---
title: "English Calculators"
type: "page"
canonical_url: "https://simcalculo.com/calculators/"
markdown_url: "https://simcalculo.com/calculators.md"
date_published: "2026-10-19T13:00:07-03:00"
date_modified: "2026-10-20T00:47:05-03:00"
author: ""
language: "pt-BR"
category: ""
summary: "Free calculators with direct answers, clear inputs and the calculation steps behind every result. Roof Pitch Calculator ↗ Convert rise and run into pitch, degrees and slope percentage. Estimate common rafter length and roof area. Calculate roof pitch →Salary to Hourly Calculator ↗ Convert annual,…"
---

# English Calculators

Free calculators with direct answers, clear inputs and the calculation steps behind every result.

[## Roof Pitch Calculator ↗

Convert rise and run into pitch, degrees and slope percentage. Estimate common rafter length and roof area.

**Calculate roof pitch →**](https://simcalculo.com/roof-pitch-calculator/)[## Salary to Hourly Calculator ↗

Convert annual, monthly, weekly and hourly gross pay with a schedule that matches your job.

**Convert salary to hourly →**](https://simcalculo.com/salary-to-hourly-calculator/)[## Margin Calculator ↗

Calculate profit margin, markup and selling price. Check per-item profit and totals for your quantity.

**Calculate margin →**](https://simcalculo.com/margin-calculator/)[## Test Grade Calculator ↗

Convert correct answers, wrong answers or points to a percentage. Choose a letter scale and explore the score chart.

**Calculate test grade →**](https://simcalculo.com/test-grade-calculator/)[## Deck Material Calculator ↗

Estimate decking boards, cutting allowance and optional face screws and board cost in imperial or metric units.

**Estimate deck materials →**](https://simcalculo.com/deck-material-calculator/)[## Ovulation Calculator ↗

Estimate ovulation and fertile dates from your last period and cycle length. Educational calendar estimate.

**Estimate ovulation dates →**](https://simcalculo.com/ovulation-calculator/)[## Fraction Calculator ↗

Add, subtract, multiply or divide fractions and mixed numbers with exact results and clear steps.

**Calculate fractions →**](https://simcalculo.com/fraction-calculator/)[## Percentage Calculator ↗

Find percentages, apply discounts and increases, and compare values with clear formulas.

**Calculate percentages →**](https://simcalculo.com/percentage-calculator/)[## Square Footage Calculator ↗

Calculate room and surface areas in square feet or square meters, with optional waste allowance and material cost.

**Calculate area →**](https://simcalculo.com/square-footage-calculator/)[## Date Duration Calculator ↗

Count days between dates, weeks and calendar years/months/days, with an optional weekday count.

**Calculate duration →**](https://simcalculo.com/date-duration-calculator/)

## 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.](https://simcalculo.com/)