# Ratio

Browse 55 online Ratio tools for working with ratios through your browser. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

> Canonical page: https://elysiatools.com/en/tags/ratio

## Overview

Explore 55 Ratio tools for common ratio-related calculations and workflows. Use the tools in your browser without installing software; processing runs on Elysia Tools servers.

## Frequently asked questions

### What can I do with Ratio tools?

Ratio tools help you perform ratio-related calculations and operations through a browser-based interface.

### Do I need to install software?

No software installation is needed. You can use the Ratio tools from your browser.

### How is my data handled?

Processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Tools

- [AHU Coil Capacity Calculator (Cooling / Heating)](https://elysiatools.com/en/tools/ahu-capacity-calculator): Compute the total, sensible, and latent capacity of an air-handling-unit (AHU) coil from the entering/leaving air state and the dry-air mass flow ṁ_da. Total capacity Qt = ṁ_da·(h1 − h2); sensible capacity Qs = ṁ_da·cp_ma·(T1 − T2) with cp_ma ≈ 1.006 + 1.86·W \[kJ/(kg da·K)\]; latent capacity Ql = Qt − Qs; Sensible Heat Ratio SHR = Qs / Qt. Each state is described by dry-bulb T plus one humidity input (relative humidity φ, or humidity ratio W); W is derived from the Magnus saturation fit when RH is supplied, and enthalpy h = 1.006·T + W·(2501 + 1.86·T) \[kJ/kg da\]. Signed result — works for cooling or heating coils.
- [Audio Channel Mixer](https://elysiatools.com/en/tools/audio-channel-mix): Mix left and right channels into mono with specific ratios
- [Audio Compressor](https://elysiatools.com/en/tools/audio-compressor): Apply dynamic range compression with configurable threshold, ratio, attack/release, and makeup gain
- [Belt Pulley Speed Ratio Calculator](https://elysiatools.com/en/tools/belt-pulley-speed-ratio): Calculate the ratio, driven speed and belt linear speed of a belt drive. i = d₂/d₁ = n₁/n₂, belt speed v = π·d·n/60. Supports mm/cm/m/inch diameter units.
- [Chain Sprocket Ratio Calculator](https://elysiatools.com/en/tools/chain-sprocket-ratio): Calculate the ratio, driven speed and chain linear speed of a chain drive. i = z₂/z₁ = n₁/n₂, chain speed v = z₁·p·n₁/60000. Enter the pitch to compute chain speed.
- [Chrome Web Store Screenshots Resized](https://elysiatools.com/en/tools/chrome-web-store-screenshots-resized): Resize images to Chrome Web Store screenshot dimensions while preserving full content and aspect ratio for extension and app listings
- [Color Contrast Checker](https://elysiatools.com/en/tools/color-contrast-checker): Check color contrast ratio and WCAG compliance for accessibility
- [Column Buckling Load Calculator (Euler)](https://elysiatools.com/en/tools/column-buckling-load): Calculate the Euler critical buckling load of an axially loaded column: P_cr = π²·E·I/(K·L)². Supports pinned-pinned (K=1), fixed-free (K=2), fixed-pinned (K=0.7), fixed-fixed (K=0.5). Returns effective length, radius of gyration, slenderness ratio λ, and critical stress σ_cr.
- [Concrete Mix Design (ACI 211)](https://elysiatools.com/en/tools/concrete-mix-design): Design a normal-weight concrete mix per ACI 211.1-91 absolute-volume method. Inputs: slump, nominal max aggregate size, air entrainment, water-cement ratio w/c, fineness modulus of sand, and dry-rodded coarse-aggregate density. Outputs the per-cubic-meter masses of cement, water, fine and coarse aggregate plus the mass ratio.
- [Cooling Load Calculator (Area / U-value + Infiltration)](https://elysiatools.com/en/tools/cooling-load-calculator): Estimate the cooling load of a room by the simplified ASHRAE steady-state method. Transmission sensible load Q_trans = Σ(A_i·U_i·ΔT) over envelope surfaces entered one per line as 'area,U' (U in W/(m²·K)). Infiltration/ventilation sensible Q_s = 1.23·ACH·V·ΔT and latent Q_l = 3010·ACH·V·ΔW (W), where ΔW is the indoor-outdoor humidity-ratio difference derived from dry-bulb temperature and relative humidity via the Magnus saturation fit. Total cooling load = total sensible + total latent. Temperature in °C/K/°F (only differences matter), area in m²/ft².
