English Calculators
Free calculators with direct answers, clear inputs and the calculation steps behind every result.
Roof Pitch CalculatorConvert rise and run into pitch, degrees and slope percentage. Estimate common rafter length and roof area.Salary to Hourly CalculatorConvert annual, monthly, weekly and hourly gross pay with a schedule that matches your job.Margin CalculatorCalculate profit margin, markup and selling price. Check per-item profit and totals for your quantity.Test Grade CalculatorConvert correct answers, wrong answers or points to a percentage. Choose a letter scale and explore the score chart.Deck Material CalculatorEstimate decking boards, cutting allowance and optional face screws and board cost in imperial or metric units.Ovulation CalculatorEstimate ovulation and fertile dates from your last period and cycle length. Educational calendar estimate.Fraction CalculatorAdd, subtract, multiply or divide fractions and mixed numbers with exact results and clear steps.Percentage CalculatorFind percentages, apply discounts and increases, and compare values with clear formulas.Square Footage CalculatorCalculate room and surface areas in square feet or square meters, with optional waste allowance and material cost.Date Duration CalculatorCount days between dates, weeks and calendar years/months/days, with an optional weekday count.
Calculate, then understand the result
Our English-language calculators work directly in your browser. Enter your values, see the answer and check the formulas below each tool.
Looking for our Brazilian calculators? Visite o SimCálculo em português.