Technology Calculators
Stack Row calculators answer common pricing, storage, networking, and developer questions in your browser. Each tool shows the formula behind every result, works without an account, and keeps what you enter on your device.
Business Technology
Markup Calculator
Find a selling price from cost and markup, or convert between markup and gross margin.
Open calculatorDeveloper and Data
Binary and Hex Calculator
Convert binary, decimal, hex, and octal, do arithmetic in any base, and check two's complement.
Open calculatorCloud and Infrastructure
RAID Calculator
Work out usable capacity, overhead, and fault tolerance for RAID 0, 1, 5, 6, 10, 50, 60, and JBOD.
Open calculatorCloud and Infrastructure
Download Time Calculator
Estimate transfer time, the speed needed to meet a deadline, or how much data a link can move.
Open calculatorBusiness Technology
ROI Calculator
Calculate ROI, annualized ROI, and payback for an investment or a software project.
Open calculatorSaaS and Startups
ARR and MRR Calculator
Convert MRR and ARR, normalize billing intervals, and measure monthly MRR movement.
Open calculatorBusiness Technology
CPM Calculator
Work out CPM, total ad cost, or impressions, and compare CPM with cost-per-click pricing.
Open calculatorBusiness Technology
ROAS Calculator
Measure return on ad spend and check it against your break-even ROAS.
Open calculatorDeveloper and Data
Statistical Significance Calculator
Test whether an A/B test's difference in conversion rate is statistically significant.
Open calculatorSaaS and Startups
Business Valuation Calculator
Estimate a value range with revenue multiples, earnings multiples, or discounted cash flow.
Open calculatorAI
AI Token Counter and Cost Calculator
Estimate tokens from text and compare API costs across Claude, GPT, and Gemini models.
Open calculator
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How Stack Row Calculators Work
Every calculator follows the same rules, so results are easy to check and reuse.
- Formulas are visible. Each result shows the equation used, and each page explains the method with a worked example.
- Inputs stay private. Calculations run in your browser. A calculation is saved only in this browser, and you can remove it at any time.
- Results are portable. Copy a summary, share a link that recreates the calculation, download a CSV, or print a clean results page.
- Limits are stated. Each page lists its assumptions and what the calculator does not cover.
Calculators provide estimates from the values you enter. Check important decisions against your own records, vendor documentation, or a qualified advisor.