- [Data Crosstab Generator](https://elysiatools.com/en/tools/data-crosstab-generator): Advanced crosstab (pivot table) generator that creates powerful cross-tabulation analysis from your data. Perfect for business intelligence, statistical analysis, data exploration, and reporting. Features: - Multiple aggregation functions (sum, count, average, min, max, median) - Flexible row and column grouping - Percentage and ratio calculations - Row/column totals and grand totals - Multi-dimensional analysis - Conditional formatting support - Statistical significance testing - Custom sorting and filtering - Export-ready formatting Common Use Cases: - Sales analysis by region and product - Customer demographics analysis - Financial statement analysis - Survey response analysis - Inventory turnover analysis - Performance metrics tracking
- [Decibel Calculator (Power Ratio, Voltage Ratio, dBm/dBu/dBV)](https://elysiatools.com/en/tools/decibel-calculator): Convert between ratios and decibels (10·log power, 20·log amplitude), and across absolute units dBm/dBW/dBV/dBu/dBFS/SIL
- [Duct Size Calculator (Flow Rate × Velocity)](https://elysiatools.com/en/tools/duct-size-calculator): Size a duct cross-section from the air flow rate Q and the design mean velocity v: area A = Q/v. Circular duct diameter D = √(4A/π). Rectangular duct with aspect ratio r = a/b gives b = √(A/r) and a = r·b, plus the ASHRAE equivalent diameter D_eq = 1.30·(a·b)^0.625/(a+b)^0.25. Flow rate in m³/s/m³/h/CFM, velocity in m/s; dimensions reported in mm and inches.
- [EER ↔ SEER ↔ COP Converter (Refrigeration Efficiency)](https://elysiatools.com/en/tools/eer-seer-converter): Convert between the three common refrigeration efficiency metrics: COP (dimensionless, W/W), EER (Btu/(W·h)), and SEER (seasonal Btu/(W·h)). Standard relations: COP = EER / 3.412, EER = COP × 3.412, SEER = EER / α (α seasonal weighting factor, default 0.875, adjustable 0.8–0.91 to match regional standards such as ARI 210/240). Enter any one metric and all three are reported.
- [F Distribution Calculator](https://elysiatools.com/en/tools/f-distribution-calculator): Calculate F distribution density, cumulative probability, and right-tail probability from numerator and denominator degrees of freedom
- [Fertilizer N-P-K Blend Calculator](https://elysiatools.com/en/tools/fertilizer-blend-calculator): Compute how to mix base fertilizers to hit a target N-P-K analysis like 10-10-10. Outputs per-fertilizer kg plus a parts ratio for any batch size.
- [Fibonacci Sequence Generator](https://elysiatools.com/en/tools/fibonacci-generator): Generate Fibonacci sequence with customizable start numbers, length, and output format. Includes golden ratio analysis and mathematical properties.
- [Fraction Decimal Converter](https://elysiatools.com/en/tools/fraction-decimal-converter): Convert between fractions and decimals with support for mixed numbers, improper fractions, and various decimal formats
- [Gear Ratio Calculator](https://elysiatools.com/en/tools/gear-ratio-calculator): Calculate the gear ratio and output speed of a meshing gear pair. i = z₂/z₁ = n₁/n₂. Enter the tooth counts to get the ratio; add the driver speed to get the driven speed.
- [Gear Train Speed Ratio Calculator](https://elysiatools.com/en/tools/gear-train-speed-ratio): Calculate the overall ratio and output speed of a multi-stage gear train. i_total = i₁·i₂·…·iₙ (each i = z₂/z₁). Enter tooth pairs per stage and the input speed to get the final output speed.
- [Geometric Mean Calculator](https://elysiatools.com/en/tools/geometric-mean-calculator): Calculate the geometric mean of positive numeric values for growth rates, ratios, and multiplicative datasets
- [Geometric Sequence Calculator](https://elysiatools.com/en/tools/geometric-sequence-calculator): Calculate the nth term, first terms, and finite sum of a geometric sequence
- [Batch Image Crop](https://elysiatools.com/en/tools/image-batch-crop): Batch crop multiple images to specific dimensions or aspect ratios with custom positioning. Returns cropped images as a ZIP download.
- [Image Cropper](https://elysiatools.com/en/tools/image-cropper): Crop images to specific dimensions or aspect ratios with custom positioning

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