Useful tools
Interactive planning calculators from Useful Atlas. Estimate scenarios, compare options, and use the results as a starting point before speaking with a professional.
Compare renting and buying with mortgage costs, invested cash, home equity, rent growth, and a break-even estimate.
Open calculatorConvert money between years with official CPI-U data from 1913 to the latest embedded BLS CPI value.
Open calculatorEstimate a financial independence number, years to FIRE, target date, and monthly savings gap from editable assumptions.
Open calculatorTools for API spend, local AI planning, automation tradeoffs, and model selection decisions.
AI and automation
NewEstimate AI API spend from input tokens, output tokens, request volume, token prices, cached-input discounts, and monthly usage assumptions.
Pair it with the automation planning path before an agent workflow reaches real traffic. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewCompare ChatGPT Plus, API usage, and local AI monthly cost from messages, tokens, cached-input share, hardware, and electricity assumptions.
Use it before choosing between a ChatGPT subscription, API billing, or a local model setup. Read guide: Self-Host n8n or Dify: Cost and Privacy Tradeoffs
Open calculatorAI and automation
NewCompare AI image and video generation costs across Midjourney plans, Runway credits, Google Vertex AI rates, and manual visual API assumptions.
Use it before a creative AI workflow turns into credit, GPU-hour, or per-second spend. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate annual AI energy, carbon, and water footprint from prompt volume, query profile, carbon intensity, and data-center water assumptions.
Use it before sustained prompt volume becomes an infrastructure, carbon, or water planning question. Read guide: Self-Host n8n or Dify: Cost and Privacy Tradeoffs
Open calculatorAI and automation
NewCheck whether a computer can run a specific local AI model from GPU VRAM, RAM, model size, quantization, KV cache, context length, and active sessions.
Use it before buying RAM, GPU VRAM, or a new machine for local model work. Read guide: What PC Should You Buy for Local AI Models in 2026?
Open calculatorAI and automation
NewCompare AI API token spend with local hardware, power, maintenance, resale, and 1-year and 3-year total cost of ownership.
Read the self-hosting path before moving spend from API calls into hardware. Read guide: Self-Host n8n or Dify: Cost and Privacy Tradeoffs
Open calculatorAI and automation
NewSize a VPS for n8n, Dify, or Open WebUI from users, workload, storage, backups, database cost, GPU host cost, and monthly run rate.
Use it with the self-hosting path before choosing a VPS, database, or GPU host. Read guide: Self-Host n8n or Dify: Cost and Privacy Tradeoffs
Open calculatorAI and automation
NewEstimate hours saved, labor value, monthly net benefit, payback, and 12-month ROI for n8n, Make, Zapier, or AI automations.
Screen the workflow before choosing n8n, Make, Zapier, Dify, or custom code. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate workflow runs, Zapier tasks, Make credits, n8n executions, plan fit, utilization, and monthly automation platform cost.
Use it before a workflow reaches real task, credit, or execution volume. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewPlan API throughput from RPM, TPM, request size, batch size, retries, latency, concurrency, and safety buffer.
Use it before API traffic hits RPM, TPM, retry, or worker-concurrency throttling. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate monthly and annual electricity cost for a home server, NAS, mini PC, or GPU box from idle watts, active watts, runtime, and electricity rate.
Use it before leaving a home server, NAS, mini PC, or GPU box on all month. Read guide: Self-Host n8n or Dify: Cost and Privacy Tradeoffs
Open calculatorAI and automation
NewChoose a GPU for local AI from budget, model size, quantization, context length, active sessions, VRAM needs, power draw, and editable prices.
Use it before buying a GPU for local model size, context length, and VRAM needs. Read guide: What PC Should You Buy for Local AI Models in 2026?
Open calculatorAI and automation
NewEstimate AI agent implementation hours, build cost, monthly API spend, platform cost, hosting, maintenance, and first-month total.
Use it before committing engineering time, API budget, maintenance, and platform spend to an agent workflow. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewCompare prompt engineering, RAG, and fine-tuning from knowledge needs, freshness, examples, setup effort, monthly tokens, storage, and first-month cost.
Use it before choosing prompt engineering, RAG, or fine-tuning as the model-optimization path. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate how many AI-generated words, pages, text requests, output tokens, and GPT-Image-2 images a fixed budget can buy.
Use it when the budget is fixed and the question is how many words, pages, or images it can buy. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate token count, context-window fit, per-request cost, and monthly AI API spend from model prices, output tokens, and request volume.
Check prompt size and request cost before scaling a chat, RAG, or agent workflow. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate RAG chunk count, embedding tokens, one-time embedding cost, monthly refresh cost, vector storage, and retrieved context size.
Use it before indexing a knowledge base so chunk count, embedding cost, and vector storage are visible. Read guide: AI Agent Builders Compared: n8n, Dify, Make, Zapier
Open calculatorAI and automation
NewEstimate recommended power supply wattage for local AI PCs and multi-GPU builds from GPU TGP, CPU watts, accessories, transient reserve, and load target.
Use it before buying a PSU for a local AI PC, workstation, or multi-GPU experiment. Read guide: What PC Should You Buy for Local AI Models in 2026?
Open calculatorAI and automation
NewEstimate which tasks in a role are most exposed to AI, compare at-risk and safer task buckets, and get practical skills to learn next.
Open calculatorMaterial, quote, and household project planning tools.
Home planning
NewEstimate a monthly home maintenance reserve, annual routine cost range, known repair set-aside, emergency cushion, and top risk drivers.
Open calculatorQuote
Compare contractor and home-service quotes by total cost, missing scope details, warranty, insurance, cleanup, and change-order risk.
