Tools
Free tools.
Calculators and reference tools for contact center managers, IT teams, and business phone admins. No sign-up required.
Most contact-center and business-phone math gets done on the back of a napkin or inside a spreadsheet that someone built years ago and nobody fully trusts. These tools are the canonical reference we use internally for the same calculations — published openly because there is no good reason to gate Erlang-C staffing math behind an email-capture form.
Every tool runs in your browser, requires no account, and never logs the inputs you type. Results are exportable, the underlying formula is documented inline, and the source data behind any benchmark we cite is linked to the open VoIP Pricing Research 2026 report or the underlying pricing dataset (CC BY 4.0).
If you want a calculator we have not built yet — three-year TCO modeling against a specific seat count, predictive-dialer pacing math, or local-presence dialing answer-rate projections — email [email protected] with what you need and what the inputs would look like. We typically ship one new tool every quarter based on what teams ask for.
When to reach for each tool
The Erlang C agent staffing calculator answers the most-common contact-center workforce question: how many concurrent agents do you need to hit a target service level (typically 80% of calls answered in 20 seconds) given your forecasted call arrival rate and average handle time? The math behind Erlang C dates to 1917 (telephone exchange queueing theory) and remains the standard reference for inbound staffing. The calculator outputs the agent count along with utilization percentage, average speed of answer, and occupancy — surface these in WFM tools (NICE, Verint, Calabrio, Genesys WFM) or simple shift-plan spreadsheets. The model assumes Poisson-distributed call arrivals and exponentially-distributed handle times, which holds well for inbound queues but is less accurate for outbound dialing (where pacing math is different).
If you are evaluating contact center pricing tiers, complement the Erlang calculator with the three-year TCO calculator which models per-seat cost across 13 SMB-focused VoIP and CCaaS providers. The SMB VoIP Pricing Research 2026 report documents the methodology behind every benchmark; the open CC BY 4.0 dataset exposes the raw figures. The DialPhone contact center pricing page details the four tiers (Standard $65, Professional $95, Elite $145, Enterprise custom) with what each includes.
For specific use-case calculators not yet published — voicemail-handle-time analyzer, predictive-dialer pacing model, call-recording storage forecast, local-presence dialing answer-rate model — email [email protected] with the inputs you want modeled. We ship one new tool roughly every quarter based on user requests. All tools are pure-client-side: inputs are not stored, no analytics fire on form fields, and the underlying formulas are documented inline so any analyst can verify the math.