100 Specialized Calculators

The Tools That
Professionals Actually Use

StackFrame is a curated collection of niche calculators built for legal, logistics, finance, and trade professionals. No fluff, no sign-ups — just precise tools for specific jobs.

Explore Tools Learn More
100
Specialized calculators
8
Professional domains
0
Sign-ups required
100%
Browser-based
Popular This Week
Break-Even ROAS Calculator
Finance & Marketing
Bunker Adjustment Factor (BAF) Calculator
Shipping & Logistics
Debt Payoff Calculator
Personal Finance
Foster Care Legal Cost Estimator
Legal Services
Embodied Carbon in Construction Calculator
Environmental Engineering
Attorney Contingency Fee Calculator
Legal Services
About StackFrame

Built for the Professionals Who Need Precision, Not Approximations

Most online calculators are built for broad consumer audiences — mortgage calculators for homebuyers, basic BMI tools for casual users. StackFrame was built for a different user: professionals who encounter specialized calculation needs as part of their daily work and have never had a dedicated tool for them.

A freight forwarder needing to calculate Bunker Adjustment Factors. A family lawyer estimating foster care legal costs. A sustainability consultant calculating embodied carbon in a construction project. These are real needs — and until now, they required either spreadsheet formulas or expensive proprietary software.

Niche-First Design
Every calculator targets a specific, real professional use case — not a generic category.
Industry Formulas
Tools are built using formulas and standards relevant to each industry, not simplified approximations.
No Paywalls
All 100 tools are available without an account. Open the page, get your answer, move on.
Updated Regularly
New tools added monthly based on professional community requests and industry developments.
Who Uses StackFrame
Legal
Attorneys & Paralegals
Estimate contingency fees, legal aid costs, and court-related expenses for client consultations and case planning.
Logistics
Freight Forwarders & Traders
Calculate BAF surcharges, FCL shipping costs, cross-docking fees, and cargo insurance without spreadsheets.
Finance
Analysts & Business Owners
Model break-even ROAS, debt payoff schedules, dividend taxes, annuity returns, and business valuations.
Trade
Exporters & Importers
Work out export license costs, foreign exchange hedges, letters of credit, and bill of exchange calculations.
Build
Engineers & Contractors
Calculate embodied carbon, ventilation needs, deep-sea mining impacts, and aquarium salt dosage for projects.

What Can You Calculate?

Eight professional domains, 100+ niche tools — all free to use.

01 — Legal Services

Attorneys, Courts & Mediation

Estimate foster care legal costs, attorney contingency fees, FOIA request costs, family law mediation fees, and debt collection statute expiry deadlines. Built for legal professionals briefing clients and planning cases.

8+ tools
02 — Shipping & Logistics

Freight, BAF & Cross-Docking

Calculate Bunker Adjustment Factors, FCL and air cargo costs, CFR freight charges, cross-docking fees, and container load plans. Used by freight forwarders, traders, and logistics coordinators worldwide.

10+ tools
03 — Finance & Accounting

Debt, Taxes & Investments

Model break-even ROAS, debt payoff timelines, dividend taxes, depreciation schedules, annuity returns, and 529 college savings projections. Tools for financial planners, accountants, and analysts.

20+ tools
04 — Business Operations

Marketing, HR & Strategy

Calculate ad spend ROI, ESPP valuations, employee engagement ROI, customer onboarding costs, direct mail campaign returns, and business valuation multiples. Built for operators and growth teams.

15+ tools
05 — Environmental

Carbon, Waste & Sustainability

Estimate embodied carbon in construction, personal food waste impact, charcoal vs. gas grill emissions, climate migration risk, and deep-sea mining environmental impact. For sustainability consultants and ESG teams.

7+ tools
06 — Real Estate & Property

Mortgages, Down Payments & Easements

Calculate balloon mortgage payments, down payment assistance eligibility, easement compensation, dealer invoice price estimates, and fixed vs. variable cost ratios for property investment analysis.

6+ tools

Browse Calculators

A selection from our 100 tools — organized by category.

