 0 to 100%. For example, 100 + VAT = 120, and 120 − VAT = 100. Select Sales tax for a rate of your own. Your rates are remembered, and Net, Tax and Gross appear inside the LCD after a tax calculation. The bill splitter adds your chosen tip to the bill total, then divides it fairly, showing any penny adjustments.
Switch between Calculator and Walnut & brass whenever you like. Your calculation stays in place. History and appearance are saved locally; memory lasts for this visit.
Fancy a puzzle? Play Noughts Base10 Meet the number bases