Free ToolsRule of 72: Estimate Doubling Time Fast
Rule of 72 explained: how to estimate how long an investment takes to double, worked examples, how accurate it is, and the practical ways to use it.
Bullynx Editorial Team · Jul 7, 2026 · 5 min read
Topic · 8 guides
Free Tools articles
Guides to the free calculators on Bullynx: risk-reward, position size, stock averaging, pip value, and how to fold them into a repeatable pre-trade checklist.
Free Tools
Free ToolsBreakeven Price: Formula, Fees and Averaging Down
How to calculate the breakeven price on a trade: the formula with fees included, how averaging down moves it, and how it works on a short position.
Bullynx Editorial Team · Jul 1, 2026 · 7 min read
Free ToolsP&L Calculation: How to Work Out Trade Profit
How to calculate profit and loss on a trade: the formula for longs and shorts, fees and slippage, leverage, and turning P&L into a percentage return.
Bullynx Editorial Team · Jun 30, 2026 · 8 min read
Free ToolsPip Value Explained: Forex Sizing Made Easy
Pip value explained: what a pip is, the formula to calculate pip value by currency pair and lot size, a worked example, and how it drives position sizing.
Bullynx Editorial Team · Jun 28, 2026 · 6 min read
Free ToolsStock Average Calculator: How to Average Down
A stock average calculator finds your weighted average cost basis. See the formula, a worked averaging-down example, and the risks of lowering it.
Bullynx Editorial Team · Jun 7, 2026 · 6 min read
Free ToolsRisk Reward Ratio Break-Even Win Rate: 1:2 Needs 33%
A 1:2 risk reward ratio needs a 33 percent break-even win rate, 1:3 needs 25 percent. The formula is risk / (risk + reward), plus a free calculator.
Bullynx Editorial Team · Jun 7, 2026 · 8 min read
Free ToolsPosition Size Calculator: Size a Trade by Risk
A position size calculator turns account risk, entry, and stop into an exact share count. See the formula, a worked example, and common pitfalls.
Bullynx Editorial Team · Jun 7, 2026 · 8 min read
Free ToolsCompound Interest in Trading: Formula and Math
How compound interest works in trading and investing: the formula, a worked example, the compounding curve, and why drawdowns hurt compounding the most.
Bullynx Editorial Team · Jun 7, 2026 · 6 min read
The calculator gets you the number. Lynx reads the chart. Upload a chart screenshot and Lynx AI reads the structure and the levels, so the number you just calculated has a setup behind it.
Upload my chartPrepare the screenshot first; analysis runs after account setup and subscription.