Open calculatorHome projects
NewEstimate paintable area, primer and paint gallons, supply cost, labor hours, and a practical planning total for an interior painting project.
Open calculatorHome projects
NewCalculate square footage for rooms, walls, floors, ceilings, patios, and project areas with waste buffer and quick material planning.
Open calculatorHome projects
NewEstimate flooring area, waste, boxes or cartons, material cost, underlayment, trim, and a realistic planning total before comparing quotes.
Open calculatorHome projects
NewEstimate mulch, soil, compost, gravel, or sand volume from area and depth, then compare bags, bulk yards, cubic meters, and material cost.
Open calculatorHome projects
NewEstimate fence posts, panels, rails, pickets, gates, concrete, material cost, and a practical project planning range.
Open calculatorHome projects
NewEstimate tile area, tile count, boxes, waste, thinset, grout, and material cost for floors, walls, kitchens, and bathrooms.
Open calculatorHome projects
NewEstimate concrete volume, bags, bulk yards or cubic meters, material cost, and waste buffer for slabs, pads, patios, and small pours.
Open calculatorHome projects
NewEstimate drywall sheets, wall and ceiling area, screws, tape, joint compound, waste, and material cost for room remodel planning.
Open calculatorHome projects
NewEstimate roof area, squares, shingle bundles, underlayment rolls, waste, and material cost from footprint, pitch, and roof sections.
Open calculatorHome projects
NewEstimate pool water volume, fill time, water cost, and turnover planning from pool shape, dimensions, depth, and fill rate.
Open calculatorSolar
Estimate solar production, battery impact, grid imports, exports, and rough yearly savings from a few simple inputs.
Open calculatorTools for recurring costs, moves, storage, and everyday planning.
Moving
NewEstimate moving boxes, packing volume, truck space, storage unit fit, and packing supply cost from rooms, people, and home size.
Open calculatorMoving
NewEstimate storage volume, unit size fit, aisle space, and packing density from boxes, furniture, rooms, and home size.
Open calculatorLiving costs
Build a monthly living-cost snapshot with custom expense rows, household income, savings potential, category totals, CSV export, and a printable household report.
Open calculatorLiving costs
NewAudit recurring subscriptions by monthly cost, annual cost, cost per use, low-use candidates, workdays, and cancellation savings.
Open calculatorLiving costs
NewCompare salary buying power between US metro areas using 2024 BEA Regional Price Parities, target offers, and custom RPP values.
Open calculatorLiving costs
NewConvert salary into true hourly pay after unpaid work time, commute time, recurring work costs, and an entered tax-rate assumption.
Open calculatorLiving costs
NewCalculate the hourly freelance or contractor rate you need from target income, benefits, expenses, taxes, time off, and billable utilization.
Open calculatorLiving costs
NewCompare PPP-adjusted annual income per adult with WID.world global income thresholds and estimate a rough global income percentile.
Open calculatorLiving costs
NewEstimate a US household net worth percentile by age group using Federal Reserve 2022 Survey of Consumer Finances thresholds.
Open calculatorLiving costs
NewEstimate what a recurring small purchase could become if redirected into monthly savings with editable return, inflation, and time assumptions.
Open calculatorLiving costs
NewEstimate when invested assets could reach $1,000,000 or another target from current savings, monthly contributions, return, inflation, and contribution growth.
Open calculatorLiving costs
NewEstimate a financial independence number, years to FIRE, target date, and monthly savings gap from editable assumptions.
Open calculatorLiving costs
NewConvert money between years with official CPI-U data from 1913 to the latest embedded BLS CPI value.
Open calculatorLiving costs
NewCompare renting and buying with mortgage costs, invested cash, home equity, rent growth, and a break-even estimate.
Open calculatorFast calculators for common math, unit, and calendar questions.
Everyday utility
NewConvert length, area, volume, weight, and temperature between common US and metric units with copyable results.
Open calculatorEveryday utility
NewCalculate DIM weight, billable shipping weight, volume, density, and package weight risk for UPS, FedEx, and custom carrier divisors.
Open calculatorEveryday utility
NewCalculate printable photo size, effective PPI, required pixels, megapixels, bleed pixels, and crop risk for common print sizes.
Open calculatorEveryday utility
NewScale recipe ingredients by servings or pan area, compare 9x13 to 8x8 pans, and estimate bake-time changes from batter depth.
Open calculatorEveryday utility
NewEstimate password entropy, offline crack time, online throttling risk, and safer next steps locally in your browser.
Open calculatorEveryday math
Calculate percent of a number, percentage change, percent difference, discounts, markups, and reverse percentages without spreadsheet setup.
Open calculatorTime and dates
Count days between dates, see weeks and weekdays, add or subtract time, and calculate precise time duration between two timestamps.
Open calculatorTime and dates
NewPaste a script and estimate speaking time from word count, words per minute, pauses, slide transitions, and timing buffer.
Open calculatorTime and dates
NewSee completed weeks, remaining weeks, percent used, focus-hour budget, and a shareable life week-grid from dates and target age.
Open calculatorEveryday utility
NewTurn daily screen time into annual days, remaining lifetime days, workweeks, percent of remaining time, and reclaimable days.
Open calculatorEveryday utility
NewEstimate a dog age in human-equivalent years from dog age, adult weight, and breed-size group, with life-stage and senior-age context.
Open calculatorEveryday utility
NewPredict 5K, 10K, half marathon, and marathon finish times from a recent race with Riegel formula pace and split estimates.
Open calculatorEveryday utility
NewFind bedtime or wake-up times from sleep cycles, sleep latency, and an editable 90-minute cycle planning assumption.
Open calculator