How Much Does Simultaneous Interpretation Cost? ¥30,000–90,000 per Half Day and Cheaper Options (2026)

What Does Simultaneous Interpretation Actually Cost?

The best starting point is the price lists that agencies publish openly. Most agencies grade interpreters into a handful of tiers by subject-matter difficulty and quote separate half-day and full-day rates. Here's what a few agencies had listed as of July 2026.

Simul International's published rates list a half day (up to three hours) at ¥88,000 for its top tier, ¥74,000 for its standard "A" tier, ¥57,000 for "B," and ¥34,000 for "G" (all figures pre-tax, per interpreter). Full-day rates run ¥110,000 for tier A and ¥85,000 for tier B[1]. OCiETe, an interpreter-matching platform, describes rates for specialized, high-difficulty dispatched interpreters starting around ¥65,000–¥70,000 for a half day and ¥90,000–¥100,000 for a full day[2]. Rates vary by agency, but per-interpreter fees for simultaneous work generally fall in this range.

Sources: Simul International published rates[1], OCiETe rate guide[2]. Figures are pre-tax, per interpreter, and vary by agency and subject matter.

The Hidden Costs You Might Be Missing

Budgeting off a single interpreter's rate card is where most estimates go wrong. Simultaneous interpretation carries several costs that stack on top of the number printed in the price list.

Two interpreters is the norm, not the exception

Simultaneous interpreting is mentally exhausting, so interpreters typically rotate every 15–20 minutes, which means agencies book two as standard. Simul International's own terms specify two interpreters for sessions under three hours and three to four for longer ones[1]. In practice, that means even a half-day booking usually doubles the rate-card figure.

Equipment is billed separately

Simultaneous interpretation typically requires a soundproof interpreter booth, a transmitter/mixer control unit, and receivers with earpieces for every attendee, plus a technician to run the audio[3]. Costs scale with venue size and receiver count, and they're billed on top of the interpreters' fees, not included in them. Our simultaneous interpretation equipment guide breaks down what each piece costs.

Minimum booking blocks and travel costs

Even a one-hour request is commonly billed at the half-day rate once the interpreter is booked for two hours or more, and some agencies charge the full-day rate for anything spanning midday. Travel costs, and lodging for events outside the interpreter's home city, are added on top. The shorter the event, the worse this ratio tends to look. For a worked example, see what hiring an interpreter for a one-hour talk actually costs.

Simultaneous vs. Consecutive vs. Whispered Interpretation: How Rates Differ

When you research interpretation rates, the first thing to understand is that the mode of interpreting changes the total. The rate cards above assume simultaneous interpretation, but consecutive and whispered interpreting call for different staffing and equipment, so the total can differ for the same event. The table below sketches each mode qualitatively. Actual figures vary by mode, subject matter, and booking length, so confirm them with an agency quote.

Consecutive interpreting can often be done by one interpreter without heavy equipment, so for the same duration it tends to cost less in total than simultaneous. The trade-off is that the speaker pauses in segments while the interpreter renders each one, which roughly extends the running time. Whispered interpreting has the interpreter render in a low voice next to a small audience; a booth and receivers may not be needed, but sustaining real-time interpreting is just as demanding as simultaneous, so the technical fee tends to track simultaneous rates[2]. Matching the mode to your headcount and format is the first step to keeping costs down within the going rates.

Comparing Ways to Cut Costs

There are broadly three directions to bring the cost down: keep using human simultaneous interpreters but book more carefully, use the translation feature built into a video conferencing app, or use an AI voice translation service. Each fits a different kind of event.

A conferencing app's translation feature assumes everyone joins that same app on the same call — natural for an online meeting, but a heavy lift if you have to get an entire in-person audience to install an app and join a call just to follow a talk. AI voice translation services generally work the other way around: the speaker's device streams the translation out, and attendees pick it up on their own phones. Pricing that starts small and scales with usage tends to fit an event with a few dozen attendees well.

VoxFlight: An Option for Small Events

VoxFlight is a live translation service built for small in-person events. The organizer starts a session from an iPhone and displays a QR code in the room. Attendees scan it with their own phone's browser and follow along with translated captions and translated audio — no app install required on their end.

Pricing below is planned pricing ahead of general availability. Once paid purchase is available, the App Store processes payment when a session pass is purchased; the purchased pass is consumed when translation starts. The table compares one- and two-language passes.

For two target languages, the complete two-language pass is purchased once in the App Store for the same duration and attendee limit. It is not an add-on after buying a one-language pass, and the total is shown before purchase.

VoxFlight is currently in pre-launch preparation. Prices above are planned pricing, and two-language passes are included in the planned launch pricing.

That said, VoxFlight isn't the right fit everywhere. It isn't built for medical or legal interpretation where errors carry real consequences, for large conferences that already run a dedicated interpreter team, or for panel discussions where several people talk at once. For those, paying for human simultaneous interpretation is the right call. But for the many organizers of talks and seminars with a few dozen attendees who have been skipping multilingual support purely because of cost, it's a practical alternative.

Bottom Line

You can't judge simultaneous interpretation costs from a single interpreter's rate card alone. A two-interpreter team, separate equipment costs, and minimum booking rules all stack up, and for small events the total often looks disproportionate to the actual talk time. If accuracy is the priority, human simultaneous interpretation is still the right choice — but for study sessions and meetups, it's worth weighing an AI voice translation service as a way to keep costs down.

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