Break-Even ROAS Calculator
Finance & Accounting
Free →
Bunker Adjustment Factor (BAF) Calculator
Shipping & Logistics
Free →
Debt Payoff Calculator
Personal Finance
Free →
Foster Care Legal Cost Estimator
Legal Services
Free →
Embodied Carbon in Construction Calculator
Environmental Engineering
Free →
Attorney Contingency Fee Calculator
Legal Services
Free →
FCL Shipping Cost Calculator
Shipping & Logistics
Free →
Business Valuation Calculator
Business Operations
Free →
Dividend Tax Calculator
Finance & Accounting
Free →
Air Cargo Cost Calculator
Shipping & Logistics
Free →
Balloon Mortgage Calculator
Real Estate & Property
Free →
Customer Onboarding Cost Calculator
Business Operations
Free →
Foreign Exchange Hedge Calculator
Finance & Accounting
Free →
Cross-Docking Cost Calculator
Shipping & Logistics
Free →
Carbon Dioxide in Homebrew Calculator
Homebrew & Brewing
Free →
App Store Revenue Estimator
Business Operations
Free →
Espresso Shot Volume Calculator
Food & Beverage
Free →
Climate Migration Risk Estimator
Environmental
Free →
Down Payment Assistance Calculator
Real Estate & Property
Free →
Depreciation Calculator
Finance & Accounting
Free →
Ad Spend ROI Calculator
Marketing & Ads
Free →
529 College Savings Calculator
Finance & Accounting
Free →
Aquarium Salt Dosage Calculator
Aquarium & Pet
Free →
Cocktail Ratio Calculator
Food & Beverage
Free →
Food Waste Calculator
Environmental
Free →
Family Law Mediation Cost Estimator
Legal Services
Free →
Debt-to-Equity Ratio Calculator
Finance & Accounting
Free →
Fixed Annuity Return Calculator
Finance & Accounting
Free →
ESPP Calculator
HR & Compensation
Free →
Beer ABV Calculator
Homebrew & Brewing
Free →
Direct Mail Campaign ROI Calculator
Marketing & Ads
Free →
Charcoal vs. Gas Grill Emissions
Environmental
Free →
CFR Freight Calculator
Shipping & Logistics
Free →
FAS Vessel Calculator
Shipping & Logistics
Free →
Freedom of Information Request Cost
Legal Services
Free →
Contractor Tax Calculator
Finance & Accounting
Free →
Account Payable Days Calculator
Finance & Accounting
Free →
Average Collection Period Calculator
Finance & Accounting
Free →
Break-Even Units Calculator
Business Operations
Free →
Cloudflare Bandwidth Savings Calculator
Tech & Infrastructure
Free →
100
Free calculators
8
Professional domains
0
Account required
100%
Browser-based

Frequently Asked Questions

Common questions about StackFrame and how it works.

Yes. Every calculator on StackFrame is completely free to use. There are no premium tiers, no feature restrictions, and no requirement to create an account. All 100 tools are available immediately.
Each calculator was researched and built by people with domain knowledge in that specific field — legal professionals, logistics operators, financial analysts, and engineers contributed to the formulas and use cases behind the tools.
No. All calculations run entirely in your browser. No data is sent to our servers, stored in accounts, or shared with third parties. Your inputs and results are yours alone.
Most calculator sites focus on consumer use cases — generic mortgage calculators, BMI tools, tip calculators. StackFrame targets professional niches: BAF surcharges, legal contingency fees, embodied carbon calculations, cross-docking costs. These are problems professionals encounter daily without dedicated tools.
Yes. New calculators are added regularly based on user requests. If you work in a domain that is not yet covered, contact us with your use case and we will consider it for the next development cycle.
Yes. Finance tools use standard industry formulas — break-even ROAS calculations follow the same logic used by media buyers and analysts, depreciation uses standard declining balance and straight-line methods, and annuity calculations follow standard actuarial formulas.
The calculators are designed to support professional decision-making but are provided as reference tools, not as a substitute for professional advice. For legal, financial, or regulatory decisions, always consult a licensed professional in your jurisdiction.
StackFrame is supported by contextual advertising. We use minimal, non-intrusive ads that are relevant to the calculator you are using. We do not use pop-ups, interstitials, or dark patterns.

Find the Right Tool for Your Job

Browse 100 calculators across 8 professional domains — no sign-up, no cost.

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